P.42C-14 - Evo X Service Manuals

P.42C-14 - Evo X Service Manuals
42C-1
GROUP 42C
WIRELESS
CONTROL MODULE
(WCM)
CONTENTS
GENERAL INFORMATION. . . . . . . .
42C-2
SERVICE SPECIFICATIONS. . . . . . .
42C-4
SPECIAL TOOL . . . . . . . . . . . . . . . . .
42C-5
DIAGNOSIS . . . . . . . . . . . . . . . . . . . .
42C-6
ON-VEHICLE SERVICE . . . . . . . . . . . 42C-114
ID CODES REGISTRATION PROCEDURE 42C-114
TPMS TRANSMITTER CHECK. . . . . . . . . . 42C-125
TPMS TRANSMITTER ID CHECK . . . . . . . 42C-125
KEYLESS ENTRY SYSTEM CHECK . . . . . 42C-125
INSPECTION OF KEYLESS ENTRY TIMER
LOCK FUNCTION . . . . . . . . . . . . . . . . . . . . 42C-125
STANDARD FLOW OF DIAGNOSTIC
TROUBLESHOOTING . . . . . . . . . . . . . . . .
42C-6
CUSTOMIZATION FUNCTION . . . . . . . . . . 42C-126
DIAGNOSTIC FUNCTION . . . . . . . . . . . . .
42C-6
ID CODES REGISTRATION JUDGMENT
TABLE. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
42C-9
WARNINGS/ALARMS. . . . . . . . . . . . . . . . .
42C-12
TRANSMITTER. . . . . . . . . . . . . . . . . . 42C-129
DIAGNOSTIC TROUBLE CODE CHART . .
42C-14
DIAGNOSTIC TROUBLE CODE
PROCEDURES. . . . . . . . . . . . . . . . . . . . . .
DISASSEMBLY AND ASSEMBLY . . . . . . . 42C-129
42C-16
DATA LIST REFERENCE TABLE . . . . . . .
42C-83
TROUBLE SYMPTOM CHART. . . . . . . . . .
42C-84
SYMPTOM PROCEDURES . . . . . . . . . . . .
42C-85
INPUT SIGNAL REFERENCE TABLE . . . . 42C-111
INPUT SIGNAL PROCEDURES. . . . . . . . . 42C-111
CHECK AT ECU TERMINALS . . . . . . . . . . 42C-113
WCM . . . . . . . . . . . . . . . . . . . . . . . . . . 42C-128
REMOVAL AND INSTALLATION . . . . . . . . 42C-128
INSPECTION. . . . . . . . . . . . . . . . . . . . . . . . 42C-130
TPMS TRANSMITTER . . . . . . . . . . . . 42C-131
REMOVAL AND INSTALLATION . . . . . . . . 42C-131
RECEIVER ANTENNA ASSEMBLY. . 42C-137
REMOVAL AND INSTALLATION . . . . . . . . 42C-137
42C-2
WIRELESS CONTROL MODULE (WCM)
GENERAL INFORMATION
GENERAL INFORMATION
The wireless control module (WCM) is a system that
integrates the keyless entry function, with which
remote operation (opening/closing of all doors, opening of trunk lid, and operation of warning function that
warns a person who intends to damage the vehicle
*), can be performed by operating the lock/unlock
button, trunk lid button or panic button on the ignition
key (transmitter). Also, WCM incorporates the immobilizer function, which prohibits the starting of engine
using an unauthorized key, and the tire pressure
monitoring system (TPMS), which issues a warning
to a driver by illuminating or flashing the warning light
if an abnormality to the tire pressure or the system
error is detected. WCM has the following features:
M1427500100061
• The ignition key has an indicator light that
enables the driver to check if the signal is transmitted correctly or if the battery in the key is discharged.
• Each vehicle is provided with two ignition keys,
and up to eight ignition keys can be registered.
• Settings of the keyless entry function can be
adjusted using a customization function.
NOTE: *: Horn sounds, and headlights and taillights
flash.
.
CONSTRUCTION DIAGRAM
Multi information display
(Built in combination meter)
TPMS
warning light
Ignition key
Panic button
Trunk lid button
Lock button
LOW
TIRE PRESSURE
Indicator light
Unlock button
Reciever antenna assembly
ASC-ECU
TPMS transmitter
(Tire pressure sensor)
WCM
ETACS-ECU
ECM
TPMS transmitter
(Tire pressure sensor)
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AC709254AB
WIRELESS CONTROL MODULE (WCM)
GENERAL INFORMATION
42C-3
.
Main components and functions
Parts name
Functional description
WCM
Controls the keyless entry functions, TPMS functions and starting of the engine
by using the following communications.
• Communications with ETACS-ECU, ECM, ASC-ECU and combination
meter via CAN
• Wireless communication with the ignition key (transponder)
• Wireless communication with the ignition key (transmitter) via the receiver
antenna assembly
Reciever antenna
assembly
Receives the operation signals from the lock/unlock buttons, trunk lid button,
and panic button on the ignition key (transmitter) as well as the tire pressure
signal from the TPMS transmitter. Then, transmits them to WCM.
Ignition key
The ignition key also sends signals to reciever antenna assembly when the
lock/unlock/trunk lid button and the panic button on it are operated.
Combination meter (Multi Communicates with WCM via CAN. Send ignition switch status. Receives the
information display, TPMS warning request or warning information about TPMS from WCM, activates* the
warning light)
TPMS warning iight. Warning symbol and message is additionally displayed on
the multi information display.
ETACS-ECU
Communicates with WCM via CAN. By the door lock/unlock request, trunk lid
open request, or panic alarm request from WCM, ETACS-ECU outputs the
lock/unlock signal, trunk lid open signal, or panic alarm signal. When the door
lock/unlock signal is output, ETACS-ECU flashes or illuminates the turn signal
light and dome light to notify that the lock/unlock operation is performed.
ASC-ECU
Communicates with WCM via CAN. Sends the vehicle speed data.
ECM
Communication with WCM via CAN. Send atmospheric pressure data..
TPMS transmitter
Measure tire pressure directly, then send radio frequency signal to receiver
antenna assembly.
NOTE: .
• *: Illuminates for tire pressure warning.
• *: Flashes for about 1 minute and then continuously illuminated for TPMS malfunction warning.
.
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42C-4
WIRELESS CONTROL MODULE (WCM)
SERVICE SPECIFICATIONS
System configuration
Ignition key
Panic button
TPMS transmitter
Trunk lid button
Lock button
Indicator light
Unlock button
Radio
frequency
signal (transmittter)
Radio
frequency
signal
(transmitter)
Rear tire (LH)
Rear tire (RH)
Antenna
Pressure
sensor
Battery
Dome light,
Ignition key cylinder
illumination light
Acc.
sensor
Head light,
Tail light
Radio
frequency
signal
(transponder)
Front tire (RH)
Transmission
circuit
CPU
Reciever antenna
assembly
Front tire (LH)
CAN-B
communication
Horn
Door lock actuator
ETACS-ECU
Trunk lid latch
Wireless control module
(WCM)
CAN-C communication
Turn-signal light
ECM
ASC-ECU
Combination meter
(Multi information display,
TPMS warning light)
AC709230AB
NOTE: In case of replacement of WCM, all keyless
ID, key ID and tire pressure sensor ID should be
re-registered using scan tool MB991958 (M.U.T.-III
sub-assembly).
SERVICE SPECIFICATIONS
Item
Standard value
Voltage of transmitter battery (V)
2.5 ~ 3.2
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M1427501500028
WIRELESS CONTROL MODULE (WCM)
SPECIAL TOOL
SPECIAL TOOL
Tool
a
MB991824
b
MB991827
c
MB991910
d
DO NOT USE
MB991911
e
DO NOT USE
MB991914
f
MB991825
g
Tool number and
name
Supersession
MB991958
a. MB991824
b. MB991827
c. MB991910
d. MB991911
e. MB991914
f. MB991825
g. MB991826
M.U.T.-III sub
assembly
a. Vehicle
communication
interface (V.C.I.)
b. M.U.T.-III USB
cable
c. M.U.T.-III main
harness A
(Vehicles with
CAN
communication
system)
d. M.U.T.-III main
harness B
(Vehicles without
CAN
communication
system)
e. M.U.T.-III main
harness C (for
Daimler Chrysler
models only)
f. M.U.T.-III
measurement
adapter
g. M.U.T.-III trigger
harness
MB991824-KIT
NOTE: G: MB991826
M.U.T.-III Trigger
Harness is not
necessary when
pushing V.C.I. ENTER
key.
MB991826
MB991958
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42C-5
M1427501300024
Application
CAUTION
M.U.T.-III main harness A
(MB991910) should be used.
M.U.T.-III main harness B and C
should not be used for this
vehicle.
ETACS-ECU check (Diagnostic
trouble code, service data)
42C-6
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
Tool
a
b
c
d
Tool number and
name
Supersession
Application
MB991223
a. MB991219
b. MB991220
c. MB991221
d. MB991222
Harness set
a. Test harness
b. LED harness
c. LED harness
adaptor
d. Probe
General service tools
Continuity check and voltage
measurement at harness wire or
connector for loose, corroded or
damaged terminals, or terminals
pushed back in the connector.
a. Connector pin contact
pressure inspection
b. Power circuit inspection
c. Power circuit inspection
d. Commercial tester connection
MB992006
Extra fine probe
−
Making voltage and resistance
measurement during
troubleshooting
DO NOT USE
MB991223BA
MB992006
DIAGNOSIS
STANDARD FLOW OF DIAGNOSTIC
TROUBLESHOOTING
M1427504600035
Refer to GROUP 00 −How to Use Troubleshooting/Inspection
Service Points, Contents of Troubleshooting P.00-7.
DIAGNOSTIC FUNCTION
M1427501400032
HOW TO CONNECT THE SCAN TOOL (M.U.T.-III)
Required Special Tools:
• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: M.U.T.-III USB Cable
• MB991910: M.U.T.-III Main Harness A
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WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
Data link connector
MB991910
MB991824
MB991827
AC608435 AB
42C-7
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
1. Ensure that the ignition switch is at the "LOCK" (OFF)
position.
2. Start up the personal computer.
3. Connect special tool MB991827 to special tool MB991824
and the personal computer.
4. Connect special tool MB991910 to special tool MB991824.
5. Connect special tool MB991910 to the data link connector.
6. Turn the power switch of special tool MB991824 to the "ON"
position.
NOTE: When special tool MB991824 is energized, special
tool MB991824 indicator light will be illuminated in a green
color.
7. Start the M.U.T.-III system on the personal computer.
NOTE: Disconnecting scan tool MB991958 is the reverse of the
connecting sequence, making sure that the ignition switch is at
the "LOCK" (OFF) position.
HOW TO READ AND ERASE DIAGNOSTIC
TROUBLE CODES
Required Special Tools:
• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: M.U.T.-III USB Cable
• MB991910: M.U.T.-III Main Harness A
NOTE: If the battery voltage is low, diagnostic trouble codes will
not be set. Check the battery if scan tool MB991958 does not
display.
1. Connect scan tool MB991958 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Select "System select" from the start-up screen.
4. Select "From 2006 MY" of "Model Year." When the "Vehicle
Information" is displayed, check the contents.
5. Select "ETACS" from "System List", and press the "OK"
button.
NOTE: When the "Loading Option Setup" list is displayed,
check the applicable item.
6. Select "Diagnostic Trouble Code."
7. If a DTC is set, it is shown.
8. Choose "Erase DTCs" to erase the DTC.
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42C-8
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
HOW TO DIAGNOSE THE CAN BUS LINES
Required Special Tools:
• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: M.U.T.-III USB Cable
• MB991910: M.U.T.-III Main Harness A
1. Connect scan tool MB991958 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Select "CAN bus diagnosis" from the start-up screen.
4. When the vehicle information is displayed, confirm that it
matches the vehicle being diagnosed.
• If they match, go to step 8.
• If not, go to step 5.
5. Select the "view vehicle information" button.
6. Enter the vehicle information and select the "OK" button.
7. When the vehicle information is displayed, confirm again
that it matches the vehicle being diagnosed.
• If they match, go to step 8.
• If not, go to step 5.
8. Select the "OK" button.
9. When the optional equipment screen is displayed, choose
the one which the vehicle is fitted with, and then select the
"OK" button.
CHECK OF FREEZE FRAME DATA
The freeze frame data can be checked by using scan
tool MB991958 (M.U.T.-III sub assembly).
.
When detecting fault and storing the diagnosis code,
the ECU connected to CAN bus line obtains the data
before the determination of the diagnosis code and
the data when the diagnosis code is determined, and
then stores the ECU status of that time. By analysing
each data from scan tool MB991958 (M.U.T.-III sub
assembly), the troubleshooting can be performed
more efficiently. The displayed items are as the table
below.
Display item list
Item No.
Item name
Data item
Unit
1
Odometer
Total driving distance after the diagnosis code
is generated
km
2
Ignition cycle
Number of times the ignition switch is turned
"ON" or "LOCK (OFF)" after the past failure
transition
Number of counts
is displayed.
4
Accumulated minute
Cumulative time for current malfunction of
diagnosis code
min
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WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
ID CODES REGISTRATION JUDGMENT TABLE
42C-9
M1427504400224
NOTE: Up to eight ignition keys (key ID and keyless
CAUTION
entry
secret code) can be stored in the memory of
Do not replace the engine control module (ECM)
WCM.
and WCM at the same time. When replacing several ECUs, always replace one ECU at a time, register the necessary IDs in it, and then replace the
next ECU.
The transponder (a small transmitter) in the ignition
key, WCM, and the ECM have their own ID codes
stored in them. When the cases listed in the table
below occur, the ID codes must be registered in the
WCM or ECM again.
Item
Operation contents and procedure Reference page for registration
contents
When the engine control
module is replaced.
1. Registration of ENG key code.
2. VIN programmed.
ENG key code & VIN reg (Refer to
GROUP 00 −Precautions before
Service −How to Perform VIN
Writing P.00-27).
When WCM is replaced
1. VIN programmed
2. Register all the key IDs of the
ignition keys again.
3. Register all the keyless IDs of the
ignition keys again.
4. Register the TPMS transmitters
• Write the VIN (Refer to GROUP
00 −Precautions before Service
−How to Perform VIN Writing
P.00-27).
• Key Registration, Keyless ID
Registration and TPMS
transmitter ID registration (Refer
to P.42C-114).
When the receiver antenna
assembly is replaced.
Operation is not needed.
−
When the ignition key is added
as a single unit
1. Register all the key IDs of the
ignition keys again.
2. Register all the keyless IDs of the
ignition keys again.
Key Registration and Keyless ID
Registration (Refer to P.42C-114).
When the ignition key is lost as
a single unit
1. Register all the key IDs of ignition
keys other than the lost one again.
2. Register all the keyless IDs of
ignition keys other than the lost one
again.
When the ignition key is
1. Register the key ID of the replaced Key Registration (Barcode No.)
replaced by the full service key
and Keyless ID Registration (Refer
ignition key again. <Barcode No.
set or the handle lock service
to P.42C-114)
input>
key set is replaced by the piece. 2. Register the keyless ID for all the
ignition keys again.
When the key* is replaced by
the door service key set is
added by the piece.
Operation is not needed
−
When TPMS transmitter is
replaced
Register the TPMS transmitters
TPMS transmitter ID registration
(Refer to P.42C-114).
NOTE: *: Key (the key that can be used to
lock/unlock the door or trunk lid only)
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42C-10
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
SUPPLY UNIT LIST FOR INDIVIDUAL KEY
Ignition key
AC609713
KEY SUPPLY UNIT LIST FOR OTHER THAN INDIVIDUAL KEY
Full service key set
Handle lock service key set
AC609714
AC709684
Door service key set
NOTE: Key (It is the key that comes with the door
service key set. It can only be used for locking
and unlocking, and it cannot start the engine.)
AC607881
AC610062
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42C-11
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
Registration flow chart
Start of registration
YES
Caution:
Do not replace the ECM and the WCM simultaneously.
Always replace the ECU by ones when the multiple ECU is
replaced, and then replace the next ECU after registering
the necessary IDs.
ECM is replaced.
1. Registration of
ENG key code.
NO
2. Registration of VIN.
WCM is replaced.
YES
NO
3. Registration of VIN.
Ignition key is
replaced or added
(or lost).
NO
YES
Ignition key is
replaced by the full
service key set or by the handle
lock service key set
separately.
YES
NO
4. Registration of key ID
(every one code)
4. Registration of
key ID (Barcode No.)
5. Registration of keyless ID
TPMS transmitter
is replaced.
YES
NO
End of registration
NOTE
*: When WCM or TPMS transmitter is replaced.
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6. Registration of tire
pressure sensor ID*
AC709689AB
42C-12
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
WARNINGS/ALARMS
If the TPMS fails or the tire pressure is low, the WCM
warns the driver of that state by the TPMS warning
light and the multi information display in the combination meter.
Display
Item
State
Warning operations
contents
TPMS
Multi
warning light information
display
Not displayed TPMS warning light The ignition
bulb open circuit
switch is
check
turned from
"LOCK"
(OFF) to
"ON."
a
LOW
TIRE PRESSURE
AC610119 AB
Illuminates for −
3 seconds.
Tire pressure alarm The received Illuminates.
tire pressure
value is
under the
alarm ON
threshold
value.
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Symbol and
"LOW TIRE
PRESSURE"
is displayed.
M1427508800020
Warning
cancellation
conditions (Cancels
warning operations
when one of the
conditions met)
3 seconds have
passed after the
TPMS warning light is
lit.
The received tire
pressure value is
over the alarm OFF
threshold value.
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
Display
contents
b
SERVICE
REQUIRED
AC610120AB
Item
State
Warning operations
TPMS
Multi
warning light information
display
TPMS ID not
failure stored
warning
The TPMS
Flashes *
transmitter ID
is not
registered in
the WCM.
Defective
EEPROM
Abnormality
of data in the
EEPROM of
the WCM is
detected.
42C-13
Warning
cancellation
conditions (Cancels
warning operations
when one of the
conditions met)
Symbol and
ID is registered
"SERVICE
normally.
REQUIRED" is
displayed.
Data in the EEPROM
of the WCM is
checked to be
normal.
Problem in The signals
signal
from TPMS
reception transmitters
cannot be
received
while driving
for about 20
minutes.
The signal from the
TPMS transmitter
that was warned is
received.
Defective
sensor
The sensor
failure signal
is received
from the
TPMS
transmitter.
A normal signal is
received from the
TPMS transmitter
that was warned.
The
battery
voltage of
the TPMS
transmitter
is low.
The
reception
problem
warning is
activated
because of
the low
battery
voltage of the
TPMS
transmitter.
The signal of normal
battery voltage is
received from the
TPMS transmitter
that was warned.
Vehicle
speed
input
problem
The vehicle
speed is not
input.
The vehicle speed is
input.
Abnormal
vehicle
speed
value
The vehicle
speed value
is abnormal.
The normal vehicle
speed value is
received.
NOTE: *: Change to continuous illumination after
flashing for about 1 minute.
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42C-14
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
DIAGNOSTIC TROUBLE CODE CHART
M1427500200198
CAUTION
During diagnosis, a DTC associated with other system may be set when the ignition switch is turned
on with connector(s) disconnected. On completion, confirm all systems for DTC(s). If DTC(s) are set,
erase them all.
Diagnostic trouble code
number
Diagnostic item
Reference
page
B1731
Engine control module communication timeout
P.42C-16
B1761
VIN code not programmed
P.42C-18
B1A08
Keyless/KOS key1 performance
P.42C-19
B1A09
Keyless/KOS key2 performance
B1A0A
Keyless/KOS key3 performance
B1A0B
Keyless/KOS key4 performance
B1A0C
Keyless key 5 performance
B1A0D
Keyless key 6 performance
B1A0E
Keyless key 7 performance
B1A0F
Keyless key 8 performance
B1A10
Keyless/KOS key 1 low battery
B1A11
Keyless/KOS key 2 low battery
B1A12
Keyless/KOS key 3 low battery
B1A13
Keyless/KOS key 4 low battery
B1A14
Keyless key 5 low battery
B1A15
Keyless key 6 low battery
B1A16
Keyless key 7 low battery
B1A17
Keyless key 8 low battery
B1A24
Key ID not registered
P.42C-22
B1A25
Key ID unmatched
P.42C-23
B1A28
Engine control module authenticate error
P.42C-25
B1A35
Transponder read error
P.42C-27
B2101
IG SW start POS.circuit low
P.42C-30
B2102
IG SW start POS.circuit high
B2204
Coding data mismatch
P.42C-33
B2206
VIN code mismatch
P.42C-35
B2352
Antenna fail
P.42C-37
B2401
Keyless/KOS key ID not register
P.42C-22
B2415
RA module power voltage
P.42C-39
B2416
ECU internal error
P.42C-44
C1608
EEPROM error
P.42C-45
C1900
No registration
P.42B-131
C1901
Vehicle speed information abnormality
P.42B-132
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P.42C-21
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
42C-15
Diagnostic trouble code
number
Diagnostic item
Reference
page
C1910
Transmitter low battery voltage abnormality 1
P.42C-49
C1920
Transmitter low battery voltage abnormality 2
C1930
Transmitter low battery voltage abnormality 3
C1940
Transmitter low battery voltage abnormality 4
C1911
Reception abnormality 1
C1921
Reception abnormality 2
C1931
Reception abnormality 3
C1941
Reception abnormality 4
C1913
Acceleration sensor abnormality 1
C1923
Acceleration sensor abnormality 2
C1933
Acceleration sensor abnormality 3
C1943
Acceleration sensor abnormality 4
C1914
Pressure sensor abnormality 1
C1924
Pressure sensor abnormality 2
C1934
Pressure sensor abnormality 3
C1944
Pressure sensor abnormality 4
C1912
Tire inflation pressure warning 1
C1922
Tire inflation pressure warning 2
C1932
Tire inflation pressure warning 3
C1942
Tire inflation pressure warning 4
C1915
Transmitter OFF mode 1
C1925
Transmitter OFF mode 2
C1935
Transmitter OFF mode 3
C1945
Transmitter OFF mode 4
U0019
Bus off (CAN-B)
P.42C-62
U0141
ETACS-ECU CAN timeout
P.42C-64
U0151
SRS-ECU CAN timeout
P.42C-65
U0154
Occupant classification-ECU CAN timeout
P.42C-67
U0155
Combination meter CAN timeout
P.42C-68
U0164
A/C-ECU CAN timeout
P.42C-70
U0184
Audio CAN timeout
P.42C-71
U0195
Satellite radio tuner CAN timeout
P.42C-73
U0197
Hands free module CAN timeout
P.42C-74
U0245
Audio visual navigation unit CAN timeout
P.42C-76
U1412
Implausible vehicle speed signal received
P.42B-163
U1415
Coding not completed/Data fail
P.42C-79
U1417
Implausible coding data
P.42C-80
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P.42C-56
P.42B-144
P.42B-147
42C-16
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
DIAGNOSTIC TROUBLE CODE PROCEDURES
DTC B1731: Engine control module communication timeout
CAUTION
• When DTC B1731 is set, be sure to diagnose
the CAN bus line.
• When replacing the ECU, always check that
the communication circuit is normal.
.
DTC SET CONDITION
WCM checks that the engine control module data
has been received via the CAN bus lines, and if not,
sets DTC No. B1731.
.
TECHNICAL DESCRIPTION (COMMENT)
If no data [ETACS transmits engine random number
data to WCM via the CAN bus lines] is received from
the engine control module via the CAN bus lines
when the ignition switch is turned to ON position, it is
judged as abnormal.
.
TROUBLESHOOTING HINTS
• Malfunction of CAN bus line
• Malfunction of WCM
• Malfunction of engine control module
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: M.U.T.-III USB Cable
• MB991910: M.U.T.-III Main Harness A
STEP 1. Using scan tool MB991958, diagnose the CAN bus
line.
CAUTION
To prevent damage to scan tool (MB991958), always turn
the ignition switch to the "LOCK" (OFF) position before
connecting or disconnecting scan tool (MB991958).
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Data link connector
Q: Is the CAN bus line found to be normal?
YES : Go to Step 2.
NO : Repair the CAN bus line (Refer to GROUP 54C,
Diagnosis P.54C-14).
MB991910
MB991824
MB991827
AC608435 AB
TSB Revision
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
42C-17
STEP 2. Using scan tool MB991958, check for engine
control module diagnostic trouble code.
Check again if the DTC is set to the engine control module.
Q: Is the DTC set?
YES : Troubleshoot the MFI system (Refer to GROUP 13A,
Diagnostic trouble code chart P.13A-44).
NO : Go to Step 3.
STEP 3. Recheck for diagnostic trouble code.
Check again if the DTC is set to the WCM.
(1) Turn the ignition switch from "LOCK" (OFF) position to "ON"
position.
(2) Check if DTC is set.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?
YES : Replace WCM and register the ID codes (Refer to
P.42C-9). After registering the ID codes, go to Step 4.
NO : The trouble can be an intermittent malfunction (Refer
to GROUP 00 −How to use
Troubleshooting/inspection Service Points −How to
Cope with Intermittent Malfunction P.00-15).
STEP 4. Recheck for diagnostic trouble code.
Check again if the DTC is set to the WCM.
(1) Turn the ignition switch from "LOCK" (OFF) position to "ON"
position.
(2) Check if DTC is set.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?
YES : Replace the engine control module and record the
VIN (Refer to GROUP 00 - How To Perform Vehicle
Identification Number (VIN) Writing P.00-27).
NO : The procedure is complete.
TSB Revision
42C-18
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
DTC B1761: VIN code not programmed
.
CAUTION
• When DTC B1761 is set, be sure to diagnose
the CAN bus line.
• When replacing the ECU, always check that
the communication circuit is normal.
.
DTC SET CONDITION
WCM sets DTC B1761 when no VIN is recorded in it.
TECHNICAL DESCRIPTION (COMMENT)
WCM determines that the abnormality is present
when no VIN is recorded in it.
.
TROUBLESHOOTING HINTS
• VIN not programmed
• Malfunction of the WCM
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: M.U.T.-III USB Cable
• MB991910: M.U.T.-III Main Harness A
STEP 1. Using scan tool MB991958, diagnose the CAN bus
line.
CAUTION
To prevent damage to scan tool (MB991958), always turn
the ignition switch to the "LOCK" (OFF) position before
connecting or disconnecting scan tool (MB991958).
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Data link connector
Q: Is the CAN bus line found to be normal?
YES : Go to Step 2.
NO : Repair the CAN bus line (Refer to GROUP 54C,
Diagnosis P.54C-14).
MB991910
MB991824
MB991827
AC608435 AB
TSB Revision
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
42C-19
STEP 2. Register the VIN and recheck the diagnostic
trouble code.
Register VIN in WCM [Refer to GROUP 00 −How to Perform
Vehicle Identification Number (VIN) Writing P.00-27] and
recheck if the DTC is set.
(1) Turn the ignition switch from the "LOCK" (OFF) position to
the "ON" position.
(2) Check if DTC is set.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?
YES : Replace WCM and register the ID codes (Refer to
P.42C-9).
NO : The procedure is complete.
DTC B1A08: Keyless/KOS key1 performance
DTC B1A09: Keyless/KOS key2 performance
DTC B1A0A: Keyless/KOS key3 performance
DTC B1A0B: Keyless/KOS key4 performance
DTC B1A0C: Keyless key 5 performance
DTC B1A0D: Keyless key 6 performance
DTC B1A0E: Keyless key 7 performance
DTC B1A0F: Keyless key 8 performance
CAUTION
When replacing the ECU, always check that the
communication circuit is normal.
.
DTC SET CONDITION
The door locking/unlocking code is automatically
updated every time the doors are locked (rolling
code). WCM stores DTC B1A08, B1A09, B1A0A,
B1A0B, B1A0C, B1A0D, B1A0E, or B1A0F when it
receives wrong signal (rolling code out of synchronisation) from the transmitter.
.
TECHNICAL DESCRIPTION (COMMENT)
• B1A08: WCM determines that the abnormality is
present when the rolling code received from the
transmitter 1 (the first transmitter registered in
WCM) greatly differs from the rolling code stored
in WCM.
• B1A09: WCM determines that the abnormality is
present when the rolling code received from the
transmitter 2 (the second transmitter registered in
WCM) greatly differs from the rolling code stored
in WCM.
TSB Revision
• B1A0A: WCM determines that the abnormality is
present when the rolling code received from the
transmitter 3 (the third transmitter registered in
WCM) greatly differs from the rolling code stored
in WCM.
• B1A0B: WCM determines that the abnormality is
present when the rolling code received from the
transmitter 4 (the fourth transmitter registered in
WCM) greatly differs from the rolling code stored
in WCM.
• B1A0C: WCM determines that the abnormality is
present when the rolling code received from the
transmitter 5 (the fifth transmitter registered in
WCM) greatly differs from the rolling code stored
in WCM.
• B1A0D: WCM determines that the abnormality is
present when the rolling code received from the
transmitter 6 (the sixth transmitter registered in
WCM) greatly differs from the rolling code stored
in WCM.
• B1A0E: WCM determines that the abnormality is
present when the rolling code received from the
transmitter 7 (the seventh transmitter registered
in WCM) greatly differs from the rolling code
stored in WCM.
42C-20
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
• B1A0F: WCM determines that the abnormality is
present when the rolling code received from the
transmitter 8 (the eighth transmitter registered in
WCM) greatly differs from the rolling code stored
in WCM.
.
TROUBLESHOOTING HINTS
• Rolling code out of synchronisation
• Malfunction of the transmitter
• Malfunction of the WCM
DIAGNOSIS
STEP 2. Check whether the diagnostic trouble
code is reset.
Replace the transmitter by which the DTC is set with
a new one, register the key ID and the keyless ID
(Refer to P.42C-114), and recheck if the DTC is set.
(1) Erase the DTC.
(2) Push the lock switch or unlock switch of
transmitter.
(3) Check if the DTC is set.
Q: Is the DTC set?
YES : Replace WCM and register the ID codes
(Refer to P.42C-9).
NO : The diagnosis is complete.
STEP 1. Synchronise the rolling code and
recheck the diagnostic trouble code.
(1) Synchronise the rolling code. Use either way to
synchronise the rolling code:
• Push the transmitter switches twice or more.
• Resister the keyless ID (Refer to P.42C-114).
NOTE: *: Name of the signals to be registered.
(2) Recheck if the DTC is set.
a. Erase the DTC.
b. Push the lock switch or unlock switch of
transmitter.
c. Check if the DTC is set.
Q: Is the DTC set?
YES : Go to Step 2.
NO : The diagnosis is complete.
TSB Revision
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
42C-21
DTC B1A10: Keyless/KOS key 1 low battery
DTC B1A11: Keyless/KOS key 2 low battery
DTC B1A12: Keyless/KOS key 3 low battery
DTC B1A13: Keyless/KOS key 4 low battery
DTC B1A14: Keyless key 5 low battery
DTC B1A15: Keyless key 6 low battery
DTC B1A16: Keyless key 7 low battery
DTC B1A17: Keyless key 8 low battery
• B1A17: WCM determines that the abnormality is
present when it receives low battery voltage signal from the transmitter 8 (the eighth transmitter
registered in WCM) five consecutive times.
CAUTION
When replacing the ECU, always check that the
communication circuit is normal.
.
DTC SET CONDITION
WCM sets DTC B1A10, B1A11, B1A12, B1A13,
B1A14, B1A15, B1A16, or B1A17 when it receives
low battery voltage signal from the transmitter.
.
TECHNICAL DESCRIPTION (COMMENT)
• B1A10: WCM determines that the abnormality is
present when it receives low battery voltage signal from the transmitter 1 (the first transmitter
registered in WCM) five consecutive times.
• B1A11: WCM determines that the abnormality is
present when it receives low battery voltage signal from the transmitter 2 (the second transmitter
registered in WCM) five consecutive times.
• B1A12: WCM determines that the abnormality is
present when it receives low battery voltage signal from the transmitter 3 (the third transmitter
registered in WCM) five consecutive times.
• B1A13: WCM determines that the abnormality is
present when it receives low battery voltage signal from the transmitter 4 (the fourth transmitter
registered in WCM) five consecutive times.
• B1A14: WCM determines that the abnormality is
present when it receives low battery voltage signal from the transmitter 5 (the fifth transmitter
registered in WCM) five consecutive times.
• B1A15: WCM determines that the abnormality is
present when it receives low battery voltage signal from the transmitter 6 (the sixth transmitter
registered in WCM) five consecutive times.
• B1A16: WCM determines that the abnormality is
present when it receives low battery voltage signal from the transmitter 7 (the seventh transmitter
registered in WCM) five consecutive times.
TSB Revision
.
TROUBLESHOOTING HINTS
• Battery failure in the transmitter
• Malfunction of the transmitter
• Malfunction of WCM
DIAGNOSIS
STEP 1. Replace the battery in the transmitter
and recheck the diagnostic trouble code.
Replace the battery in the transmitter by which the
DTC is set with a new one, and recheck if the DTC is
set (Refer to P.42C-129).
(1) Replace the battery in the transmitter by which
the DTC is set.
(2) Use the transmitter to lock/unlock the doors.
(3) Check if the DTC is set.
Q: Is the DTC set?
YES : Go to Step 2.
NO : The diagnosis is complete (Discharged
battery).
STEP 2. Replace the transmitter and recheck the
diagnostic trouble code.
Replace the transmitter by which the DTC is set with
a new one, register the key ID and the keyless entry
secret code (Refer to P.42C-114), and recheck if the
DTC is set.
(1) Use the transmitter to lock/unlock the doors.
(2) Check if the DTC is set.
Q: Is the DTC set?
YES : Replace WCM and register the ID codes
(Refer to P.42C-9).
NO : The diagnosis is complete.
42C-22
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
DTC B1A24: Key ID not registered
.
CAUTION
• When the DTC B1A24 is set, be sure to diagnose the CAN bus line.
• When replacing the ECU, always check that
the communication circuit is normal.
TECHNICAL DESCRIPTION (COMMENT)
WCM determines that the abnormality is present, if
the ignition key's key ID is not registered in WCM
when the ignition switch is turned ON.
.
.
TROUBLESHOOTING HINTS
DTC SET CONDITION
WCM sets DTC B1A24 when the key ID was not registered in it.
• Key ID not registered
• Malfunction of the ignition key
• Malfunction of WCM
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: M.U.T.-III USB Cable
• MB991910: M.U.T.-III Main Harness A
STEP 1. Using scan tool MB991958, diagnose the CAN bus
line.
CAUTION
To prevent damage to scan tool (MB991958), always turn
the ignition switch to the "LOCK" (OFF) position before
connecting or disconnecting scan tool (MB991958).
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Data link connector
Q: Is the CAN bus line found to be normal?
YES : Go to Step 2.
NO : Repair the CAN bus line (Refer to GROUP 54C,
Diagnosis P.54C-14).
MB991910
MB991824
MB991827
AC608435 AB
TSB Revision
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
42C-23
STEP 2. Register the key ID and recheck the diagnostic
trouble code.
Register the key ID of the ignition key (refer to P.42C-9), and
recheck if the DTC is set.
(1) Turn the ignition switch from the "LOCK" (OFF) position to
the "ON" position.
(2) Check if the DTC is set.
Q: Is the DTC set?
YES : Replace WCM and register the ID codes (Refer to
P.42C-9).
NO : The procedure is complete.
DTC B1A25: Key ID unmatched
CAUTION
When the DTC B1A25 is set, be sure to diagnose
the CAN bus line.When replacing the ECU,
always check that the communication circuit is
normal.
TECHNICAL DESCRIPTION (COMMENT)
WCM determines that the abnormality is present, if
the key ID for the ignition key does not match the one
registered in WCM when the ignition switch is turned
ON.
.
DTC SET CONDITION
.
WCM sets DTC B1A25 when the received key ID is
different from the one registered in it.
.
TROUBLESHOOTING HINTS
•
•
•
•
•
Malfunction of the ignition key
Accessory key not registered
Accessory WCM not registered
Key is registered to another vehicle
Malfunction of WCM
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: M.U.T.-III USB Cable
• MB991910: M.U.T.-III Main Harness A
TSB Revision
42C-24
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
STEP 1. Using scan tool MB991958, diagnose the CAN bus
line.
CAUTION
To prevent damage to scan tool (MB991958), always turn
the ignition switch to the "LOCK" (OFF) position before
connecting or disconnecting scan tool (MB991958).
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Data link connector
Q: Is the CAN bus line found to be normal?
YES : Go to Step 2.
NO : Repair the CAN bus line (Refer to GROUP 54C,
Diagnosis P.54C-14).
MB991910
MB991824
MB991827
AC608435 AB
STEP 2. Register the key ID and recheck the diagnostic
trouble code.
Register the key ID of the ignition key (refer to P.42C-9), and
recheck if the DTC is set.
(1) Turn the ignition switch from the "LOCK" (OFF) position to
the "ON" position.
(2) Check if the DTC is set.
Q: Is the DTC set?
YES : Go to Step 3.
NO : The procedure is complete.
STEP 3. Replace the ignition key and recheck the
diagnostic trouble code.
Replace the ignition key by which the DTC is set with the other
key, and recheck if the DTC is set.
(1) Turn the ignition switch from the "LOCK" (OFF) position to
the "ON" position.
(2) Check if the DTC is set.
Q: Is the DTC set?
YES : Go to Step 4.
NO : Go to Step 5.
TSB Revision
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
42C-25
STEP 4. Register the key ID and recheck the diagnostic
trouble code.
Register the key ID of the ignition key (refer to P.42C-9), and
recheck if the DTC is set.
(1) Turn the ignition switch from the "LOCK" (OFF) position to
the "ON" position.
(2) Check if the DTC is set.
Q: Is the DTC set?
YES : Go to Step 5.
NO : The procedure is complete.
STEP 5. Replace the ignition key and recheck the
diagnostic trouble code.
Replace the ignition key with a new one, register the key ID and
keyless ID of the new key, (refer to P.42C-9), and recheck if the
DTC is set.
(1) Turn the ignition switch from the "LOCK" (OFF) position to
the "ON" position.
(2) Check if the DTC is set.
Q: Is the DTC set?
YES : Replace WCM and register the ID codes (Refer to
P.42C-9).
NO : The procedure is complete.
DTC B1A28: Engine control module authenticate error
CAUTION
• When DTC B1A28 is set, be sure to diagnose
the CAN bus line.
• When replacing the ECU, always check that
the communication circuit is normal.
.
DTC SET CONDITION
WCM sets DTC B1A28 when the ignition key certification result and the engine control module starting
condition do not match.
.
TECHNICAL DESCRIPTION (COMMENT)
WCM determines that the abnormality is present, if
the key certification result and the engine control
module starting condition do not match after the
engine start permission communication is completed.
.
TROUBLESHOOTING HINTS
•
•
•
•
Malfunction of CAN bus line
Malfunction of WCM
Malfunction of engine control module
VIN registered in engine control module
unmatched
DIAGNOSIS
Required Special Tools:
• MB991958 Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827 M.U.T.-III USB Cable
• MB991910 M.U.T.-III Main Harness A
TSB Revision
42C-26
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
STEP 1. Using scan tool MB991958, diagnose the CAN bus
line.
CAUTION
To prevent damage to scan tool (MB991958), always turn
the ignition switch to the "LOCK" (OFF) position before
connecting or disconnecting scan tool (MB991958).
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Data link connector
Q: Is the CAN bus line found to be normal?
YES : Go to Step 2.
NO : Repair the CAN bus line (Refer to GROUP 54C,
Diagnosis P.54C-14).
MB991910
MB991824
MB991827
AC608435 AB
STEP 2. Using scan tool MB991958, read the engine
control module diagnostic trouble code.
Check again if the DTC is set to the engine control module.
Q: Is the DTC set?
YES : Troubleshoot the MFI system (Refer to GROUP 13A,
Diagnostic trouble code chart P.13A-44).
NO : Go to Step 3.
STEP 3. Using scan tool MB991958, read the diagnostic
trouble code.
Check if the DTC is set to the WCM.
(1) Turn the ignition switch from the "LOCK" (OFF) position to
the "ON" position.
(2) Check if the DTC is set.
Q: Is DTC B1761 or B2206 set other than B1A28?
YES : Perform the troubleshooting for each DTC. Refer to
P.42C-18 <B1761> and P.42C-35 <B2206>.
NO : Go to Step 4.
TSB Revision
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
42C-27
STEP 4. Recheck for diagnostic trouble code.
Check again if the DTC is set to the WCM.
(1) Turn the ignition switch from the "LOCK" (OFF) position to
the "ON" position.
(2) Check if the DTC is set.
Q: Is the DTC set?
YES : Replace WCM and register the ID codes (Refer to
P.42C-9). Then go to Step 5.
NO : The diagnosis is complete.
STEP 5. Recheck for diagnostic trouble code.
Check again if the DTC is set to the WCM.
(1) Turn the ignition switch from the "LOCK" (OFF) position to
the "ON" position.
(2) Check if the DTC is set.
Q: Is the DTC set?
YES : Replace the engine control module and record VIN
(Refer to GROUP 00 −How to Perform Vehicle
Identification Number (VIN) Writing P.00-27).
NO : The procedure is complete.
DTC B1A35: Transponder read error
.
CAUTION
• When DTC B1A35 is set, be sure to diagnose
the CAN bus line.
• When replacing the ECU, always check that
the communication circuit is normal.
TECHNICAL DESCRIPTION (COMMENT)
WCM determines that the abnormality is present, if it
cannot receive the key ID for the ignition key when
the ignition switch is turned ON.
.
.
TROUBLESHOOTING HINTS
DTC SET CONDITION
WCM sets DTC B1A35 when it cannot receive data
from the transponder.
• Malfunction of the ignition key
• Malfunction of WCM
• Interference of the key ID
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: M.U.T.-III USB Cable
• MB991910: M.U.T.-III Main Harness A
TSB Revision
42C-28
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
STEP 1. Using scan tool MB991958, diagnose the CAN bus
line.
CAUTION
To prevent damage to scan tool (MB991958), always turn
the ignition switch to the "LOCK" (OFF) position before
connecting or disconnecting scan tool (MB991958).
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Data link connector
Q: Is the CAN bus line found to be normal?
YES : Go to Step 2.
NO : Repair the CAN bus line (Refer to GROUP 54C,
Diagnosis P.54C-14).
MB991910
MB991824
MB991827
AC608435 AB
STEP 2. Check the ignition key inserted in the key cylinder
for interference.
Q: Are there other ignition keys or anything that interferes
with the communication (things that generate radio
waves such as magnets or air-cleaning device that has
a power plug) near the ignition key inserted in the key
cylinder?
YES : Move away or remove other ignition keys or anything
that interferes with the communication, and go to Step
3.
NO : Go to Step 3.
STEP 3. Recheck for diagnostic trouble code.
Check again if the DTC is set to the WCM.
(1) Turn the ignition switch from the "LOCK" (OFF) position to
the "ON" position.
(2) Check if the DTC is set.
Q: Is the DTC set?
YES : Go to Step 4.
NO : The procedure is complete.
TSB Revision
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
42C-29
STEP 4. Replace the ignition key and recheck the
diagnostic trouble code.
Replace the ignition key by which the DTC is set with the other
key, and recheck if the DTC is set.
(1) Turn the ignition switch from the "LOCK" (OFF) position to
the "ON" position.
(2) Check if the DTC is set.
Q: Is the DTC set?
YES : Go to Step 5.
NO : Go to Step 6.
STEP 5. Register the key ID and recheck the diagnostic
trouble code.
Register the key ID of the ignition key (refer to P.42C-9), and
recheck if the DTC is set.
(1) Turn the ignition switch from the "LOCK" (OFF) position to
the "ON" position.
(2) Check if the DTC is set.
Q: Is the DTC set?
YES : Go to Step 6.
NO : The procedure is complete.
STEP 6. Replace the ignition key and recheck the
diagnostic trouble code.
Replace the ignition key by which the DTC is set with a new
one, register the key ID of the new key, (refer to P.42C-9), and
recheck if the DTC is set.
(1) Turn the ignition switch from the "LOCK" (OFF) position to
the "ON" position.
(2) Check if the DTC is set.
Q: Is the DTC set?
YES : Replace WCM and register the ID codes (Refer to
P.42C-9).
NO : The procedure is complete.
TSB Revision
42C-30
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
DTC B2101: IG SW start POS.circuit low
DTC B2102: IG SW start POS.circuit high
CAUTION
• If DTC B2101 or B2102 is set, be sure to diagnose the CAN bus line.
• Before replacing the ECU, ensure that the
communication circuit is normal.
WCM Communication Circuit
FUSIBLE
LINK 34
IGNITION
SWITCH (IG1)
ETACSECU
IG1
RELAY
WCM
IMMOBILIZER
ANTENNA
KEY ID
TRANSPONDER
Connector: C-07
Connector: C-317
Junction block
C-07
AC708972AB
AC708951CD
.
TSB Revision
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
DTC SET CONDITION
WCM sets DTC B2101 or B2102 when the actual
state of the ignition switch and the ignition switch
position information received from ETACS-ECU via
CAN do not match.
.
TECHNICAL DESCRIPTION (COMMENT)
WCM determines that the abnormality is present, if it
has detected discrepancy in the ignition switch level
shown below ten consecutive times when WCM has
received the CAN message (ignition switch position
information) from ETACS-ECU with the ignition
switch turned to the ON or START position.
42C-31
B2101
• Status of ignition switch: OFF position
• Ignition switch position information from the
ETACS-ECU: ON
B2102
• Status of ignition switch: ON position
• Ignition switch position information from the
ETACS-ECU: OFF
.
TROUBLESHOOTING HINTS
•
•
•
•
•
Malfunction of CAN bus line
Malfunction of the WCM
Malfunction of the ignition switch
Damaged wiring harness and connectors
Malfunction of ETACS-ECU
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: M.U.T.-III USB Cable
• MB991910: M.U.T.-III Main Harness A
STEP 1. Using scan tool MB991958, diagnose the CAN bus
line.
CAUTION
To prevent damage to scan tool (MB991958), always turn
the ignition switch to the "LOCK" (OFF) position before
connecting or disconnecting scan tool (MB991958).
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Data link connector
Q: Is the CAN bus line found to be normal?
YES : Go to Step 2.
NO : Repair the CAN bus line (Refer to GROUP 54C,
Diagnosis P.54C-14).
MB991910
MB991824
MB991827
AC608435 AB
TSB Revision
42C-32
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
STEP 2. Check ETACS-ECU connector C-317 and WCM
connector C-07 for loose, corroded or damaged terminals,
or terminals pushed back in the connector.
Q: Is ETACS-ECU connector C-317 and WCM connector
C-07 in good condition?
YES : Go to Step 3.
NO : Repair the defective connector.
STEP 3. Check the wiring harness between WCM
connector C-07 (terminal No.9) and the ETACS-ECU
connector C-317 (terminal No.5) for open circuit.
(1) Disconnect WCM connector C-07 and ETACS-ECU
connector C-317, and check the wiring harness.
(2) Check the wiring harness between WCM connector C-07
(terminal No.9) and ETACS-ECU connector C-317 (terminal
No.5)
OK: Continuity exists (2 Ω or less)
Harness side: C-317
Harness side: C-07
AC709707EP
AC709707
Q: Is the wiring harness between WCM connector C-07
(terminal No.9) and the ETACS-ECU connector C-317
(terminal No.5) in good condition?
YES : Go to Step 4.
NO : Repair the wiring harness between WCM connector
C-07 (terminal No.9) and ETACS-ECU connector
C-317 (terminal No.5).
STEP 4. Using scan tool MB991958, check data list.
Use the ETACS-ECU data list to check the signals related to
the ignition voltage.
(1) Turn the ignition switch from "LOCK" (OFF) position to "ON"
position.
Item No.
Item name
Normal
condition
Item 254
IG voltage
Battery
voltage
Q: Does scan tool MB991958 display the item "IG voltage"
as normal condition?
YES : Go to Step 5.
NO : Diagnose the ETACS-ECU (Refer to GROUP 54A −
ETACS, Diagnosis P.54A-582).
TSB Revision
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
42C-33
STEP 5. Recheck for diagnostic trouble code.
Check again if the DTC is set to the WCM.
(1) Erase the DTC.
(2) Turn the ignition switch from "LOCK" (OFF) position to "ON"
position.
(3) Check if DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?
YES : Replace WCM and register the ID codes (Refer to
P.42C-9).
NO : The trouble can be an intermittent malfunction (Refer
to GROUP 00 −How to use
Troubleshooting/inspection Service Points −How to
Cope with Intermittent Malfunction P.00-15).
DTC B2204: Coding data mismatch
.
CAUTION
• When DTC B2204 is set, be sure to diagnose
the CAN bus line.
• When replacing the ECU, always check that
the communication circuit is normal.
TECHNICAL DESCRIPTION (COMMENT)
WCM determines that the abnormality is present
when the vehicle information registered in it does not
match the vehicle information data.
.
.
TROUBLESHOOTING HINTS
DTC SET CONDITION
If the vehicle information data transmitted from the
ETACS-ECU via the CAN bus lines is different from
that registered in the WCM, the WCM sets the DTC
No. B2204.
• Malfunction of WCM
• Malfunction of ETACS-ECU
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: M.U.T.-III USB Cable
• MB991910: M.U.T.-III Main Harness A
TSB Revision
42C-34
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
STEP 1. Using scan tool MB991958, diagnose the CAN bus
line.
CAUTION
To prevent damage to scan tool (MB991958), always turn
the ignition switch to the "LOCK" (OFF) position before
connecting or disconnecting scan tool (MB991958).
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Data link connector
Q: Is the CAN bus line found to be normal?
YES : Go to Step 2.
NO : Repair the CAN bus line (Refer to GROUP 54C,
Diagnosis P.54C-14).
MB991910
MB991824
MB991827
AC608435 AB
STEP 2. Using scan tool MB991958, read the ETACS-ECU
diagnostic trouble code
Check again if the DTC is set to the ETACS-ECU.
Q: Is the DTC set?
YES : Troubleshoot the ETACS (Refer to GROUP 54A −
ETACS, Diagnosis P.54A-582).
NO : Go to Step 3.
STEP 3. Recheck for diagnostic trouble code.
Check again if the DTC is set to the WCM.
(1) Erase the DTC.
(2) Turn the ignition switch from "LOCK" (OFF) position to "ON"
position.
(3) Check if DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?
YES : Replace WCM and register the ID codes (Refer to
P.42C-9).
NO : The trouble can be an intermittent malfunction (Refer
to GROUP 00 −How to use
Troubleshooting/inspection Service Points −How to
Cope with Intermittent Malfunction P.00-15).
TSB Revision
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
42C-35
DTC B2206: VIN code mismatch
.
.
DTC SET CONDITION
TROUBLESHOOTING HINTS
WCM sets DTC B2206 when VIN registered in it and
VIN that has been transmitted on the CAN bus do not
match.
.
• Malfunction of WCM
• VIN registered in engine control module
unmatched
• WCM being registered to another vehicle
TECHNICAL DESCRIPTION (COMMENT)
WCM determines that the abnormality is present
when VIN registered in it and the one that has been
transmitted on the CAN bus do not match.
DIAGNOSIS
Required Special Tools:
• MB991958 Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827 M.U.T.-III USB Cable
• MB991910 M.U.T.-III Main Harness A
STEP 1. Check the VIN registered in the engine control
module and the VIN of the vehicle.
Check if the VIN registered in the engine control module
matches with the VIN of the vehicle.
(1) On the system selection screen of the M.U.T.-III, select
"MFI/GDI/Diesel".
(2) Select "Coding."
(3) Select "VIN Information."
(4) Compare with the VIN of the vehicle.
Q: Does the VIN of the engine control module match with
the VIN of the vehicle?
YES : Go to Step 2.
NO : Write the VIN to the engine control module. [Refer to
GROUP 00 −How to Perform Vehicle Identification
Number (VIN) Writing P.00-27]. Record VIN and go to
Step 2 .
TSB Revision
42C-36
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
STEP 2. Recheck for diagnostic trouble code.
Check again if the DTC is set to the WCM.
CAUTION
To prevent damage to scan tool (MB991958), always turn
the ignition switch to the "LOCK" (OFF) position before
connecting or disconnecting scan tool (MB991958).
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Check if the DTC is set.
Data link connector
Q: Is the DTC set?
YES : Replace WCM and register the ID codes (Refer to
P.42C-9). After registering the ID codes, go to Step 3.
NO : The procedure is complete.
MB991910
MB991824
MB991827
AC608435 AB
STEP 3. Recheck for diagnostic trouble code.
Check again if the DTC is set to the WCM.
(1) Turn the ignition switch to the "ON" position.
(2) Check if the DTC is set.
Q: Is the DTC set?
YES : Replace the engine control module and record the
VIN [Refer to GROUP 00 −How To Perform Vehicle
Identification Number (VIN) Writing P.00-27].
NO : The procedure is complete.
TSB Revision
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
42C-37
DTC B2352: Antenna fail
TECHNICAL DESCRIPTION (COMMENT)
.
DTC SET CONDITION
WCM sets DTC B2352 when open or short circuit to
the ground in the antenna is detected.
.
When the ignition switch is turned ON, WCM transmits signal to the antenna. When the antenna is
found faulty, WCM determines that the abnormality is
present.
.
TROUBLESHOOTING HINT
Malfunction of WCM (Open circuit in antenna)
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: M.U.T.-III USB Cable
• MB991910: M.U.T.-III Main Harness A
Recheck for diagnostic trouble code.
Check again if the DTC is set to the WCM.
CAUTION
To prevent damage to scan tool (MB991958), always turn
the ignition switch to the "LOCK" (OFF) position before
connecting or disconnecting scan tool (MB991958).
(1) Connect scan tool MB991958 to the data link connector.
Erase the DTC.
(2) Turn the ignition switch from "LOCK" (OFF) position to "ON"
position.
(3) Check if DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Data link connector
Q: Is the DTC set?
YES : Replace WCM and register the ID codes (Refer to
P.42C-9).
NO : The procedure is complete.
MB991910
MB991824
MB991827
AC608435 AB
TSB Revision
42C-38
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
DTC B2401: Keyless/KOS key ID not register
.
CAUTION
• If DTC B2401 is set, be sure to diagnose the
CAN bus line.
• When replacing the ECU, always check that
the communication circuit is normal.
.
DTC SET CONDITION
If the keyless ID registered transmitter is not registered to the WCM, the WCM sets the DTC No.
B2401.
TECHNICAL DESCRIPTION (COMMENT)
If the number of keyless ID registered transmitter is
zero, the WCM determines that there is a problem.
.
TROUBLESHOOTING HINTS
• Malfunction of CAN bus line
• Failure of transmitter registration process
• Malfunction of WCM
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: M.U.T.-III USB Cable
• MB991910: M.U.T.-III Main Harness A
STEP 1. Using scan tool MB991958, diagnose the CAN bus
line.
CAUTION
To prevent damage to scan tool (MB991958), always turn
the ignition switch to the "LOCK" (OFF) position before
connecting or disconnecting scan tool (MB991958).
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Data link connector
Q: Is the CAN bus line found to be normal?
YES : Go to Step 2.
NO : Repair the CAN bus line (Refer to GROUP 54C,
Diagnosis P.54C-14).
MB991910
MB991824
MB991827
AC608435 AB
TSB Revision
42C-39
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
STEP 2. Register the keyless ID and recheck the
diagnostic trouble code.
Register the keyless ID (Refer to P.42C-9), and recheck if the
DTC is set.
(1) Erase the DTC.
(2) Turn the ignition switch from the "LOCK" (OFF) position to
the "ON" position.
(3) Check if the DTC is set.
Q: Is the DTC set?
YES : Replace WCM and register the ID codes (Refer to
P.42C-9).
NO : The procedure is complete.
DTC B2415: RA module power voltage
CAUTION
• If DTC B2415 is set, diagnose the CAN bus
lines.
• When replacing the ECU, always check that
the communication circuit is normal.
Wireless Control Module System Input Signal
RECEIVER
ANTENNA
ASSEMBLY
KEYLESS
ENTRY
TRANSMITTER
GREEN
-RED
RED
REDWHITE
BROWN
-WHITE
YELLOW
-GREEN
GREEN
-RED
RED
REDWHITE
BROWN
-WHITE
YELLOW
-GRAY
RECEIVER
YELLOW
-GRAY
BROWN
-WHITE
REDWHITE
RED
GREEN
-RED
JOINT
CONNECTOR (6)
WIRELESS
CONTROL
MODULE
AC709290 AB
TSB Revision
42C-40
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
Connector: D-14
Connectors: C-07, C-16
C-16 (B)
C-07
AC708955AM
AC708951AY
.
DTC SET CONDITION
Connector: C-41
If an open circuit or short to ground occurs in the
receiver antenna assembly, WCM sets DTC B2415.
.
TECHNICAL DESCRIPTION (COMMENT)
AC708950BA
The receiver antenna assembly receives the transmitter signal. The receiver antenna assembly transmits the received signal to the WCM. If an open
circuit or short to ground occurs on the wiring harness between WCM and receiver antenna assembly
at this time, WCM determines that there is a problem.
.
TROUBLESHOOTING HINTS
•
•
•
•
Malfunction of CAN bus line
Malfunction of the receiver antenna assembly
Malfunction of the WCM
Damaged wiring harness and connectors
DIAGNOSIS
Required Special Tools:
• MB991958 Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: Vehicles Communication Interface (V.C.I.)
• MB991827 M.U.T.-III USB Cable
• MB991910 M.U.T.-III Main Harness A
TSB Revision
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
42C-41
STEP 1. Using scan tool MB991958, diagnose the CAN bus
line.
CAUTION
To prevent damage to scan tool (MB991958), always turn
the ignition switch to the "LOCK" (OFF) position before
connecting or disconnecting scan tool (MB991958).
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Data link connector
Q: Is the CAN bus line found to be normal?
YES : Go to Step 2.
NO : Repair the CAN bus line (Refer to GROUP 54C,
Diagnosis P.54C-14).
MB991910
MB991824
MB991827
AC608435 AB
STEP 2. Check receiver antenna assembly connector D-14
and WCM connector C-07 for loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Q: Is the receiver antenna assembly connector D-14 and
WCM connector C-07 in good condition?
YES : Go to Step 3.
NO : Repair the defective connector.
TSB Revision
42C-42
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
STEP 3. Check the wiring harness between the receiver
antenna assembly connector D-14 (terminal Nos. 8, 12) and
the WCM connector C-07 (terminal Nos. 8, 12) for open
circuit.
(1) Disconnect reciever anntena assembly connector D-14 and
WCM connector C-07, and check the wiring harness.
(2) Check the wiring harness between reciever anntena
assembly connector D-14 (terminal No.8) and WCM
connector C-07 (terminal No.8).
OK: Continuity exists (2 Ω or less)
Harness side: D-14
Harness side: C-07
AC709707 HT
(3) Check the wiring harness between reciever anntena
assembly connector D-14 (terminal No.12) and WCM
connector C-07 (terminal No.12).
OK: Continuity exists (2 Ω or less)
Harness side: D-14
Harness side: C-07
AC709707HU
Q: Is the wiring harness between receiver antenna
assembly connector D-14 (terminal Nos. 8, 12) and the
WCM connector C-07 (terminal Nos. 8, 12) in good
condition?
YES : Go to Step 4.
NO (receiver antenna assembly connector D-14 terminal
No.8 −WCM connector C-07 terminal No.8.) : Repair the
wiring harness between receiver antenna assembly
connector D-14 (terminal No.8) and WCM connector
C-07 (terminal No.8).
NO (receiver antenna assembly connector D-14 terminal
No.12 −WCM connector C-07 terminal No.12.) : Repair
the wiring harness between receiver antenna
assembly connector D-14 (terminal No.12) and WCM
connector C-07 (terminal No.12).
TSB Revision
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
42C-43
STEP 4. Check the wiring harness between the receiver
antenna assembly connector D-14 (terminal Nos. 8, 12) and
the ground for short circuit.
(1) Disconnect reciever anntena assembly connector D-14,
and check the wiring harness.
(2) Check the wiring harness between reciever anntena
assembly connector D-14 (terminal No.8) and and ground
OK: No continuity
Harness side: D-14
AC709707FY
(3) Check the wiring harness between reciever anntena
assembly connector D-14 (terminal No.12) and and ground
OK: No continuity
Harness side: D-14
AC709707FX
Q: Is the wiring harness between receiver antenna
assembly connector D-14 (terminal Nos. 8, 12) and the
ground in good condition?
YES : Go to Step 5.
NO (receiver antenna assembly connector D-14 terminal
No.8 −ground.) : Repair the wiring harness between
receiver antenna assembly connector D-14 (terminal
No.8) and the ground.
NO (receiver antenna assembly connector D-14 terminal
No.12 −ground.) : Repair the wiring harness between
receiver antenna assembly connector D-14 (terminal
No.12) and the ground.
STEP 5. Replace the receiver antenna assembly, and check
whether the diagnostic trouble code is reset.
(1) Erase the DTC.
(2) Turn the ignition switch from the "LOCK" (OFF) position to
the "ON" position.
(3) Check if the DTC is set.
Q: Is the DTC set?
YES : Replace WCM and register the ID codes (Refer to
P.42B-12).
NO : The procedure is complete.
TSB Revision
42C-44
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
DTC B2416: ECU internal error
TECHNICAL DESCRIPTION (COMMENT)
.
DTC SET CONDITION
WCM sets DTC B2416 when it determines an abnormal status within itself.
WCM determines that the abnormality is present, if
the data abnormality is found when the ignition
switch is turned ON and then EEPROM is written.
.
.
TROUBLESHOOTING HINTS
Malfunction of WCM
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: M.U.T.-III USB Cable
• MB991910: M.U.T.-III Main Harness A
Recheck for diagnostic trouble code.
Check again if the DTC is set to the WCM.
CAUTION
To prevent damage to scan tool (MB991958), always turn
the ignition switch to the "LOCK" (OFF) position before
connecting or disconnecting scan tool (MB991958).
(1) Connect scan tool MB991958 to the data link connector.
(2) Erase the DTC.
(3) Turn the ignition switch from "LOCK" (OFF) position to "ON"
position.
(4) Check if DTC is set.
(5) Turn the ignition switch to the "LOCK" (OFF) position.
Data link connector
Q: Is the DTC set?
YES : Replace WCM and register the ID codes (Refer to
P.42C-9).
NO : The trouble can be an intermittent malfunction (Refer
to GROUP 00 −How to use
Troubleshooting/inspection Service Points −How to
Cope with Intermittent Malfunction P.00-15).
MB991910
MB991824
MB991827
AC608435 AB
TSB Revision
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
42C-45
DTC C1608: EEPROM Error
CAUTION
If there is any problem in the CAN bus lines, an incorrect
diagnostic trouble code may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C,
Trouble code diagnosis P.54C-14).
.
DTC SET CONDITION
WCM incorporates EEPROM (nonvolatile memory), and that
EEPROM stores the TPMS, WCM and immobilizer information.
When the data in EEPROM is failed, this code is set.
.
TROUBLESHOOTING HINTS
The most likely causes for this DTC to set are:
• Damaged wiring harness and connector
• Malfunction of WCM
DIAGNOSIS
Required Special Tools:
• MB991958 Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827 M.U.T.-III USB Cable
• MB991910 M.U.T.-III Main Harness A
STEP 1. M.U.T.-III CAN bus diagnostics
Use scan tool to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair the CAN bus lines (Refer to GROUP 54C −
CAN Bus Diagnostics table P.54C-9). On completion,
go to Step 2.
STEP 2. Diagnostic trouble code check
(1) Turn the ignition switch to the "LOCK" (OFF) position.
(2) Turn the ignition switch to the "ON" position.
(3) Check if the DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC C1608 set?
YES : Replace the WCM and register the ID codes (Refer to
P.42C-114). Then go to Step 3.
NO : The procedure is complete.
STEP 3. Diagnostic trouble code check
(1) Turn the ignition switch to the "LOCK" (OFF) position.
(2) Turn the ignition switch to the "ON" position.
(3) Check if the DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC C1608 set?
YES : Start over at Step 1.
NO : The procedure is complete.
TSB Revision
42C-46
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
DTC C1900: No Registration
CAUTION
If there is any problem in the CAN bus lines, an incorrect
diagnostic trouble code may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C,
Trouble code diagnosis P.54C-14).
.
DTC SET CONDITION
When the ID registration information of the TPMS transmitter is
not stored in the WCM, and/or when the WCM is replaced with
a new one, this code is set. If the ID registration mode is terminated forcibly or time-out after one or more TPMS transmitters
are registered in the ID registration mode, the ID information in
the WCM is erased, and this diagnostic trouble code is set.
.
TROUBLESHOOTING HINTS
The most likely causes for this DTC to set are:
• Damaged wiring harness and connector
• Malfunction of TPMS transmitter
• Malfunction of WCM
• ID code registration failed.
DIAGNOSIS
Required Special Tools:
• MB991958 Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827 M.U.T.-III USB Cable
• MB991910 M.U.T.-III Main Harness A
STEP 1. M.U.T.-III CAN bus diagnostics
Use scan tool to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair the CAN bus lines (Refer to GROUP 54C −
CAN Bus Diagnostics table P.54C-240). On
completion, go to Step 2.
STEP 2. Diagnostic trouble code check
(1) Turn the ignition switch to the "LOCK" (OFF) position.
(2) Turn the ignition switch to the "ON" position.
(3) Check if the DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC C1900 set?
YES : Register the ID codes (Refer to P.42C-114). Then go
to Step 3.
NO : The procedure is complete.
TSB Revision
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
42C-47
STEP 3. Recheck for diagnostic trouble code.
Check again if the DTC is set.
(1) Turn the ignition switch to the "LOCK" (OFF) position.
(2) Turn the ignition switch to the "ON" position.
(3) Check if the DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC C1900 reset?
YES : Replace the WCM and register the ID codes (Refer to
P.42C-114). Then start over at Step 1.
NO : The procedure is complete.
DTC C1901: Vehicle Speed Information Abnormality
CAUTION
If there is any problem in the CAN bus lines, an incorrect
diagnostic trouble code may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C,
Trouble code diagnosis P.54C-14).
.
DTC SET CONDITION
WCM receives the wheel speed information from ASC-ECU via
the CAN-bus line. Although WCM receives the information that
the wheel is not currently rotated from ASC-ECU, if the TPMS
transmitter sends the information that the wheel is rotated, this
code is set.
.
TROUBLESHOOTING HINTS
The most likely causes for this DTC to set are:
• Damaged wiring harness and connector
• Malfunction of TPMS transmitter
• Malfunction of WCM
• Malfunction of ASC-ECU
• Malfunction of ETACS-ECU
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: M.U.T.-III USB Cable
• MB991910: M.U.T.-III Main Harness A
STEP 1. M.U.T.-III CAN bus diagnostics
Use scan tool to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair the CAN bus lines (Refer to GROUP 54C −
CAN Bus Diagnostics table P.54C-14). On
completion, go to Step 2.
TSB Revision
42C-48
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
STEP 2. Diagnostic trouble code recheck after resetting
CAN bus lines
(1) Turn the ignition switch to the "LOCK" (OFF) position.
(2) Turn the ignition switch to the "ON" position.
(3) Check if the DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC C1901 set?
YES : Go to Step 3.
NO : The procedure is complete.
STEP 3. Check for other diagnostic trouble code.
Check if the diagnostic trouble code is set from ASC-ECU
(Refer to GROUP 35C, diagnostic trouble code chart
P.35C-20).
Q: Is the check result normal?
YES : Go to Step 4.
NO : Carry out the troubleshooting for ASC-ECU (Refer to
GROUP 35C, diagnostic trouble code chart
P.35C-20). Then go to Step 6.
STEP 4. Check for other diagnostic trouble code.
Check if the diagnostic trouble code is set from ETACS-ECU
(Refer to GROUP 54A, ETACS −diagnostic trouble code chart
P.54A-582).
Q: Is the check result normal?
YES : Go to Step 5.
NO : Troubleshoot the set DTC (Refer to GROUP 54A,
ETACS −diagnostic trouble code chart P.54A-582).
Then go to Step 6.
STEP 5. Check the TPMS transmitter acceleration.
Check the acceleration value of each TPMS transmitter by the
TPMS transmitter check function (Refer to P.42C-114).
OK:
Acceleration value: 5G or less
Q: Is the check result OK?
YES : Replace the WCM and register ID codes (Refer to
P.42C-9). Then go to Step 6.
NO : Replace the TPMS transmitter and register ID codes
(Refer to P.42C-9). Then go to Step 6.
STEP 6. Recheck for diagnostic trouble code.
(1) Turn the ignition switch to the "LOCK" (OFF) position.
(2) Turn the ignition switch to the "ON" position.
(3) Check if the DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC C1901 set?
YES : Start over at Step 1.
NO : The procedure is complete.
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42C-49
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
DTC C1910: Transmitter low battery voltage abnormality 1
DTC C1920: Transmitter low battery voltage abnormality 2
DTC C1930: Transmitter low battery voltage abnormality 3
DTC C1940: Transmitter low battery voltage abnormality 4
DTC C1911: Reception abnormality 1
DTC C1921: Reception abnormality 2
DTC C1931: Reception abnormality 3
DTC C1941: Reception abnormality 4
RECEIVER
RECEIVER
ANTENNA
ASSEMBLY
JOINT
CONNECTOR
(6)
WIRELESS CONTROL
MODULE
AC709591
Connectors: C-07, C-16
Connector: C-41
C-16 (B)
C-07
AC708951AY
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AC708950BA
42C-50
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
Connector: D-14
AC708955AM
CAUTION
If there is any problem in the CAN bus lines, an incorrect
diagnostic trouble code may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C,
Trouble code diagnosis P.54C-14).
.
DTC SET CONDITION
DTC C1910, C1920, C1930, C1940
• When the reception abnormality warning is activated
because of the low battery voltage of the TPMS transmitter.
DTC C1911, C1921, C1931, C1941
• When WCM cannot receive the signals from the TPMS
transmitters while driving for about 20 minuites, this code is
set.
.
TROUBLESHOOTING HINTS
The most likely causes for this DTC to set are:
• Low battery that is incorporated into the TPMS transmitter
• Damaged wiring harness and connector
• Registered IDs unmatched
• Malfunction of Receiver antenna assembly
• Malfunction of TPMS transmitter
• Malfunction of WCM
DIAGNOSIS
Required Special Tools:
• MB991958 Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827 M.U.T.-III USB Cable
• MB991910 M.U.T.-III Main Harness A
STEP 1. M.U.T.-III CAN bus diagnostics
Use scan tool to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Then go to Step 3.
NO : Repair the CAN bus lines (Refer to GROUP 54C −
CAN Bus Diagnostics table P.54C-240). Then go to
Step 2.
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WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
42C-51
STEP 2. Diagnostic trouble code recheck after resetting
CAN bus lines
Q: Is the DTC C1910, C1920, C1930, C1940, C1911, C1921,
C1931 or C1941 set?
YES (When DTC C1911, C1921, C1931 and C1941 are
set) : Go to Step 3.
YES (When DTC C1911, C1921, C1931 or C1941 is set) :
Go to Step 7.
YES (When DTC C1910, C1920, C1930, C1940, C1911,
C1921, C1931 and C1941 are set) : Replace all TPMS
transmitters, and then register the ID codes. (Refer to
P.42C-114.) Then go to Step 8.
NO : The procedure is complete.
STEP 3. Connector check: C-07 WCM connector, C-16 joint
connector, C-41 intermediate connector, and D-14 receiver
antenna assembly connector
Q: Is the check result normal?
YES : Go to Step 4.
NO : Repair or replace the difective connector, and then
register the ID codes. (Refer to P.42C-114.) Then go
to Step 8.
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42C-52
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
STEP 4. Wiring harness check between C-07 WCM
connector and D-14 receiver antenna assembly connector.
(1) Disconnect C-07 WCM connector and D-14 receiver
antenna assembly connector.
(2) Measure at the connector side of the D-14 receiver antenna
assembly.
(3) Measure the resistance between the D-14 receiver antenna
assembly terminals.
•
Terminal No.1 −body ground.
Harness side: D-14
AC709322 BY
•
Terminal No.3 −body ground.
•
Terminal No.5 −body ground.
•
Terminal No.8 −body ground.
Harness side: D-14
AC709322 BZ
Harness side: D-14
AC709322 CA
Harness side: D-14
AC709322 CB
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WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
•
Harness side: D-14
AC709322 CC
42C-53
Terminal No.12 −body ground.
OK: No continuity
Q: Is the check result normal?
YES : Go to Step 5.
NO (terminal No.1 −body ground.) : The wiring harness
between D-14 receiver antenna assembly connector
terminal No.1 and C-07 WCM connector terminal
No.1 is shorted to ground. Repair the wiring
harness.and then register the ID codes. (Refer to
P.42C-114.) Then go to Step 8.
NO (terminal No.3 −body ground.) : The wiring harness
between D-14 receiver antenna assembly connector
terminal No.3 and C-07 WCM connector terminal
No.3 is shorted to ground. Repair the wiring
harness.and then register the ID codes. (Refer to
P.42C-114.) Then go to Step 8.
NO (terminal No.5 −body ground.) : The wiring harness
between D-14 receiver antenna assembly connector
terminal No.5 and C-07 WCM connector terminal
No.5 is shorted to ground. Repair the wiring
harness.and then register the ID codes. (Refer to
P.42C-114.) Then go to Step 8.
NO (terminal No.8 −body ground.) : The wiring harness
between D-14 receiver antenna assembly connector
terminal No.8 and C-07 WCM connector terminal
No.8 is shorted to ground. Repair the wiring
harness.and then register the ID codes. (Refer to
P.42C-114.) Then go to Step 8.
NO (terminal No.12 −body ground.) : The wiring harness
between D-14 receiver antenna assembly connector
terminal No.12 and C-07 WCM connector terminal
No.12 is shorted to ground. Repair the wiring
harness.and then register the ID codes. (Refer to
P.42C-114.) Then go to Step 8.
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42C-54
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
STEP 5. Wiring harness check between C-07 WCM
connector and D-14 receiver antenna assembly connector.
(1) Disconnect C-07 WCM connector and D-14 receiver
antenna assembly connector.
(2) Measure at the connector side of C-07 WCM connector and
D-14 receiver antenna assembly connector.
(3) Measure the resistance between the terminals.
•
C-07 WCM connector terminal No.1 −D-14 receiver
antenna assembly connector terminal No.1.
Harness side: C-07
Harness side: D-14
AC709322 CI
•
C-07 WCM connector terminal No.3 −D-14 receiver
antenna assembly connector terminal No.3.
•
C-07 WCM connector terminal No.5 −D-14 receiver
antenna assembly connector terminal No.5.
•
C-07 WCM connector terminal No.8 −D-14 receiver
antenna assembly connector terminal No.8.
Harness side: C-07
Harness side: D-14
AC709322 CJ
Harness side: C-07
Harness side: D-14
AC709322 CK
Harness side: C-07
Harness side: D-14
AC709322 CL
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WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
•
Harness side: C-07
Harness side: D-14
AC709322 CM
42C-55
C-07 WCM connector terminal No.12 −D-14 receiver
antenna assembly connector terminal No.12.
OK: Continuity exists (2 ohms or less)
Q: Is the check result normal?
YES : Go to Step 6.
NO (C-07 WCM connector terminal No.1 −D-14 receiver
antenna assembly connector terminal No.1.) : An open
circuit is present in the wiring harness between C-07
WCM connector terminal No.1 and D-14 receiver
antenna assembly connector terminal No.1. Repair
the wiring harness.and then register the ID codes.
(Refer to P.42C-114.) Then go to Step 8.
NO (C-07 WCM connector terminal No.3 −D-14 receiver
antenna assembly connector terminal No.3.) : An open
circuit is present in the wiring harness between C-07
WCM connector terminal No.3 and D-14 receiver
antenna assembly connector terminal No.3. Repair
the wiring harness.and then register the ID codes.
(Refer to P.42C-114.) Then go to Step 8.
NO (C-07 WCM connector terminal No.5 −D-14 receiver
antenna assembly connector terminal No.5.) : An open
circuit is present in the wiring harness between C-07
WCM connector terminal No.5 and D-14 receiver
antenna assembly connector terminal No.5. Repair
the wiring harness.and then register the ID codes.
(Refer to P.42C-114.) Then go to Step 8.
NO (C-07 WCM connector terminal No.8 −D-14 receiver
antenna assembly connector terminal No.8.) : An open
circuit is present in the wiring harness between C-07
WCM connector terminal No.8 and D-14 receiver
antenna assembly connector terminal No.8. Repair
the wiring harness.and then register the ID codes.
(Refer to P.42C-114.) Then go to Step 8.
NO (C-07 WCM connector terminal No.12 −D-14 receiver
antenna assembly connector terminal No.12.) : An open
circuit is present in the wiring harness between C-07
WCM connector terminal No.12 and D-14 receiver
antenna assembly connector terminal No.12. Repair
the wiring harness.and then register the ID codes.
(Refer to P.42C-114.) Then go to Step 8 .
STEP 6. Receiver antenna assembly check
Register the ID codes. If the ID codes can not be registered for
all the four wheels, replace the receiver antenna assembly.
Q: Is the ID registration completed?
YES : Go to Step 8.
NO : Replace the receiver antenna assembly and register
the ID codes again (Refer to P.42C-114). Then go to
Step 8.
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42C-56
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
STEP 7. Check for TPMS transmitter.
Identify the TPMS transmitter which the DTC is set by TPMS
transmitter check (Refer to P.42C-125.)
NOTE: The TPMS transmitter which cannot be checked may
be faulty or the ID code may not be registered, thus do not
replace it, but register the ID code. If the transmitter is faulty, it
is replaced in the ID code registration process.
Q: Are there any TPMS transmitters which are identified?
YES : Among the checked TPMS transmitters, replace the
TPMS transmitters to which the DTC is set, and then
register the ID codes. (Refer to P.42C-114.) Then go
to Step 8.
NO : Even when no transmitter is checked, register the ID
codes. (Refer to P.42C-114.) Then go to Step 8.
STEP 8. Diagnostic trouble code recheck after register the
ID codes
(1) Turn the ignition switch to the "ON" position.
(2) Check if the DTC is set.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC C1911, C1921, C1931, C1941, C1914, C1924,
C1934 or C1944 set?
YES : Replace the WCM and register the ID codes (Refer to
P.42C-114). Then start over at Step 1.
NO : The procedure is complete.
DTC C1913: Acceleration sensor abnormality 1
DTC C1923: Acceleration sensor abnormality 2
DTC C1933: Acceleration sensor abnormality 3
DTC C1943: Acceleration sensor abnormality 4
DTC C1914: Pressure sensor abnormality 1
DTC C1924: Pressure sensor abnormality 2
DTC C1934: Pressure sensor abnormality 3
DTC C1944: Pressure sensor abnormality 4
CAUTION
If there is any problem in the CAN bus lines, an incorrect
diagnostic trouble code may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C,
Trouble code diagnosis P.54C-14).
.
DTC SET CONDITION
DTC C1913, C1923, C1933, C1943
• The TPMS transmitter detects if the wheel is rotated by the
acceleration sensor and sends the signals to WCM. When
the TPMS transmitter judges that the acceleration sensor is
failed, the failure signal is send to WCM, and WCM sets this
code.
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WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
42C-57
DTC C1914, C1924, C1934, C1944
• The TPMS transmitter detects if the tire pressure sensor is
normal and sends the signal to WCM. When the TPMS
transmitter judges that the tire pressure sensor is failed, the
failure signal is send to WCM, and WCM sets this code.
.
TROUBLESHOOTING HINTS
The most likely causes for this DTC to set are:
• Low battery that is incorporated into the TPMS transmitter
• Damaged wiring harness and connector
• Registered IDs unmatched
• Malfunction of TPMS transmitter
• Malfunction of WCM
DIAGNOSIS
Required Special Tools:
• MB991958 Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827 M.U.T.-III USB Cable
• MB991910 M.U.T.-III Main Harness A
STEP 1. M.U.T.-III CAN bus diagnostics
Use scan tool to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair the CAN bus lines (Refer to GROUP 54C −
CAN Bus Diagnostics table P.54C-240). On
completion, go to Step 2.
STEP 2. Diagnostic trouble code recheck after resetting
CAN bus lines
Q: Is the DTC C1913, C1923, C1933, C1943, C1914, C1924,
C1934 or C1944 set?
YES : Go to Step 3.
NO : The procedure is complete.
STEP 3. Check for TPMS transmitter.
Identify the TPMS transmitter which the DTC is set by TPMS
transmitter check (Refer to P.42B-265).
NOTE: The TPMS transmitter which cannot be checked may
be faulty or the ID code may not be registered, thus do not
replace it, but register the ID code. If the transmitter is faulty, it
is replaced in the ID code registration process.
Q: Are there any TPMS transmitters which are identified?
YES : Among the checked TPMS transmitters, replace the
TPMS transmitters to which the DTC is set. Then
register the ID codes (Refer to P.42B-265). Then go
to Step 4.
NO : Even when no transmitter is checked, register the ID
codes. (Refer to P.42C-114.) Then go to Step 4.
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42C-58
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
STEP 4. Diagnostic trouble code recheck after register the
ID codes
(1) Turn the ignition switch to the "LOCK" (OFF) position.
(2) Turn the ignition switch to the "ON" position.
(3) Check if the DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC C1913, C1923, C1933, C1943, C1914, C1924,
C1934 or C1944 set?
YES : Replace the WCM and register the ID codes (Refer to
P.42C-114). Then start over at Step 1.
NO : The procedure is complete.
DTC C1912: Tire inflation pressure warning 1
DTC C1922: Tire inflation pressure warning 2
DTC C1932: Tire inflation pressure warning 3
DTC C1942: Tire inflation pressure warning 4
CAUTION
If there is any problem in the CAN bus lines, an incorrect
diagnostic trouble code may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C,
Trouble code diagnosis P.54C-14).
.
DTC SET CONDITION
When the tire pressure included in the signal from the TPMS
transmitter is less than the specified value, WCM sets this
code.
.
TROUBLESHOOTING HINTS
The most likely causes for this DTC to set are:
• Drop of tire pressure
• Loose TPMS transmitter mounting nut
• Flat tire
• TPMS transmitter malfunction
• WCM malfunction
• CAN-bus line malfunction
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: M.U.T.-III USB Cable
• MB991910: M.U.T.-III Main Harness A
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WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
42C-59
STEP 1. M.U.T.-III CAN bus diagnostics
Use scan tool to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair the CAN bus lines (Refer to GROUP 54C −
CAN Bus Diagnostics table P.54C-14). On
completion, go to Step 2.
STEP 2. Diagnostic trouble code recheck after resetting
CAN bus lines
Q: Is DTC C1912, C1922, C1932 or C1942 set?
YES : Go to Step 3.
NO : The procedure is complete.
STEP 3. Tire check
Check that there is no abnormality for the items below.
• Flat tire
• Cracked tire
• Air leak from valve
• Loose TPMS transmitter mounting nut (Refer to
P.42C-131).
Q: Is the check result normal?
YES : Go to Step 4.
NO : Repair or replace it. Then go to Step 4.
STEP 4. Diagnostic trouble code check
(1) Turn the ignition switch to the "ON" position, and adjust the
pressure to the recommended tire pressure.
(2) Check if the DTC is set.
Q: Is DTC C1912, C1922, C1932 or C1942 set?
YES : Go to Step 5.
NO : The procedure is complete.
STEP 5. Diagnostic trouble code check
(1) Drive the vehicle for five minutes.
NOTE: Even within 5 minutes, if the TPMS warning light
goes out, finish the driving and perform the operation (2).
(2) Check if the DTC is set.
Q: Is DTC C1912, C1922, C1932 or C1942 set?
YES : Go to Step 6.
NO : The procedure is complete.
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42C-60
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
STEP 6. Tire pressure check by M.U.T.-III
(1) Perform the transmitter check using the M.U.T.-III (Refer to
P.42C-114), and check the tire pressure values of all the
wheels.
(2) Check the tire pressure of all the wheels using the tire
pressure gauge.
(3) Compare the measured value (1) with (2).
OK: 20 kPa (2.9 psi) or less
NOTE: Do not replace the TPMS transmitter which cannot
be checked.
Q: Is the check result OK?
YES : Replace the WCM and register the ID codes (Refer to
P.42C-9). Then go to Step 9.
NO : Go to Step 7.
STEP 7. Tire pressure check by M.U.T.-III
(1) Perform the transmitter check using the M.U.T.-III (Refer to
P.42C-114), and check the tire pressure values of all the
wheels.
(2) Check the tire pressure of all the wheels using the tire
pressure gauge.
(3) Compare the measured value (1) with (2).
OK: 20 kPa (2.9 psi) or less
Q: Is the check result OK?
YES : Replace the WCM and register the ID codes (Refer to
P.42C-9). Then go to Step 9.
NO : Replace the TPMS transmitter and register the ID
codes (Refer to P.42C-9). Then go to Step 8.
STEP 8. Recheck for diagnostic trouble code.
(1) Turn the ignition switch to the "LOCK" (OFF) position.
(2) Turn the ignition switch to the "ON" position.
(3) Check if the DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC C1912, C1922, C1932 or C1942 set?
YES : Replace the WCM and register the ID codes (Refer to
P.42C-9). Then go to Step 9.
NO : The procedure is complete.
STEP 9. Recheck for diagnostic trouble code.
(1) Turn the ignition switch to the "LOCK" (OFF) position.
(2) Turn the ignition switch to the "ON" position.
(3) Check if the DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC C1912, C1922, C1932 or C1942 set?
YES : Start over at Step 1.
NO : The procedure is complete.
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WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
42C-61
DTC C1915: Transmitter OFF Mode 1
DTC C1925: Transmitter OFF Mode 2
DTC C1935: Transmitter OFF Mode 3
DTC C1945: Transmitter OFF Mode 4
CAUTION
If there is any problem in the CAN bus lines, an incorrect
diagnostic trouble code may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C,
Trouble code diagnosis P.54C-14).
.
DTC SET CONDITION
When the TPMS transmitter(s) is in the OFF MODE, this code
is set.
.
TROUBLESHOOTING HINTS
The most likely causes for this DTC to set are:
• OFF mode cancellation not performed
• Damaged wiring harness and connector
• Malfunction of TPMS transmitter
• Malfunction of WCM
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: M.U.T.-III USB Cable
• MB991910: M.U.T.-III Main Harness A
STEP 1. M.U.T.-III CAN bus diagnostics
Use scan tool to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair the CAN bus lines (Refer to GROUP 54C −
CAN Bus Diagnostics table P.54C-14). On
completion, go to Step 2.
STEP 2. Diagnostic trouble code recheck after resetting
CAN bus lines
(1) Turn the ignition switch to the "LOCK" (OFF) position.
(2) Turn the ignition switch to the "ON" position.
(3) Check if the DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC C1915, C1925, C1935 or C1945 set?
YES : Go to Step 3.
NO : The procedure is complete.
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42C-62
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
STEP 3. Diagnostic trouble code check
(1) Drive the vehicle for five minutes.
(2) Turn the ignition switch to the "LOCK" (OFF) position.
(3) Turn the ignition switch to the "ON" position.
(4) Check if the DTC is set.
(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Are the all DTC C1915, C1925, C1935 and C1945 set?
YES : Replace the TPMS transmitters of all the four wheels,
and register ID codes (Refer to P.42C-9). Then go to
Step 4.
NO : Register the ID codes (Refer to P.42C-114). Then go
to Step 4.
STEP 4. Diagnostic trouble code recheck after register the
ID codes
(1) Turn the ignition switch to the "ON" position.
(2) Check if the DTC is set.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC C1915, C1925, C1935 or C1945 set?
YES : Replace the WCM and register the ID codes (Refer to
P.42C-9). Then start over at Step 1.
NO : The procedure is complete.
DTC U0019: Bus off (CAN-B)
.
CAUTION
• If DTC U0019 is set, be sure to diagnose the
CAN bus line.
• When replacing the ECU, always check that
the communication circuit is normal.
TECHNICAL DESCRIPTION(COMMENT)
If WCM cannot perform the data transmission in normal conditions due to a malfunction of the CAN-B
bus circuit, WCM determines that there is a problem.
.
.
TROUBLESHOOTING HINT
DTC SET CONDITION
If the CAN-B circuit malfunctions, the WCM sets DTC
U0019.
The CAN bus line may be defective
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: M.U.T.-III USB Cable
• MB991910: M.U.T.-III Main Harness A
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WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
42C-63
STEP 1.Recheck for diagnostic trouble code.
Check again if the DTC is set to the WCM.
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958. Refer to "How to connect the
Scan Tool (M.U.T.-III) P.42C-6."
(2) Turn the ignition switch from "LOCK" (OFF) position to "ON"
position.
(3) Check if DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Data link connector
Q: Is the DTC set?
YES : Go to Step 2.
NO : The trouble can be an intermittent malfunction (Refer
to GROUP 00 −How to use
Troubleshooting/inspection Service Points −How to
Cope with Intermittent Malfunction P.00-15).
MB991910
MB991824
MB991827
AC608435 AB
STEP 2. Using scan tool MB991958, diagnose the CAN bus
line.
(1) Turn the ignition switch to the "ON" position.
(2) Diagnose the CAN bus line.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the CAN bus line found to be normal?
YES : The trouble can be an intermittent malfunction (Refer
to GROUP 00 −How to use
Troubleshooting/inspection Service Points −How to
Cope with Intermittent Malfunction P.00-15).
NO : Repair the CAN bus line (Refer to GROUP 54C,
Diagnosis P.54C-14).
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42C-64
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
DTC U0141: ETACS-ECU CAN timeout
CAUTION
• If DTC U0141 is set, be sure to diagnose the
CAN bus line.
• When replacing the ECU, always check that
the communication circuit is normal.
DIAGNOSTIC FUNCTION
If the signal from ETACS-ECU cannot be received,
the WCM sets DTC U0141.
.
TROUBLESHOOTING HINTS
• Malfunction of CAN bus line
• Malfunction of WCM
• Malfunction of ETACS-ECU
.
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: M.U.T.-III USB Cable
• MB991910: M.U.T.-III Main Harness A
STEP 1. Using scan tool MB991958, diagnose the CAN bus
line.
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958. Refer to "How to connect the
Scan Tool (M.U.T.-III) P.42C-6."
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Data link connector
Q: Is the CAN bus line found to be normal?
YES : Go to Step 2.
NO : Repair the CAN bus line (Refer to GROUP 54C,
Diagnosis P.54C-14).
MB991910
MB991824
MB991827
AC608435 AB
STEP 2. Using scan tool MB991958, read the ETACS-ECU
diagnostic trouble code.
Check again if the DTC is set to the ETACS-ECU.
Q: Is the DTC set?
YES : Diagnose the ETACS-ECU (Refer to GROUP 54A −
ETACS, Diagnose P.54A-582).
NO : Go to Step 3.
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WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
42C-65
STEP 3. Recheck for diagnostic trouble code.
Check again if the DTC is set to the WCM.
(1) Erase the DTC.
(2) Turn the ignition switch from "LOCK" (OFF) position to "ON"
position.
(3) Check if DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?
YES : Replace WCM and register the ID codes (Refer to
P.42C-9).
NO : The trouble can be an intermittent malfunction (Refer
to GROUP 00 −How to use
Troubleshooting/inspection Service Points −How to
Cope with Intermittent Malfunction P.00-15).
DTC U0151: SRS-ECU CAN timeout
CAUTION
• If DTC U0151 is set, be sure to diagnose the
CAN bus line.
• When replacing the ECU, always check that
the communication circuit is normal.
DIAGNOSTIC FUNCTION
If no signal from SRS-ECU can be received, WCM
sets diagnostic trouble code U0151.
.
TROUBLESHOOTING HINTS
• The CAN bus line may be defective
• The SRS-ECU may be defective
• Malfunction of WCM
.
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: M.U.T.-III USB Cable
• MB991910: M.U.T.-III Main Harness A
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42C-66
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
STEP 1. Using scan tool MB991958, diagnose the CAN bus
line.
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958. Refer to "How to connect the
Scan Tool (M.U.T.-III) P.42C-6."
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Data link connector
Q: Is the CAN bus line found to be normal?
YES : Go to Step 2.
NO : Repair the CAN bus line (Refer to GROUP 54C,
Diagnosis P.54C-14).
MB991910
MB991824
MB991827
AC608435 AB
STEP 2. Using scan tool MB991958, read the SRS-ECU
diagnostic trouble code.
Check again if the DTC is set to the SRS-ECU.
Q: Is the DTC set?
YES : Troubleshoot the SRS (Refer to GROUP 52B,
Troubleshooting P.52B-31).
NO : Go to Step 3.
STEP 3. Recheck for diagnostic trouble code.
Check again if the DTC is set to the WCM.
(1) Erase the DTC.
(2) Turn the ignition switch from "LOCK" (OFF) position to "ON"
position.
(3) Check if DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?
YES : Replace WCM and register the ID codes (Refer to
P.42C-9).
NO : The trouble can be an intermittent malfunction (Refer
to GROUP 00 −How to use
Troubleshooting/inspection Service Points −How to
Cope with Intermittent Malfunction P.00-15).
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WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
42C-67
DTC U0154: Occupant classification-ECU CAN timeout
.
CAUTION
• If DTC U0154 is set, be sure to diagnose the
CAN bus line.
• When replacing the ECU, always check that
the communication circuit is normal.
TROUBLESHOOTING HINTS
• The CAN bus line may be defective.
• The WCM may be defective.
• The occupant classification-ECU may be defective.
.
DIAGNOSTIC FUNCTION
When the signals from occupant classification-ECU
cannot be received, the WCM sets DTC U0154.
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: M.U.T.-III USB Cable
• MB991910: M.U.T.-III Main Harness A
STEP 1. Using scan tool MB991958, diagnose the CAN bus
line.
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958. Refer to "How to connect the
Scan Tool (M.U.T.-III) P.42C-6."
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Data link connector
Q: Is the CAN bus line found to be normal?
YES : Go to Step 2.
NO : Repair the CAN bus line (Refer to GROUP 54C,
Diagnosis P.54C-14).
MB991910
MB991824
MB991827
AC608435 AB
STEP 2. Using scan tool MB991958, read the SRS-ECU
diagnostic trouble code.
Check if DTC is set to the SRS-ECU.
Q: Is the DTC set?
YES : Troubleshoot the SRS (Refer to GROUP 52B,
Diagnosis P.52B-297).
NO : Go to Step 3.
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42C-68
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
STEP 3. Recheck for diagnostic trouble code.
Check again if the DTC is set to the WCM.
(1) Erase the DTC.
(2) Turn the ignition switch from "LOCK" (OFF) position to "ON"
position.
(3) Check if DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?
YES : Replace WCM and register the ID codes (Refer to
P.42C-9).
NO : The trouble can be an intermittent malfunction (Refer
to GROUP 00 −How to use
Troubleshooting/inspection Service Points −How to
Cope with Intermittent Malfunction P.00-15).
DTC U0155: Combination meter CAN timeout
CAUTION
• If DTC U0155 is set, be sure to diagnose the
CAN bus line.
• When replacing the ECU, always check that
the communication circuit is normal.
TROUBLE JUDGMENT
If no signal from the combination meter can be
received, WCM sets DTC U0155.
.
TROUBLESHOOTING HINTS
• Malfunction of CAN bus line
• Combination meter malfunction
• Malfunction of WCM
.
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: M.U.T.-III USB Cable
• MB991910: M.U.T.-III Main Harness A
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WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
42C-69
STEP 1. Using scan tool MB991958, diagnose the CAN bus
line.
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958. Refer to "How to connect the
Scan Tool (M.U.T.-III) P.42C-6."
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Data link connector
Q: Is the CAN bus line found to be normal?
YES : Go to Step 2.
NO : Repair the CAN bus line (Refer to GROUP 54C,
Diagnosis P.54C-14).
MB991910
MB991824
MB991827
AC608435 AB
STEP 2. Using scan tool MB991958, read the combination
meter diagnostic trouble code.
Check if DTC is set to the combination meter.
Q: Is the DTC set?
YES : Troubleshoot the combination meter (Refer to
GROUP 54A, Diagnosis P.54A-28).
NO : Go to Step 3.
STEP 3. Recheck for diagnostic trouble code.
Check again if the DTC is set to the WCM.
(1) Erase the DTC.
(2) Turn the ignition switch from "LOCK" (OFF) position to "ON"
position.
(3) Check if DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?
YES : Replace WCM and register the ID codes (Refer to
P.42C-9).
NO : The trouble can be an intermittent malfunction such
as a poor connection or open circuit in the CAN bus
lines between the combination meter and the WCM.
(Refer to GROUP 00, How to Cope with Intermittent
Malfunction P.00-15).
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42C-70
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
DTC U0164: A/C-ECU CAN timeout
CAUTION
• If DTC U0164 is set, be sure to diagnose the
CAN bus line.
• When replacing the ECU, always check that
the communication circuit is normal.
DIAGNOSTIC FUNCTION
If the signal from A/C-ECU cannot be received, the
WCM sets DTC U0164.
.
TROUBLESHOOTING HINTS
• The CAN bus line may be defective.
• The A/C-ECU may be defective.
• The WCM may be defective.
.
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: M.U.T.-III USB Cable
• MB991910: M.U.T.-III Main Harness A
STEP 1. Using scan tool MB991958, diagnose the CAN bus
lineCAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958. Refer to "How to connect the
Scan Tool (M.U.T.-III) P.42C-6."
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Data link connector
Q: Is the CAN bus line found to be normal?
YES : Go to Step 2.
NO : Repair the CAN bus line (Refer to GROUP 54C,
Diagnosis P.54C-14).
MB991910
MB991824
MB991827
AC608435 AB
STEP 2. Using scan tool MB991958, read the A/C
diagnostic trouble code
Check if DTC is set to the A/C-ECU.
Q: Is the DTC set?
YES : Troubleshoot the A/C (Refer to GROUP 55, A/C
Diagnosis P.55-9).
NO : Go to Step 3.
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WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
42C-71
STEP 3. Recheck for diagnostic trouble code.
Check again if the DTC is set to the WCM.
(1) Erase the DTC.
(2) Turn the ignition switch from "LOCK" (OFF) position to "ON"
position.
(3) Check if DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?
YES : Replace WCM and register the ID codes (Refer to
P.42C-9).
NO : The trouble can be an intermittent malfunction (Refer
to GROUP 00 −How to use
Troubleshooting/inspection Service Points −How to
Cope with Intermittent Malfunction P.00-15).
DTC U0184: Audio CAN timeout
.
CAUTION
• If DTC U0184 is set, be sure to diagnose the
CAN bus line.
• When replacing the ECU, always check that
the communication circuit is normal.
TROUBLESHOOTING HINTS
• The CAN bus line may be defective.
• The WCM may be defective.
• The radio and CD player or CD changer may be
defective.
.
DIAGNOSTIC FUNCTION
When the signals from radio and CD player or CD
changer cannot be received, the WCM sets DTC
U0184.
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: M.U.T.-III USB Cable
• MB991910: M.U.T.-III Main Harness A
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42C-72
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
STEP 1. Using scan tool MB991958, diagnose the CAN bus
line.
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958. Refer to "How to connect the
Scan Tool (M.U.T.-III) P.42C-6."
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Data link connector
Q: Is the CAN bus line found to be normal?
YES : Go to Step 2.
NO : Repair the CAN bus line (Refer to GROUP 54C,
Diagnosis P.54C-14).
MB991910
MB991824
MB991827
AC608435 AB
STEP 2. Using scan tool MB991958, read the audio
diagnostic trouble code.
Check again if the DTC is set to the audio.
Q: Is the DTC set?
YES : Troubleshoot the radio and CD player (Refer to
GROUP 54A −Radio and CD player, Diagnosis <radio
and CD player> P.54A-288).
NO : Go to Step 3.
STEP 3. Recheck for diagnostic trouble code.
Check again if the DTC is set to the WCM.
(1) Erase the DTC.
(2) Turn the ignition switch from "LOCK" (OFF) position to "ON"
position.
(3) Check if DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?
YES : Replace WCM and register the ID codes (Refer to
P.42C-9).
NO : The trouble can be an intermittent malfunction (Refer
to GROUP 00 −How to use
Troubleshooting/inspection Service Points −How to
Cope with Intermittent Malfunction P.00-15).
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WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
42C-73
DTC U0195: Satellite radio tuner CAN timeout
CAUTION
• If DTC U0195 is set to the ETACS-ECU, always
diagnose the CAN bus line.
• Before replacing the ECU, ensure that the
communication circuit is normal.
TROUBLE JUDGMENT
If the signal from satellite radio tuner cannot be
received, the WCM sets DTC U0195.
.
TROUBLESHOOTING HINTS
• The satellite radio tuner may be defective.
• The WCM may be defective.
• The CAN bus may be defective.
.
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: M.U.T.-III USB Cable
• MB991910: M.U.T.-III Main Harness A
STEP 1. Using scan tool MB991958, diagnose the CAN bus
line.
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958. Refer to "How to connect the
Scan Tool (M.U.T.-III) P.42C-6."
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Data link connector
Q: Is the CAN bus line found to be normal?
YES : Go to Step 2.
NO : Repair the CAN bus line (Refer to GROUP 54C,
Diagnosis P.54C-14).
MB991910
MB991824
MB991827
AC608435 AB
STEP 2. Using scan tool MB991958, read the satellite radio
tuner diagnostic trouble code.
Check if DTC is set to the satellite radio tuner.
Q: Is the DTC set?
YES : Troubleshoot the satellite radio. (Refer to GROUP
54A, Diagnosis P.54A-540<Satellite radio tuner>).
NO : Go to Step 3.
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42C-74
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
STEP 3. Recheck for diagnostic trouble code.
Check again if the DTC is set to the WCM.
(1) Erase the DTC.
(2) Turn the ignition switch from "LOCK" (OFF) position to "ON"
position.
(3) Check if DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?
YES : Replace WCM and register the ID codes (Refer to
P.42C-9).
NO : The trouble can be an intermittent malfunction such
as a poor connection or open circuit in the CAN bus
lines between the satellite radio tuner and the WCM.
(Refer to GROUP 00, How to Cope with Intermittent
Malfunction P.00-15).
DTC U0197: Hands free module CAN timeout
CAUTION
• If DTC U0197 is set, be sure to diagnose the
CAN bus line.
• When replacing the ECU, always check that
the communication circuit is normal.
DIAGNOSTIC FUNCTION
When the signals from hands free module cannot be
received, the WCM sets DTC U0197.
.
TROUBLESHOOTING HINTS
• The CAN bus line may be defective.
• The WCM may be defective.
• The hands free module may be defective.
.
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: M.U.T.-III USB Cable
• MB991910: M.U.T.-III Main Harness A
TSB Revision
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
42C-75
STEP 1. Using scan tool MB991958, diagnose the CAN bus
line.
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958. Refer to "How to connect the
Scan Tool (M.U.T.-III) P.42C-6."
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Data link connector
Q: Is the CAN bus line found to be normal?
YES : Go to Step 2.
NO : Repair the CAN bus line (Refer to GROUP 54C,
Diagnosis P.54C-14).
MB991910
MB991824
MB991827
AC608435 AB
STEP 2. Using scan tool MB991958, read the hands free
module diagnostic trouble code.
Check again if the DTC is set to the hands free module.
Q: Is the DTC set?
YES : Troubleshoot the hands-free cellular phone system
(Refer to GROUP 54A −Hands-free Cellular Phone,
Diagnosis <hands-free cellular phone system>).
NO : Go to Step 3.
STEP 3. Recheck for diagnostic trouble code.
Check again if the DTC is set to the WCM.
(1) Erase the DTC.
(2) Turn the ignition switch from "LOCK" (OFF) position to "ON"
position.
(3) Check if DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?
YES : Replace WCM and register the ID codes (Refer to
P.42C-9.)
NO : The trouble can be an intermittent malfunction (Refer
to GROUP 00 −How to use
Troubleshooting/inspection Service Points −How to
Cope with Intermittent Malfunction P.00-15).
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42C-76
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
DTC U0245: Audio visual navigation unit CAN timeout
.
CAUTION
• If DTC U0245 is set, be sure to diagnose the
CAN bus line.
• When replacing the ECU, always check that
the communication circuit is normal.
TROUBLESHOOTING HINTS
• The CAN bus line may be defective.
• The WCM may be defective.
• The audio visual navigation unit may be defective.
.
DIAGNOSTIC FUNCTION
When the signals from audio visual navigation unit
cannot be received, the WCM sets DTC U0245.
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: M.U.T.-III USB Cable
• MB991910: M.U.T.-III Main Harness A
STEP 1. Using scan tool MB991958, diagnose the CAN bus
line
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958. Refer to "How to connect the
Scan Tool (M.U.T.-III) P.42C-6."
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Data link connector
Q: Is the CAN bus line found to be normal?
YES : Go to Step 2.
NO : Repair the CAN bus line (Refer to GROUP 54C,
Diagnosis P.54C-14).
MB991910
MB991824
MB991827
AC608435 AB
STEP 2. Using scan tool MB991958, read the audio visual
navigation unit diagnostic trouble code.
Check if DTC is set to the audio visual navigation unit.
Q: Is the DTC set?
YES : Troubleshoot the MMCS (Refer to GROUP 54A −
MMCS, Diagnosis <MMCS> P.54A-384).
NO : Go to Step 3.
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WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
42C-77
STEP 3. Recheck for diagnostic trouble code.
Check again if the DTC is set to the WCM.
(1) Erase the DTC.
(2) Turn the ignition switch from "LOCK" (OFF) position to "ON"
position.
(3) Check if DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?
YES : Replace WCM and register the ID codes (Refer to
P.42C-9).
NO : The trouble can be an intermittent malfunction (Refer
to GROUP 00 −How to use
Troubleshooting/inspection Service Points −How to
Cope with Intermittent Malfunction P.00-15).
DTC U1412: Implausible Vehicle Speed Signal Received
CAUTION
If there is any problem in the CAN bus lines, an incorrect
diagnostic trouble code may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C,
Trouble code diagnosis P.54C-14).
.
DTC SET CONDITION
WCM receives the wheel speed information from ASC-ECU via
the CAN-bus line. If WCM cannot receive the information about
the wheel speed sensor from ASC-ECU, this code is set.
.
TROUBLESHOOTING HINTS
The most likely causes for this DTC to set are:
• Damaged wiring harness and connector
• Malfunction of ASC-ECU
• Malfunction of WCM
• Malfunction of ETACS-ECU
DIAGNOSIS
Required Special Tools:
• MB991958 Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827 M.U.T.-III USB Cable
• MB991910 M.U.T.-III Main Harness A
STEP 1. M.U.T.-III CAN bus diagnostics
Use scan tool to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair the CAN bus lines (Refer to GROUP 54C −
CAN Bus Diagnostics table P.54C-240). On
completion, go to Step 2.
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42C-78
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
STEP 2. Diagnostic trouble code recheck after resetting
CAN bus lines
(1) Turn the ignition switch to the "LOCK" (OFF) position.
(2) Turn the ignition switch to the "ON" position.
(3) Check if the DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC U1412 set?
YES : Go to Step 3.
NO : The procedure is complete.
STEP 3. Vehicle speed check by combination meter
During the vehicle driving, check that the correct vehicle speed
is displayed on the combination meter.
Q: Is the check result normal?
YES : Replace the WCM and register ID codes (Refer to
P.42C-114). Then go to Step 6.
NO : Go to Step 4.
STEP 4. Check for other diagnostic trouble code.
Check if the diagnostic trouble code is set from ASC-ECU
(Refer to GROUP 35C, diagnostic trouble code chart
P.35C-20).
Q: Is the check result normal?
YES : Go to Step 5.
NO : Carry out the relevant troubleshooting. (Refer to
GROUP 35C, diagnostic trouble code chart
P.35C-20). Then go to Step 5.
STEP 5. Check for other diagnostic trouble code.
Check if the diagnostic trouble code is set from ETACS-ECU
(Refer to GROUP 54A, ETACS −diagnostic trouble code chart
P.54A-582).
Q: Is the check result normal?
YES : Diagnose the combination meter. (Refer to GROUP
54A, Combination meter −diagnostic trouble code
chart P.54A-28) Go to Step 6.
NO : Carry out the relevant troubleshooting. (Refer to
GROUP 54A, ETACS −diagnostic trouble code chart
P.54A-582). Then go to Step 6.
STEP 6. Recheck for diagnostic trouble code.
(1) Turn the ignition switch to the "LOCK" (OFF) position.
(2) Turn the ignition switch to the "ON" position.
(3) Check if the DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC U1412 set?
YES : Start over at Step 1.
NO : The procedure is complete.
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WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
42C-79
DTC U1415: Coding not completed/Data fail
.
CAUTION
• If DTC U1415 is set, diagnose the CAN bus
lines.
• When replacing the ECU, always check that
the communication circuit is normal.
JUDGMENT CRITERIA
With the global coding counter value "0," if all the global coding data (vehicle information) are not stored,
the WCM determines that a problem has occurred.
.
.
TROUBLESHOOTING HINTS
DIAGNOSTIC FUNCTION
If the vehicle information data is not registered to the
combination meter, the WCM sets DTC U1415.
• The CAN bus line may be defective.
• The WCM may be defective.
• The ETACS-ECU may be defective.
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: M.U.T.-III USB Cable
• MB991910: M.U.T.-III Main Harness A
STEP 1. Using scan tool MB991958, diagnose the CAN bus
line.
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958. Refer to "How to connect the
Scan Tool (M.U.T.-III) P.42C-6."
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Data link connector
Q: Is the CAN bus line found to be normal?
YES : Go to Step 2.
NO : Repair the CAN bus line (Refer to GROUP 54C,
Diagnosis P.54C-14).
MB991910
MB991824
MB991827
AC608435 AB
TSB Revision
42C-80
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
STEP 2. Using scan tool MB991958, read the ETACS-ECU
diagnostic trouble code.
Check if DTC is set to the ETACS-ECU.
Q: Is the DTC set?
YES : Troubleshoot the ETACS-ECU (Refer to GROUP 54A
−ETACS, Diagnosis P.54A-582).
NO : Go to Step 3.
STEP 3. Recheck for diagnostic trouble code.
Check again if the DTC is set to the WCM.
(1) Erase the DTC.
(2) Turn the ignition switch from "LOCK" (OFF) position to "ON"
position.
(3) Check if DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?
YES : Replace WCM and register the ID codes (Refer to
P.42C-9).
NO : The trouble can be an intermittent malfunction (Refer
to GROUP 00 −How to use
Troubleshooting/inspection Service Points −How to
Cope with Intermittent Malfunction P.00-15).
DTC U1417: Implausible coding data
CAUTION
• If diagnostic trouble code U1417 is set in WCM, always
diagnose the CAN bus lines. If there is any fault in the
CAN bus lines, an incorrect diagnostic trouble code
may be set. In this case, the set diagnostic trouble code
is not highly reliable.
• Before replacing the ECU, ensure that the communication circuit is normal.
• When diagnostic trouble code U1417 is set in WCM, the
diagnostic trouble code may also be set in ETACS-ECU.
When the diagnostic trouble code is set in ETACS-ECU,
carry out the diagnosis of the diagnostic trouble code
for ETACS-ECU first.
.
CIRCUIT OPERATION
WCM receives the vehicle information stored in the
ETACS-ECU via CAN bus lines.
.
DTC SET CONDITIONS
WCM communicates with ETACS-ECU via CAN bus lines. This
diagnostic trouble code is set when the vehicle information
received from the ETACS-ECU is invalid.
.
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WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
42C-81
PROBABLE CAUSES
• Malfunction of ETACS-ECU
• Engine control module malfunction
• ETACS-ECUs have been interchanged between two vehicles.
• WCM malfunction
• External noise interference
• WCMs have been interchanged between two vehicles.
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: M.U.T.-III USB Cable
• MB991910: M.U.T.-III Main Harness A
STEP 1. Using scan tool MB991958, diagnose the CAN bus
line.
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958. Refer to "How to connect the
Scan Tool (M.U.T.-III) P.42C-6."
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Data link connector
Q: Is the CAN bus line found to be normal?
YES : Go to Step 2.
NO : Repair the CAN bus line (Refer to GROUP 54C,
Diagnosis P.54C-14).
MB991910
MB991824
MB991827
AC608435 AB
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42C-82
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
STEP 2. Using scan tool MB991958, check for other
system diagnostic trouble code.
Check if DTC is set to the ETACS-ECU or engine control module.
Q: Is the DTC set?
YES (DTC is set to ETACS-ECU.) : Troubleshoot the
ETACS (Refer to GROUP 54A −ETACS, Diagnosis
P.54A-582).
YES (DTC is set to the engine control module.) :
Troubleshoot the MFI system (Refer to GROUP 13A −
MFI, Diagnosis P.13A-44).
NO : Go to Step 3.
STEP 3. Check part number of ETACS-ECU
Check the part number of ETACS-ECU.
OK: 8637A313
Q: Is the check result normal?
YES : Go to Step 4.
NO : Replace ETACS-ECU.
STEP 4. Check part number of WCM
Check the part number of WCM.
OK: MN141352
Q: Is the check result normal?
YES : Go to Step 5.
NO : Replace WCM and register the ID codes (Refer to
P.42C-9).
STEP 5. Recheck for diagnostic trouble code.
Check again if the DTC is set to the WCM.
(1) Erase the DTC.
(2) Turn the ignition switch from "LOCK" (OFF) position to "ON"
position.
(3) Check if DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?
YES : Replace WCM and register the ID codes (Refer to
P.42C-9).
NO : The trouble can be an intermittent malfunction (Refer
to GROUP 00 −How to use
Troubleshooting/inspection Service Points −How to
Cope with Intermittent Malfunction P.00-15).
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42C-83
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
DATA LIST REFERENCE TABLE
M1427501000034
Item No.
Scan tool MB991958
display
Check conditions
Normal conditions
01
Received key data(ID)
−
Key ID for stored ignition key
02
Received key
data(button)
−
Switch display of transmitter
13
Number of registered
IMMOB.key
−
Number of stored ignition keys
(Number of registered ignition
keys that can start the engine)
21
Air pressure, Tire 1
−
−
22
Air pressure, Tire 2
23
Air pressure, Tire 3
24
Air pressure, Tire 4
25*
Air pressure, Tire 5
31
Acceleration, Tire 1
−
−
32
Acceleration, Tire 2
33
Acceleration, Tire 3
34
Acceleration, Tire 4
35*
Acceleration, Tire 5
36
Threshold of PRS.
warning
The tire pressure is within the
specified value range.
OFF
The tire pressure is not within
the specified value range.
ON
The tire pressure is within the
specified value range.
ON
The tire pressure is not within
the specified value range.
OFF
−
Number of stored TPMS
37
Threshold of PRS.
warning release
38
Number of registered
TPMS ID
39
Ignition signal(CAN data) Ignition switch status
information received from
ETACS-ECU via CAN:ON
Ignition switch status
information received from
ETACS-ECU via CAN:OFF
40
Ignition signal(Port input) Ignition switch: ON
ON
OFF
ON
Ignition switch: OFF
OFF
41
VSS
Drive the vehicle
The scan tool and the
speedometer readings are
approximately the same
50
Registered ID reception,
Tier1
Ignition switch: ON
Yes
Ignition switch: OFF
No
Registered ID reception,
Tier2
Ignition switch: ON
Yes
Ignition switch: OFF
No
51
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42C-84
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
Item No.
Scan tool MB991958
display
Check conditions
Normal conditions
52
Registered ID reception,
Tier3
Ignition switch: ON
Yes
Ignition switch: OFF
No
Registered ID reception,
Tier4
Ignition switch: ON
Yes
Ignition switch: OFF
No
Registered ID reception,
Tier5
Ignition switch: ON
Yes
Ignition switch: OFF
No
61
Air pressure, Tire1(not
adjusted)
−
−
62
Air pressure, Tire2(not
adjusted)
63
Air pressure, Tire3(not
adjusted)
64
Air pressure, Tire4(not
adjusted)
65*
Air pressure, Tire5(not
adjusted)
53
54*
NOTE: * shows that it is displayed but not used.
TROUBLE SYMPTOM CHART
M1427500400169
CAUTION
During diagnosis, a DTC associated with other system may be set when the ignition switch is turned
on with connector(s) disconnected. On completion, check all systems for DTC(s). If DTC(s) are set,
erase them all.
Trouble symptom
Inspection
procedure
number
Reference
page
Scan tool cannot communicate with WCM.
1
P.42C-85
The ignition key cannot be registered using scan tool.
2
P.42C-86
Engine does not start (cranking but no initial combustion).
3
P.42C-88
Abnormality in WCM power supply and ground circuits.
4
P.42C-90
Keyless entry system does not work.
5
P.42C-93
Keyless entry hazard light answerback function, the dome light answerback
function or the horn answerback function does not work normally.
6
P.42C-102
The timer lock function does not work after doors have been unlocked by the 7
keyless entry system.
P.42C-104
The trunk is not opened when the keyless entry transmitter "TRUNK" button
is operated.
P.42C-105
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8
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
42C-85
SYMPTOM PROCEDURES
Inspection Procedure 1: Scan tool cannot communicate with WCM.
.
CAUTION
Before replacing the ECU, ensure that the communication circuit is normal.
.
TECHNICAL DESCRIPTION (COMMENT)
If the M.U.T.-III cannot communicate with the WCM,
the CAN bus lines may be defective. If the WCM
does not work, the WCM or the power supply circuit
may be defective.
TROUBLESHOOTING HINTS
• Malfunction of the power supply or ground of
WCM
• Malfunction of CAN bus line
• Malfunction of WCM
DIAGNOSIS
Required Special Tools:
• MB991958 Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827 M.U.T.-III USB Cable
• MB991910 M.U.T.-III Main Harness A
STEP 1. Using scan tool MB991958, diagnose the CAN bus
line.
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958. Refer to "How to connect the
Scan Tool (M.U.T.-III) P.42C-6."
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Data link connector
Q: Is the CAN bus line found to be normal?
YES : Go to Step 2.
NO : Repair the CAN bus line (Refer to GROUP 54C,
Diagnosis P.54C-14).
MB991910
MB991824
MB991827
AC608435 AB
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42C-86
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
STEP 2. Check the power supply circuit and the ground
circuit to WCM.
Refer to Inspection Procedure 4 "Abnormality in WCM power
supply and ground circuits." P.42C-90.
Q: Is the power supply circuit and the ground circuit to
WCM in good condition ?
YES : Go to Step 3.
NO : Repair the power supply circuit and the ground circuit
to WCM.
STEP 3. Retest the system
Check if scan tool can communicate with WCM.
Q: Does the scan tool communicate with WCM?
YES : The trouble can be an intermittent malfunction (Refer
to GROUP 00 −How to use
Troubleshooting/inspection Service Points −How to
Cope with Intermittent Malfunction P.00-15).
NO : Replace WCM and register the ID codes (Refer to
P.42C-9).
Inspection Procedure 2: The ignition key cannot be registered using scan tool.
.
.
TECHNICAL DESCRIPTION (COMMENT)
TROUBLESHOOTING HINTS
If only some ignition keys cannot be registered, the
ignition key itself may be faulty. If no ignition key can
be registered, the key assembly may have already
been registered for another vehicle, or the WCM may
be faulty.
•
•
•
•
Malfunction of the ignition key
Damaged wiring harness and connectors
Malfunction of WCM
Ignition key registered for other vehicle
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: M.U.T.-III USB Cable
• MB991910: M.U.T.-III Main Harness A
STEP 1. Check the ignition key inserted in the key cylinder
for interference.
Q: Are there other ignition keys or anything that interferes
with the communication (things that generate radio
waves such as magnets and an air-cleaning device that
has a power plug) near the ignition key inserted in the
key cylinder?
YES : Move away or remove other ignition keys or things
that interfere with the communication (things that
generate radio waves such as magnets and a
air-cleaning device that has a power plug) near the
ignition key. Then, go to step 2.
NO : Go to Step 3.
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WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
42C-87
STEP 2. Retest the system
Check that the ignition key can be registered.
Q: Is the ignition key that cannot be registered using scan
tool?
YES : Go to Step 3.
NO : The procedure is complete.
STEP 3. Check which ignition key cannot be registered.
Q: Can any one of the ignition keys be registered?
YES (Only some keys) : Replace the key that cannot be
registered and register the ID codes (Refer to
P.42C-9). After registering the ID codes, go to Step 5 .
NO (All keys) : Go to Step 4.
STEP 4. Retest the system
Check the scan tool screen when the key was not able to be
registered.
Q: Is the error message of scan tool screen "Abnormality
in key" ?
YES (Abnormality in key) : Carry out DTC B1A25: Key ID
unmatched and DTC B1A35: Transponder read error
(Refer to P.42C-23 <B1A25>, P.42C-27 <B1A35>).
Then, go to Step 5 .
NO (ECU internal error) : Replace WCM and register the
ID codes (Refer to P.42C-9).
STEP 5. Retest the system
Check that the ignition key can be registered.
Q: Is the ignition key that cannot be registered using scan
tool?
YES : Replace WCM and register the ID codes (Refer to
P.42C-9).
NO : The procedure is complete.
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42C-88
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
Inspection Procedure 3: Engine does not start (cranking but no initial combustion).
.
TECHNICAL DESCRIPTION (COMMENT)
If the fuel injection does not work, WCM and the MFI
system may have a problem. This symptom is not
considered abnormal when the engine is started by
an ignition key that has not been registered.
.
TROUBLESHOOTING HINTS
•
•
•
•
•
•
Malfunction of battery
Malfunction of the MFI system
Malfunction of WCM
Malfunction of CAN bus line
Malfunction of the transponder
VIN not programmed
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: M.U.T.-III USB Cable
• MB991910: M.U.T.-III Main Harness A
STEP 1. Check the battery voltage.
Measure the battery voltage when cranking.
• The voltage should measure 8 volt or more.
Q: Is the measured voltage 8 volt or more?
YES : Go to Step 2.
NO : Check the battery (Refer to GROUP 54A −Battery test
P.54A-9).
STEP 2. Using scan tool MB991958, diagnose the CAN bus
line.
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958. Refer to "How to connect the
Scan Tool (M.U.T.-III) P.42C-6."
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Data link connector
Q: Is the CAN bus line found to be normal?
YES : Go to Step 3.
NO : Repair the CAN bus line (Refer to GROUP 54C,
Diagnosis P.54C-14).
MB991910
MB991824
MB991827
AC608435 AB
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WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
42C-89
STEP 3. Using scan tool MB991958, check for MFI system
diagnostic trouble code.
Check if DTC is set to the engine control module.
Q: Is the DTC set?
YES : Troubleshoot the MFI system (Refer to GROUP 13A,
Diagnosis P.13A-44).
NO : Go to Step 4.
STEP 4. Using scan tool MB991958, check for WCM
diagnostic trouble code.
Check if DTC is set to the WCM.
Q: Is the DTC set?
YES : Troubleshoot the WCM (Refer to P.42C-6).
NO : Go to Step 5.
STEP 5. Check that the engine starts.
Q: Does the engine start?
YES : The procedure is complete.
NO : Refer to GROUP 13A , Diagnosis P.13A-44. When
the cause of the failure cannot be tracked down by the
troubleshooting in GROUP 13A, replace WCM and
register the ID codes (Refer to P.42C-9).
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42C-90
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
Inspection Procedure 4: Abnormality in WCM power supply and ground circuits.
CAUTION
Before replacing the ECU, ensure that the power
supply circuit, the ground circuit and the communication circuit are normal.
WCM Power Supply Circuit
ETACSECU
IG1
RELAY
WCM
IMMOBILIZER
ANTENNA
Connector: C-07
Connector: C-317
Junction block
C-07
AC708972AB
AC708951CD
.
TECHNICAL DESCRIPTION (COMMENT)
If the WCM does not work at all or if the WCM cannot
communicate with the scan tool, the WCM power
supply or the ground circuit may be defective.
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WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
42C-91
• Malfunction of the WCM
.
TROUBLESHOOTING HINTS
• Damaged wiring harness and connectors
DIAGNOSIS
Required Special Tools:
• MB992006: Extra fine probe
• MB991223: Harness set
STEP 1. Check WCM connector C-07 and ETACS-ECU
connector C-317 for loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Q: Is the WCM connector C-07 and ETACS-ECU connector
C-317 in good condition?
YES : Go to Step 2.
NO : Repair the defective connector.
STEP 2. Check the wiring harness between WCM
connector C-07 (terminal No.6, 9) and the ETACS-ECU
connector C-317 (terminal No.10, 5) for open circuit.
(1) Disconnect WCM connector C-07 and ETACS-ECU
connector C-317, and check the wiring harness.
(2) Check the wiring harness between WCM connector C-07
(terminal No.6) and ETACS-ECU connector C-317 (terminal
No.10)
OK: Continuity exists (2 Ω or less)
Harness side: C-07
Harness side: C-317
AC709707EQ
(3) Check the wiring harness between WCM connector C-07
(terminal No.9) and ETACS-ECU connector C-317 (terminal
No.5)
OK: Continuity exists (2 Ω or less)
Harness side: C-317
Harness side: C-07
AC709707ER
Q: Is the wiring harness between WCM connector C-07 and
the ETACS-ECU connector C-317 in good condition?
YES : Go to Step 3.
NO : Repair the wiring harness between WCM connector
C-07 (terminal No.6, 9) and ETACS-ECU connector
C-317 (termuinal No.10, 5).
TSB Revision
42C-92
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
STEP 3. Check the wiring harness between the WCM
connector C-07 (terminal No.7) and the ground for open
circuit.
(1) Disconnect WCM connector C-07, and check the wiring
harness.
(2) Check the wiring harness between WCM connector C-07
(terminal No.7) and ground.
OK: Continuity exists (2 Ω or less)
Harness side: C-07
Q: Is the wiring harness between WCM connector C-07 and
the ground in good condition?
YES : Go to Step 4.
NO : Repair the wiring harness between WCM connector
C-07 (terminal No.7) and ground.
AC709707ES
STEP 4. Retest the system
Q: Does the abnormality in WCM power supply and ground
circuits in good condition?
YES : The trouble can be an intermittent malfunction (Refer
to GROUP 00, How to use
Troubleshooting/inspection Service Points - How to
Cope with Intermittent Malfunction P.00-15).
NO : Replace WCM and register the ID codes (Refer to
P.42C-9).
TSB Revision
42C-93
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
Inspection Procedure 5: Keyless entry system does not work.
CAUTION
Before replacing the ECU, ensure that the power
supply circuit, the ground circuit and the communication circuit are normal.
Wireless Control Module System Input Signal
RECEIVER
ANTENNA
ASSEMBLY
KEYLESS
ENTRY
TRANSMITTER
GREEN
-RED
RED
REDWHITE
BROWN
-WHITE
YELLOW
-GREEN
GREEN
-RED
RED
REDWHITE
BROWN
-WHITE
YELLOW
-GRAY
RECEIVER
YELLOW
-GRAY
BROWN
-WHITE
REDWHITE
RED
GREEN
-RED
JOINT
CONNECTOR (6)
WIRELESS
CONTROL
MODULE
AC709290 AB
Connectors: C-07, C-16
Connector: C-41
C-16 (B)
C-07
AC708951AY
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AC708950BA
42C-94
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
.
TROUBLESHOOTING HINTS
Connector: D-14
•
•
•
•
•
•
•
•
AC708955AM
.
TECHNICAL DESCRIPTION (COMMENT)
The receiver antenna assembly receives the
lock/unlock signals from the transmitter, and sends
them to the WCM, and further to the ETACS-ECU.
Then, the ETACS-ECU receives the signals of the
key reminder switch and all door switches, then activates the keyless entry system.
The CAN bus line may be defective
The key reminder switch may be defective
The door switches may be defective
The keyless entry transmitter may be defective
The receiver antenna assembly may be defective
The WCM may be defective
The ETACS-ECU may be defective
The wiring harness or connectors may have
loose, corroded, or damaged terminals, or terminals pushed back in the connector
• Option coding information
DIAGNOSIS
Required Special Tools:
• MB992006: Extra fine probe
• MB991223: Harness set
• MB991958 Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: Vehicles Communication Interface (V.C.I.)
• MB991827 M.U.T.-III USB Cable
• MB991910 M.U.T.-III Main Harness A
TSB Revision
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
42C-95
STEP 1. Using scan tool MB991958, check for CAN bus the
diagnostic trouble code.
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958. Refer to "How to connect
scan tool (M.U.T.-III) P.42C-6."
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Data link connector
Q: Is the CAN bus line found to be normal?
YES : Go to Step 2.
NO : Repair the CAN bus line (Refer to GROUP 54C,
Diagnosis P.54C-14).
MB991910
MB991824
MB991827
AC608435 AB
TSB Revision
42C-96
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
STEP 2. Using scan tool MB991958, read the diagnostic
trouble code.
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958. Refer to "How to connect
scan tool (M.U.T.-III) P.42C-6."
(2) Turn the ignition switch to the "ON" position.
(3) Check whether the WCM related DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Data link connector
Q: Is the DTC set?
YES : Diagnose the WCM. Refer to Diagnostic trouble code
chart P.42C-14.
NO : Go to Step 3.
MB991910
MB991824
MB991827
AC608435 AB
STEP 3. Check the power supply system
With the ignition switch in the LOCK (OFF) position, check if
the following function operates normally:
• Headlights
• Hazard warning light
Q: Is the check result normal?
YES : Go to Step 4.
NO : Refer to GROUP 54A −Malfunction of ETACS-ECU
power supply circuit P.54A-636.
STEP 4. Verify the central door locking system.
Check that the central door locking system works normally.
Q: Is the check result normal?
YES : Go to Step 5.
NO : Refer to GROUP 42A −Troubleshooting P.42A-30.
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42C-97
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
STEP 5. Using scan tool MB991958, check data list.
Check the signals related to the keyless entry system operation.
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958. Refer to "How to connect the
Scan Tool (M.U.T.-III) P.42C-6."
(2) Turn the ignition switch to the "LOCK" (OFF) position.
(3) Check the ETACS data list.
• Close the driver's door.
• Close the passenger's door.
• Close the RH-side rear door.
• Close the LH-side rear door.
• Close the trunk lid.
• Remove the ignition key from the ignition key cylinder.
Data link connector
MB991910
MB991824
MB991827
AC608435 AB
Item No.
Item name
Normal
condition
Item 256
Dr door ajar switch
Close
Item 257
As door ajar switch
Close
Item 258
RR door ajar switch
Close
Item 259
RL door ajar switch
Close
Item 260
Trunk/gate trunk ajar switch Close
Item 264
Handle lock switch
Key in →Key out
OK: Normal condition are displayed.
TSB Revision
42C-98
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
Q: Are the check result normal?
YES <Normal conditions are displayed for all the
items.> : Go to Step 6.
NO <Normal condition is not displayed for item No.
256.> : Refer to GROUP 54A, Inspection Procedure 5:
ETACS-ECU does not receive any signal from the
front door switch (LH) P.54A-656.
NO <Normal condition is not displayed for item No.
257.> : Refer to GROUP 54A, Inspection Procedure 6:
ETACS-ECU does not receive any signal from the
front door switch (RH) P.54A-654.
NO <Normal condition is not displayed for item No.
258.> : Refer to GROUP 54A, Inspection Procedure 8:
ETACS-ECU does not receive any signal from the
rear door switch (RH) P.54A-661.
NO <Normal condition is not displayed for item No.
260.> : Refer to GROUP 54A, Inspection Procedure 9:
ETACS-ECU does not receive any signal from the
trunk lid latch. P.54A-663.
NO <Normal condition is not displayed for item No.
264.> : Refer to GROUP 54A, Inspection Procedure 3:
ETACS-ECU does not receive any signal from the key
reminder switch. P.54A-644.
STEP 6. Using scan tool MB991958, check pulse check.
Check the signals related to the keyless entry system operation.
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958. Refer to "How to connect the
Scan Tool (M.U.T.-III) P.42C-6."
(2) Confirm the ETACS pulse check.
• Remove the ignition key from the ignition key cylinder.
Data link connector
Item name
Conditions
Transmitter switch
Turn the switch ON/OFF.
OK: The scan tool (M.U.T.-III) tone alarm sounds.
Q: Is the check result normal?
YES : Go to Step 7.
NO : Refer to "Signals from transmitter switches are not
received P.42C-111."
MB991910
MB991824
MB991827
AC608435 AB
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WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
42C-99
STEP 7. Check receiver antenna assembly connector D-14
and WCM connector C-07 for loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Q: Is the receiver antenna assembly connector D-14 and
WCM connector C-07 in good condition?
YES : Go to Step 8.
NO : Repair the defective connector.
TSB Revision
42C-100
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
STEP 8. Check the wiring harness between the receiver
antenna assembly connector D-14 (terminal Nos. 1, 3 and
5) and the WCM connector C-07 (terminal Nos. 1, 3 and 5)
for open circuit.
(1) Disconnect receiver antenna assembly connector D-14 and
WCM connector C-07, and check the wiring harness.
(2) Check the wiring harness between receiver antenna
assembly connector D-14 (terminal No.1) and WCM
connector C-07 (terminal No.1).
OK: Continuity exists (2 Ω or less)
Harness side: D-14
Harness side: C-07
AC709707HW
(3) Check the wiring harness between receiver antenna
assembly connector D-14 (terminal No.3) and WCM
connector C-07 (terminal No.3).
OK: Continuity exists (2 Ω or less)
Harness side: D-14
Harness side: C-07
AC709707 HX
(4) Check the wiring harness between receiver antenna
assembly connector D-14 (terminal No.5) and WCM
connector C-07 (terminal No.5).
OK: Continuity exists (2 Ω or less)
Harness side: D-14
Harness side: C-07
AC709707HY
Q: Is the wiring harness between receiver antenna
assembly connector D-14 (terminal Nos. 1, 3 and 5) and
the WCM connector C-07 (terminal Nos. 1, 3 and 5) in
good condition?
YES : Go to Step 9.
NO (receiver antenna assembly connector D-14 terminal
No.1 −WCM connector C-07 terminal No.1.) : Repair the
wiring harness between receiver antenna assembly
connector D-14 (terminal No.1) and WCM connector
C-07 (terminal No.1).
NO (receiver antenna assembly connector D-14 terminal
No.3 −WCM connector C-07 terminal No.3.) : Repair the
wiring harness between receiver antenna assembly
connector D-14 (terminal No.3) and WCM connector
C-07 (terminal No.3).
NO (receiver antenna assembly connector D-14 terminal
No.5 −WCM connector C-07 terminal No.5.) : Repair the
wiring harness between receiver antenna assembly
connector D-14 (terminal No.5) and WCM connector
C-07 (terminal No.5).
TSB Revision
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
42C-101
STEP 9. Check the wiring harness between the receiver
antenna assembly connector D-14 (terminal Nos. 1, 3 and
5) and the ground for short circuit.
(1) Disconnect receiver antenna assembly connector D-14,
and check the wiring harness.
(2) Check the wiring harness between receiver antenna
assembly connector D-14 (terminal No.1) and ground
OK: No continuity
Harness side: D-14
AC709707FZ
(3) Check the wiring harness between receiver antenna
assembly connector D-14 (terminal No.3) and ground
OK: No continuity
Harness side: D-14
AC709707FW
(4) Check the wiring harness between receiver antenna
assembly connector D-14 (terminal No.5) and ground
OK: No continuity
Harness side: D-14
AC709707FV
Q: Is the wiring harness between receiver antenna
assembly connector D-14 (terminal Nos. 1, 3 and 5) and
the ground in good condition?
YES : Go to Step 10.
NO (receiver antenna assembly connector D-14 terminal
No.1 −ground.) : Repair the wiring harness between
receiver antenna assembly connector D-14 (terminal
No.1) and the ground.
NO (receiver antenna assembly connector D-14 terminal
No.3 −ground.) : Repair the wiring harness between
receiver antenna assembly connector D-14 (terminal
No.3) and the ground.
NO (receiver antenna assembly connector D-14 terminal
No.5 −ground.) : Repair the wiring harness between
receiver antenna assembly connector D-14 (terminal
No.5) and the ground.
TSB Revision
42C-102
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
STEP 10. Retest the system.
Replace the receiver antenna assembly. Check if the keyless
entry system works normally.
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP 00, How to
Use Troubleshooting/Inspection Service Points - How
to Cope with Intermittent Malfunction P.00-15).
NO : Replace WCM and register the ID codes (Refer to
P.42C-9).
Inspection Procedure 6: Keyless entry hazard light answerback function, the dome light answerback
function or the horn answerback function does not work normally.
.
CAUTION
Before replacing the ECU, ensure that the power
supply circuit, the ground circuit and the communication circuit are normal.
.
TECHNICAL DESCRIPTION (COMMENT)
If the hazard warning light and the dome light works
normally, ETACS-ECU may be faulty. Also, the
answerback function may have been disabled using
the customization function.
TROUBLESHOOTING HINTS
•
•
•
•
•
The turn signal lights may be defective
The dome light may be defective
The horn may be defective
The ETACS-ECU may be defective
The wiring harness or connectors may have
loose, corroded, or damaged terminals, or terminals pushed back in the connector
DIAGNOSIS
STEP 1. Verify the operation hazard warning light.
Check that the hazard warning light illuminate normally.
Q: Is the check result normal?
YES : Go to Step 2.
NO : Refer to GROUP 54A −inspection procedure 1:
"Hazard warning light does not illuminate P.54A-266."
STEP 2. Verify the operation of the dome light.
Check that the dome lights illuminate normally.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Refer to GROUP 54A −inspection procedure 1 "The
front dome light does not illuminate normally
P.54A-243." or inspection procedure 2 "The rear
dome light does not illuminate normally P.54A-248."
STEP 3. Verify the horn.
Check that the horn normally.
Q: Is the check result normal?
YES : Go to Step 4.
NO : Replace the horn (Refer to GROUP 54A, Horn
P.54A-268).
TSB Revision
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
42C-103
STEP 4. Check the operation of the keyless entry system.
Operate the transmitter and check that all doors lock and
unlock.
Q: Is the check result normal?
YES : Go to Step 5.
NO : Refer to inspection procedure 5: "Keyless entry
system does not work P.42C-93."
STEP 5. Check the customize function (Hazard light
answerback).
Check that any one of the followings other than "Lock: 0,
Unlock: 0" is set for "Hazard answerback" with a customization
function.
• Lock:1, Unlock:2
• Lock:1, Unlock:0
• Lock:0, Unlock:2
• Lock:2, Unlock:1
• Lock:2, Unlock:0
• Lock:0, Unlock:1
Q: Is the check result normal?
YES : Go to Step 6.
NO : Set "Hazard answerback" to any one other than
"Lock: 0, Unlock: 0" with a customization function
(Refer to P.42C-126).
STEP 6. Check the customize function (Horn answerback).
Check that any one of the followings other than "Not sound
horn" is set for "Horn chirp by keyless" with a customization
function.
• Lock any time
• W lock any time
Q: Is the check result normal?
YES : Go to Step 7.
NO : Set "Horn chirp by keyless" to any one other than "Not
sound horn" with a customization function (Refer to
P.42C-126).
STEP 7. Check of the troubles
Check if the keyless entry answerback function works normally.
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP 00, How to
Use Troubleshooting/Inspection Service Points - How
to Cope with Intermittent Malfunction P.00-15).
NO : Replace ETACS-ECU.
TSB Revision
42C-104
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
Inspection Procedure 7: The timer lock function does not work after the doors have been unlocked by
the keyless entry system.
.
CAUTION
Before replacing the ECU, ensure that the power
supply circuit, the ground circuit and the communication circuit are normal.
.
TECHNICAL DESCRIPTION (COMMENT)
If the timer lock function does not work normally, the
keyless entry transmitter input signal circuit or
ETACS-ECU may be faulty.
TROUBLESHOOTING HINTS
• The keyless entry transmitter may be defective
• The ETACS-ECU may be defective
• The wiring harness or connectors may have
loose, corroded, or damaged terminals, or terminals pushed back in the connector
DIAGNOSIS
STEP 1. Check the operation of the keyless entry system.
Operate the transmitter and check that all doors lock and
unlock.
Q: Is the check result normal?
YES : Go to Step 2.
NO : Refer to inspection procedure 5: "Keyless entry
system does not work P.42C-93."
STEP 2. Check the customize function.
The "Timer lock timer" has been set to one of the followings
with the customization function. Check if the doors are locked
at the set period.
• 30sec
• 60sec
• 120sec
• 180sec
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP 00 −How to
Use Troubleshooting/Inspection Service Points - How
to Cope with Intermittent Malfunction P.00-15).
NO : Replace ETACS-ECU.
TSB Revision
42C-105
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
Inspection Procedure 8: The trunk is not opened when the keyless entry transmitter "TRUNK" button
is operated.
CAUTION
Before replacing the ECU, ensure that the power
supply circuit, the ground circuit and the communication circuit are normal.
Transmitter "TRUNK" Input Signal
ETACS-ECU
TRUNK
LID OPEN
RELAY
CAN DRIVE
CIRCUIT
BLACK
-BLUE
WHITE
-BLUE
JOINT
CONNECTOR
(CAN1)
REDWHITE
GREEN
REDWHITE
REDBLACK
YELLOW
-GREEN
INTERFACE
CIRCUIT
TRUNK LID
LATCH
REDWHITE
REDWHITE
BLACK
YELLOW
-GREEN
YELLOW YELLOW
-GRAY
-GRAY
RED
RED
BROWN
-WHITE
GREEN
-RED
GREEN
-RED
JOINT
CONNECTOR
(6)
BLACK
BROWN
-WHITE
BROWN
-WHITE
REDWHITE
RED
GREEN
-RED
WIRELESS
CONTROL
MODULE
RECEIVER
ANTENNA
ASSEMBLY
RECEIVER
INPUT SIGNAL
TRANSMITTER"TRUNK"BUTTON
AC708974 AB
TSB Revision
42C-106
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
Connectors: F-19, F-27
Connector: C-311
ETACS-ECU
F-27
F-19
AC708970AD
AC708972AC
.
TECHNICAL DESCRIPTION (COMMENT)
Connector: D-17
The receiver antenna assembly receives the trunk
signals from the transmitter, and sends them to the
WCM, and further to the ETACS-ECU. Then the
ETACS-ECU determines to actuate the trunk open
function of the keyless entry system.
.
D-17 (BR)
TROUBLESHOOTING HINTS
•
•
•
•
•
AC708955AL
The keyless entry transmitter may be defective
The receiver antenna assembly may be defective
The WCM may be defective
The ETACS-ECU may be defective
The wiring harness or connectors may have
loose, corroded, or damaged terminals, or terminals pushed back in the connector
DIAGNOSIS
Required Special Tools:
• MB992006: Extra fine probe
• MB991223: Harness set
• MB991958 Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: Vehicles Communication Interface (V.C.I.)
• MB991827 M.U.T.-III USB Cable
• MB991910 M.U.T.-III Main Harness A
STEP 1. Check the operation of the keyless entry system.
Operate the transmitter and check that all doors lock and
unlock.
Q: Is the check result normal?
YES : Go to Step 2.
NO : Refer to inspection procedure 5: "Keyless entry
system does not work P.42C-93."
TSB Revision
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
42C-107
STEP 2. Using scan tool MB991958, check for diagnostic
trouble code.
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958. Refer to "How to connect
scan tool (M.U.T.-III) P.42C-6."
(2) Turn the ignition switch to the "ON" position.
(3) Check whether the WCM related DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Data link connector
Q: Is the DTC set?
YES : Diagnose the WCM. Refer to Diagnostic trouble code
chart P.42C-14.
NO : Go to Step 3.
MB991910
MB991824
MB991827
AC608435 AB
TSB Revision
42C-108
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
STEP 3. Using scan tool MB991958, check pulse check.
Check the signals related to the keyless entry system operation.
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958. Refer to "How to connect the
Scan Tool (M.U.T.-III) P.42C-6."
(2) Confirm the ETACS pulse check.
• Remove the ignition key from the ignition key cylinder.
Data link connector
Item name
Conditions
Transmitter switch
Turn the switch ON/OFF.
OK: The scan tool (M.U.T.-III) tone alarm sounds.
Q: Is the check result normal?
YES : Go to Step 4.
NO : Refer to "Signals from transmitter switches are not
received P.42C-111."
MB991910
MB991824
MB991827
AC608435 AB
STEP 4. Check trunk lid latch connector F-19 and
ETACS-ECU connector C-311 for loose, corroded or
damaged terminals, or terminals pushed back in the
connector.
Q: Is trunk lid latch connector F-19 and ETACS-ECU
connector C-311 in good condition?
YES : Go to Step 5.
NO : Repair or replace the damaged component(s). Refer
to GROUP 00E, Harness Connector Inspection
P.00E-2.
TSB Revision
42C-109
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
STEP 5. Check the trunk lid latch assembly.
Remove the trunk lid latch assembly. Refer to GROUP 42A,
Trunk lid removal and installation P.42A-147.
Lever position
Battery
connection
Lever operation
At the "LOCK"
position
• Connect
terminal No.2
and the
negative
battery
terminal.
• Connect
terminal No.3
and the
positive battery
terminal.
The lever moves
from the "LOCK"
position to the
"UNLOCK"
position.
Q: Is the trunk lid latch normal?
YES : Go to Step 6.
NO : Replace the trunk lid latch assembly.
STEP 6. Check the ground circuit to the trunk lid latch.
Measure the resistance at trunk lid latch connector F-19.
(1) Disconnect trunk lid latch connector F-19 and measure the
resistance available at the wiring harness side of the
connector.
(2) Measure the resistance value between terminal 2 and
ground.
• The resistance should be 2 ohms or less.
Connector F-19
(harness side)
Q: Is the measured resistance 2 ohms or less?
YES : Go to Step 9.
NO : Go to Step 7.
AC209731
AC208731CD
TSB Revision
42C-110
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
STEP 7. Check the wiring harness between the trunk lid
latch connector F-19 (terminal No. 2) and the ground for
open circuit.
(1) Disconnect trunk lid latch connector F-19 and ground, and
check the wiring harness.
(2) Check the wiring harness between trunk lid latch connector
F-19 (terminal No. 2) and ground.
OK: Continuity exists (2 Ω or less)
Connector F-19
(harness side)
Q: Is the wiring harness between trunk lid latch connector
F-19 (terminal No. 2) and ground in good condition?
YES : Go to Step 8.
NO (trunk lid latch connector F-19 terminal No. 2 −
ground.) : Repair the wiring harness between trunk lid latch
connector F-19 (terminal No. 2) and ground.
AC209731
AC208731CD
STEP 8. Check the wiring harness between the trunk lid
latch connector F-19 (terminal No. 2) and the ground for
open circuit.
(1) Disconnect trunk lid latch connector F-19 and ground, and
check the wiring harness.
(2) Check the wiring harness between trunk lid latch connector
F-19 (terminal No. 2) and ground.
OK: Continuity exists (2 Ω or less)
Connector F-19
(harness side)
Q: Is the wiring harness between trunk lid latch connector
F-19 (terminal No. 2) and ground in good condition?
YES : Go to Step 11.
NO (trunk lid latch connector F-19 terminal No. 2 −
ground.) : Repair the wiring harness between trunk lid latch
connector F-19 (terminal No. 2) and ground.
AC209731
AC208731CD
STEP 9. Check the wiring harness between the trunk lid
latch connector F-19 (terminal No. 3) and the ETACS-ECU
connector C-311 (terminal No. 1) for open circuit.
(1) Disconnect trunk lid latch connector F-19 and ETACS-ECU
connector C-311, and check the wiring harness.
(2) Check the wiring harness between trunk lid latch connector
F-19 (terminal No. 3) and ETACS-ECU connector C-311
(terminal No. 1).
OK: Continuity exists (2 Ω or less)
Harness side: F-19
Harness side: C-311
AC709707HP
Q: Is the wiring harness between trunk lid latch connector
F-19 (terminal No. 3) and ETACS-ECU connector C-311
(terminal No. 1) in good condition?
YES : Go to Step 10.
NO (trunk lid latch connector F-19 terminal No. 3 −
ETACS-ECU connector C-311 terminal No. 1.) : Repair
the wiring harness between trunk lid latch connector
F-19 (terminal No. 3) and ETACS-ECU connector
C-311 (terminal No. 1).
TSB Revision
42C-111
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
STEP 10. Check the wiring harness between the trunk lid
latch connector F-19 (terminal No. 3) and the ground for
short circuit.
(1) Disconnect trunk lid latch connector F-19, and check the
wiring harness.
(2) Check the wiring harness between trunk lid latch connector
F-19 (terminal No. 3) and ground
OK: No continuity
Connector F-19
(harness side)
Q: Is the wiring harness between trunk lid latch connector
F-19 (terminal No. 3) and the ground in good condition?
YES : Go to Step 11.
NO (trunk lid latch connector F-19 terminal No. 3 −
ground.) : Repair the wiring harness between trunk lid latch
connector F-19 (terminal No. 3) and ground.
AC209731
AC208731CK
STEP 11. Check of the troubles
Operate the transmitter and check that the trunk lid can be
opened.
Q: Is the check result normal?
YES : The diagnosis is complete.
NO : Replace the ETACS-ECU. When the ETACS-ECU is
replaced, register the keyless ID. Refer to P.42C-114.
The trunk lid can be opened by means of the
transmitter.
INPUT SIGNAL REFERENCE TABLE
M1427504700021
Trouble symptom
Reference page
Signals from transmitter switches are not received.
P.42C-111
INPUT SIGNAL PROCEDURES
Signals from transmitter switches are not received.
.
CAUTION
Before replacing the ECU, ensure that the power
supply circuit, the ground circuit and the communication circuit are normal.
.
TECHNICAL DESCRIPTION (COMMENT)
Input signal from the keyless entry transmitter is
used to operate the keyless entry system. If the signal is abnormal, the keyless entry system will not
work normally.
TSB Revision
TROUBLESHOOTING HINTS
• Battery discharged in the transmitter
• Malfunction of the transmitter
• Malfunction of WCM
42C-112
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
DIAGNOSIS
Required Special Tools:
• MB992006: Extra fine probe
• MB991223: Harness set
• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: Vehicles Communication Interface (V.C.I.)
• MB991827: M.U.T.-III USB Cable
• MB991910: M.U.T.-III Main Harness A
STEP 1. Using scan tool MB991958, read the diagnostic
trouble code.
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958. Refer to "How to connect
scan tool (M.U.T.-III) P.42C-6."
(2) Turn the ignition switch to the "ON" position.
(3) Check whether the WCM related DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Data link connector
Q: Is the DTC set?
YES : Diagnose the WCM. Refer to Diagnostic Trouble
Code Chart P.42C-14.
NO : Go to Step 2.
MB991910
MB991824
MB991827
AC608435 AB
STEP 2. Check the transmitter battery.
Measure the voltage of the transmitter battery.
• The value should be approximately 2.5 - 3.2 volts.
Q: Is the measured voltage approximately 2.5 - 3.2 volts?
YES : Go to Step 3.
NO : Replace the battery. If the transmitter can be
registered normally, and operates normally, it
indicates that the transmitter is sending normal signal
to the WCM.
AC004486
TSB Revision
42C-113
WIRELESS CONTROL MODULE (WCM)
DIAGNOSIS
STEP 3. Register the keyless ID using a known-good
transmitter of the same type again, and check the trouble
symptom.
(1) Register a known-good transmitter of the same type.
(2) Check if the signals from the transmitter switches are
received.
Q: Can the transmitter be registered correctly?
YES : Replace the original transmitter with a new one.
NO : Replace the WCM (Including when the new
transmitter cannot be registered). Replace WCM and
register the ID codes (Refer to P.42C-114). If the
transmitter works normally, the input signal from the
transmitter should be normal.
CHECK AT ECU TERMINALS
M1427500900120
C-07
AC507349AH
Terminal
No.
Check item
Check condition
Normal condition
1
Receiver antenna assembly
CLOCK output
Ignition key lock button, unlock
button, and trunk lid button: ON
0 to 5 V (pulse signal)
2
−
−
−
3
Receiver antenna assembly DATA
output
Ignition key lock button, unlock
button, and trunk lid button: ON
0 to 5 V (pulse signal)
4
−
−
−
5
Receiver antenna assembly power
control
Ignition switch: OFF
0 to 5 V (pulse signal)
6
Power supply (Battery)
Always
Battery voltage
7
Ground
Always
0V
8
Receiver antenna assembly ground Always
0V
9
Power supply (Ignition switch: IG1) Ignition switch: ON
Battery voltage
10
CAN L
−
−
11
CAN H
−
−
12
Receiver antenna assembly power
supply
Always
5V
TSB Revision
42C-114
WIRELESS CONTROL MODULE (WCM)
ON-VEHICLE SERVICE
ON-VEHICLE SERVICE
ID CODES REGISTRATION PROCEDURE
M1427506300234
REGISTRATION USING SCAN TOOL MB991958
(M.U.T.-III SUB ASSEMBLY)
Required Special Tools:
• MB991958 Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827 M.U.T.-III USB Cable
• MB991910 M.U.T.-III Main Harness A
The ID codes necessary for the engine immobilizer system, the
keyless entry system and the TPMS can be registered using
the scan tool MB991958 (M.U.T.-III sub assembly). KOS and
keyless operation key are indicated as F.A.S.T and F.A.S.T.-key
respectively in the scan tool MB991958 (M.U.T.-III sub assembly) screen.
CAUTION
Do not register the ignition key registered for other vehicles.
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42C-115
WIRELESS CONTROL MODULE (WCM)
ON-VEHICLE SERVICE
SUPPLY UNIT LIST FOR INDIVIDUAL KEY
Ignition key
AC609713
KEY SUPPLY UNIT LIST FOR OTHER THAN INDIVIDUAL KEY
Full service key set
Handle lock service key set
AC609714
AC709684
Door service key set
NOTE: Key (It is the key that comes with the door
service key set. It can only be used for locking
and unlocking, and it cannot start the engine.)
AC607881
AC610062
NOTE: .
• When re-registering the key (key ID and keyless ID), all the
keys (key ID and keyless ID) registered before must be
re-registered because all of them will be erased.
• If the registration fails, repeat from the start.
• After registering the keys, make sure that the engine is
started normally with all of the keys registered.
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42C-116
WIRELESS CONTROL MODULE (WCM)
ON-VEHICLE SERVICE
Screen flow of scan tool MB991958 (M.U.T.-III sub assembly)
Special
Function
Key
Registration *1
Key &
F.A.S.T.-key
Registration *2
Additional key
registration *1
Password input
Password input
Password input
OK
OK
Key registration
ENG key code
& VIN Reg. *1, *2
Key Registration
(Barcode No.) *1
Refer to GROUP 00
How to Perform
VIN Writing
OK
Key ID input
Key registration
OK
OK
Go to A
Completion and
an addition?
Cancel
Special
Function
OK
Completion and
an addition?
Cancel
F.A.S.T.-key
registration
Executing
OK
F.A.S.T.-key
registration
completed
Execution
check
OK
Barcode No.
registration
completed
OK
Special
Function
OK
Registration
result display
NOTE:
*1 Show the menu displayed when the vehicles for WCM.
*2 Show the menu displayed when the vehicles for KOS.
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AC710587AB
42C-117
WIRELESS CONTROL MODULE (WCM)
ON-VEHICLE SERVICE
NOTE:
*1 Show the menu displayed when the vehicles for WCM.
*2 Show the menu displayed when the vehicles for KOS.
A
Comm.
Test *2
Steering lock
unit Reg.*2
Keyless ID
Reg.*1
Password input
OK
Keyless ID
registration
Executing
OK
Keyless ID
registration
Completed
OK
Password input
Antenna select
OK
OK
Steering lock
unit registration
Executing
Steering lock
unit registration
Completed
Tire Pressure
Sensor Check *1,*2
Tire Pressure
Sensor ID
Registration *1,*2
Antenna
communication
test Executing
Antenna
communication
test Completed
Registration
result display
ID Registration
Menu
Select &
OK
ID Registration
Executing
Can
Check
cel
OK
Tire Pressure
Sensor ID
Check *1,*2
Sensor Check
OK
Sensor Check
Executing
Check
Cancel
OK
Can
ID Registration cel
Executing
Sensor Check
Executing
ID Registration
Completed
Sensor Check
Completed
OK
ID Check
Cancel
OK
ID Registration
Menu
Sensor Check
Result Display
ID Registration
Can Cancel Check
cel
OK
Sensor Check
Can Cancel Check
cel
OK
ID Registration
Cancel
Completed
OK
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AC611443AE
42C-118
WIRELESS CONTROL MODULE (WCM)
ON-VEHICLE SERVICE
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
Connect the scan tool to the 16-pin data link connector as follows.
NOTE: For details on how to use the scan tool, refer to the
"M.U.T.-III User's Manual."
1. Start the scan tool MB991958 system on the personal
computer and turn the ignition switch to the "ON" position.
Data link connector
MB991910
MB991824
MB991827
AC608435 AB
System Select
System List
1
Model Year
MPI/GDI/Diesel
2
Up to 2005 MY
From to 2006 MY
F.A.S.T./IMMO/Keyless/TPMS
Vehicle Information
Model Name
Model Year
Model Code
3
AT/CVT/A-MT
4
ABS/ASC/ASTC
5
SAS
6
7
Multi Select 4WD
SRS Airbag
8
A/C
Loading Option Setup
OPC Option Name With Option
VF2 IMMOBI & Keyless & TPMS
9
ETACS
VF3 IMMOBI & F.A.S.T. & TPMS
10
Meter
2. Select "F.A.S.T./IMMO/Keyless/TPMS" button from the
"System Select" screen. Then, select the applicable option
code item and push the OK button.
3. Select "Special Function" on the next screen.
Select Model Year and System
OK button
AC609809 AB
Option: When IMMOBI & Keyless & TPMS is selected
System Select F.A.S.T./IMMO/Keyless/TPMS
Special Function
Key Registration
Additional key registration
Key Registration (Barcode No.)
ENG key code & VIN Reg.
Keyless ID Reg.
Tire Pressure Sensor ID Registration
Tire Pressure Sensor ID Check
Tire Pressure Sensor Check
Please select function.
AC709283AB
4. Select the button of the operation to be performed from the
"Special Function" screen.
• "Key Registration": When the ignition key is replaced or
added as a single unit and/or the WCM replaced.
• "Additional key registration": When the ignition key is added
as a single unit.
• "Key Registration (Barcode No.)": When the ignition key is
replaced by the full service key set, the handle lock service
key set, immobi and keyless key assembly or immobilizer
key assembly is replaced by the piece.
• "Keyless ID Reg.": When the ignition key is replaced or
added as a single unit and the immobi and keyless key
assembly.
• "Tire Pressure Sensor ID Registration": When the TPMS
transmitter is replaced and/or the WCM is replaced.
• "Tire Pressure Sensor Check": When the tire pressure sensor data is checked.
• "Tire Pressure Sensor ID Check": When the tire pressure
sensor ID is checked.
NOTE: For "ENG Key Code & VIN Reg," refer to GROUP
00 −Precautions before Service P.00-27.
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WIRELESS CONTROL MODULE (WCM)
ON-VEHICLE SERVICE
42C-119
5. After operation check, turn the ignition switch to the "LOCK"
(OFF) position.
6. Remove the scan tool MB991958.
.
"KEY REGISTRATION"/"ADDITIONAL KEY
REGISTRATION" METHOD
F.A.S.T./IMMO/Keyless/ TPMS Special Function
Keyless ID Registration
OK button
AC610088AB
Cancel button
AC509787AB
1. When "Key registration" or "Additional key registration"
screen is displayed, enter the password for the key
registration and press the OK button. Then, "Executing!" is
displayed and the registration process starts.
NOTE: .
• If the wrong password is entered consecutively 5 times,
the password entry for the key registration will be disabled for 16 minutes.
• The key registration cannot be cancelled during the
operation.
2. When the key registration is completed, "Completed" is
displayed. To register the next key, follow the message on
the screen and press the OK button. Then, "Executing!" is
displayed again and the registration process for the next key
starts. To finish the key registration, press the cancel button.
NOTE: .
• In order to register another key consecutively after registering the first key, the ignition switch must be turned to
the ON position with the second key within 30 seconds
after turning it to the "LOCK" (OFF) position with the first
key.
• Up to eight keys can be registered.
• When the key cannot be registered using scan tool
MB991958, refer to Inspection Procedure 2 "The ignition
key cannot be registered using scan tool P.42C-86.
.
"KEY REGISTRATION (BARCODE NO.)" METHOD
F.A.S.T./IMMO/Keyless/ TPMS Special Function
1. When "Key Registration (Barcode No.)" screen is displayed,
enter the password for the key registration and press the OK
button.
NOTE: If the wrong password is entered consecutively 5
times, the password entry for the key registration will be disabled for 16 minutes.
Key Registration (Barcode No.)
OK button
AC610089AB
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42C-120
WIRELESS CONTROL MODULE (WCM)
ON-VEHICLE SERVICE
F.A.S.T./IMMO/Keyless/ TPMS Special Function
Key Registration (Barcode No.)
AC709688
2. Follow the message on the screen to enter the bar code No.,
and then press the OK button.
3. When "Do you want to start registration?" is displayed, press
the OK button to start the registration, or press the Cancel
button to cancel the registration.
4. "Key Registration was completed" is displayed. Press the
OK button to finish the registration.
NOTE: When the key cannot be registered using scan tool
MB991958, refer to Inspection Procedure 2 "The ignition key
cannot be registered using scan tool P.42C-86.
Barcode
AC502858 AC
.
"KEYLESS ID REG." METHOD
F.A.S.T./IMMO/Keyless/ TPMS Special Function
1. On the "Keyless ID Reg." screen, enter the password and
press the OK button.
Keyless ID Registration
OK button
AC610066AB
2. Register within 1 minute and send the programming packet*
to register the keyless ID. To register multiple keys, register
the next key within 1 minute from the registration operation
of previous key. Complete the registration of necessary
keys, then press the OK button to finish the keyless ID
registration.
NOTE: .
• Up to eight ignition keys can be registered.
• *: Programming packet sending procedure
Complete the following steps 1 to 3 within four seconds.
1. Press and hold both the lock and the unlock switch
for 1 second or longer.
2. Release both the lock and the unlock switch for 0.5
second or longer.
3. Press the unlock switch.
3. Push the OK button after "Keyless ID Registration was
finished." is displayed.
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WIRELESS CONTROL MODULE (WCM)
ON-VEHICLE SERVICE
42C-121
4. Check number of the keyless IDs registered.
F.A.S.T./IMMO/Keyless/ TPMS Special Function
Keyless ID Registration
Work of registration
Item
Registered No. Status
Keyless ID Registration
Completed
Password
Check the number of registration.
AC610067
.
"TIRE PRESSURE SENSOR ID REGISTRATION"
METHOD
1. Select "4tires ID Reg. (Change tire PRS.)" and start the tire
pressure sensor ID registration.
CAUTION
Register all tire pressure sensor IDs within twenty minutes.
2. "4 SNSR ID Registration Do you want to start? Note Finish
ID Registration within 20 minutes." is displayed. Then, press
"OK."
NOTE: If the ID code registration is not finished within 20
minutes, all the ID codes registered in the TPMS transmitter
before will be erased. For this reason, the ID codes need to
be registered again.
3. Decrease the tire pressure to 174 kPa (25.2 psi) or less by
changing 20 kPa (2.9 psi) or more, and register the TPMS
transmitter ID code of each wheel to WCM.
NOTE: .
• You can start out the operations from any TPMS transmitter. The tire pressure sensor ID registration has no
order.
• On completion of the TPMS transmitter ID code registration, the TPMS transmitter ID code is displayed on the
M.U.T.-III screen.
• M.U.T.-III cannot identify which registered TPMS transmitter is used for each wheel. For this reason, write down
the tire number for each wheel when the tire number and
ID code is displayed on the scan tool during ID code registration.
• It may take approximately one minute for the ID code to
be displayed on the M.U.T.-III screen after the tire pressure is reduced.
• If the ID code is not displayed, reduce the tire pressure
another 20 kPa (2.9 psi) or more. If the ID code is not
displayed yet, rotate the tire to displace the TPMS transmitter, and reduce the tire pressure 20 kPa (2.9 psi) or
more again.
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42C-122
WIRELESS CONTROL MODULE (WCM)
ON-VEHICLE SERVICE
• If the ID code cannot be registered for all the four
wheels, the wiring harness or connector between the
receiver antenna assembly and the WCM, the receiver
antenna assembly or the WCM may be faulty. In this
case, check DTC as DTC from WCM may be set. (Refer
to P.42C-14.)
• If the ID code can be registered for one wheel or more,
the TPMS transmitter in which the code cannot be registered may be faulty, thus replace that TPMS transmitter.
4. "4 SNSR ID Registration Completed." is displayed. Then,
select "OK."
NOTE: The TPMS indicator illuminates for tire pressure
alarm.
5. After one minute or more has passed, correct the tire
pressure for all wheels with ignition switch "ON".
6. Check the data list "Registered ID reception, Tire 1, 2, 3, 4" if
"YES" is displayed for each tire. When "NO" is displayed,
drive the vehicle for approximately 5 minutes, check the
display again. If "NO" is still displayed, register the ID code
again.
.
"TPMS TRANSMITTER CHECK" METHOD
According to the following procedures, identify which registered
TPMS transmitter corresponds to which wheel, and check the
tire pressure and acceleration value of each TPMS transmitter.
1. Check the data list "Air Pressure, Tire1, 2, 3, 4" and write
down the tire pressure for all wheels.
NOTE: The display at this time is the data received most
recently.
2. Perform the following procedures for four wheels in order,
identify the wheel by checking the tire pressure of each
wheel.
(1) Change the pressure of tire for 20 kPa (2.9 psi) or more
so that the TPMS transmitter sends the latest sensor data
(The tire pressure can either be decreased or increased).
(2) Check the data list screen to determine which tire number
corresponds to the wheel whose tire pressure has
changed.
NOTE: .
• It may take approximately one minute that the data of
tire pressure change is displayed on the M.U.T.-III
screen.
• If the data of tire pressure change is not displayed on
the M.U.T.-III screen, the most possible cause is that
the radio wave sent from the TPMS transmitter cannot
be received. In this case, the radio wave may be
received by performing the procedures from (1) again
after turning the tire to change the TPMS transmitter
position. If the tire pressure change is still not displayed on the M.U.T.-III screen, the TPMS transmitter
in which the ID code is not registered may be
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WIRELESS CONTROL MODULE (WCM)
ON-VEHICLE SERVICE
42C-123
installed, or the TPMS transmitter may be faulty.
Therefore, perform ID code registration or replace the
TPMS transmitter according to the instructions of
troubleshooting for DTCs. (At this time, do not register
the ID codes or replace the TPMS transmitter.)
3. Check the tire pressure or acceleration value shown in the
screen (if needed).
4. After checking by the tire pressure change, adjust the
checked tire pressure to the proper value.
.
"TIRE PRESSURE SENSOR ID CHECK" METHOD
1. Select "Tire Pressure Sensor ID Check".
2. Check the registered TPMS transmitter IDs on the M.U.T.-III
screen.
REGISTRATION NOT USING SCAN TOOL
MB991958 (M.U.T.-III SUB ASSEMBLY) <USA
ONLY>
When the ignition key is lost or additional keys are requested,
the ignition key must be used to register key ID.
Multi information display
(Immobilizer indicator)
AC610195 AB
CAUTION
Two ignition keys that have been registered are needed.
1. Turn the ignition switch to the "ON" position using the
registered ignition key and keep it there for 5 seconds.
2. Turn the ignition switch to the "LOCK" (OFF) position, and
remove the registered ignition key.
3. Within 30 seconds after the ignition key is removed, insert
the other registered ignition key that has already been
registered and turn the ignition switch to the "ON" position.
4. The immobilizer indicator starts flashing in approximately 10
seconds after the ignition switch is turned to the "ON"
position.
5. When the immobilizer indicator starts flashing, turn the
ignition switch to the "LOCK" (OFF) position and remove the
ignition key.
NOTE: When an error occurs while the immobilizer indicator
is flashing, the immobilizer indicator extinguishes.
6. Within 30 seconds after the immobilizer indicator flashes in
Step 5, insert the ignition key to be added and turn the
ignition switch to the "ON" position.
7. When registering another ignition key, repeat the procedure
from the beginning.
NOTE: .
<When the additional ignition key cannot be registered>
• When the immobilizer indicator is not illuminated during registration
• When the immobilizer indicator does not change in 3 seconds after carrying out step 6
.
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42C-124
WIRELESS CONTROL MODULE (WCM)
ON-VEHICLE SERVICE
<When the additional registeration of the ignition key terminates automatically>
• When 30 seconds have passed before inserting the ignition
key in Step 3 after the ignition key is removed in Step 2.
• When 30 seconds have passed after the immobilizer indicator flashed
KEYLESS ID NOT USING SCAN TOOL MB991958
(M.U.T.-III SUB ASSEMBLY) <USA ONLY>
When the keyless ID code is already registered in the transmitter, the keyless ID code can be registered without using the
scan tool MB991958 (M.U.T.-III sub assembly) according to the
following procedures.
1. Prepare all the transmitters for ID code registration before
starting the operation.
2. Press the unlock button of the transmitter in which the
keyless ID code is registered.
3. After pressing the unlock button, press the lock button within
4 seconds to less than 10 seconds.
4. Release the lock button within 10 seconds after pressing it.
5. Release the unlock button 0.5 seconds after releasing the
lock button.
NOTE: The WCM erases the keyless ID codes of the transmitters other than the operated transmitter.
NOTE: The WCM sets the transmitter registration number to
1.
6. When the operations from Step 1 to Step 4 are completed,
the door can be locked or unlocked, and the mode shifts to
the customer-programming mode. Within 1 minute after the
mode shifted to the customer-programming mode, the signal
for registration is transmitted from the transmitter to be
added.
NOTE: How to transmit the transmitter registration signal
.
1. Press the lock button and the unlock button of the transmitter to be added for 1 second or more simultaneously.
2. Release the lock button and the unlock button simultaneously.
3. After releasing the lock button and unlock button simultaneously, when 0.5 seconds or more has elapsed, press
the unlock button.
NOTE: The WCM receives the registration signal, and
stores the keyless ID code of the transmitter.
NOTE: The WCM adds the transmitter registration number
by 1.
7. When the operation of Step 5 is finished, the door can be
locked or unlocked to notify that the transmitter registration
is completed.
8. To register another transmitter, repeat the operation of Step
5 within 1 minute after the previous transmitter registration.
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WIRELESS CONTROL MODULE (WCM)
ON-VEHICLE SERVICE
42C-125
9. The customer-programming mode is terminated by any of
the following conditions.
• When the registration of 8 transmitters are completed
• When 1 minute has elapsed without registration after the
shift to the customer-programming mode
• when 1 minute has elapsed after previous transmitter registration
• When the engine speed is more than 200 rpm
• The EEPROM abnormality occurs [When the EEPROM
abnormality occurs during the transmitter registration,
delete all the transmitters stored (including the transmitters
used for the shift to the customer-programming mode), and
finish the customer-programming mode.]
TPMS TRANSMITTER CHECK
M1427509000027
Refer to ID codes registration procedure P.42B-265.
TPMS TRANSMITTER ID CHECK
M1427509100024
Refer to ID codes registration procedure P.42B-265.
KEYLESS ENTRY SYSTEM CHECK
M1427505600050
Check the keyless entry system as described below. If it does
not work, perform troubleshooting. Refer to P.42C-84.
• Operate the transmitter to check that the doors can be
locked and unlocked.
• Operate the transmitter to check that the answerback function works in response to doors locking/unlocking.
NOTE: The hazard answerback setting can be changed
using the customization function. Confirm which setting is
activated before performing these checks. Refer to
P.42C-126.
INSPECTION OF KEYLESS ENTRY TIMER LOCK
FUNCTION
M1427505800032
Attempt to unlock the doors by using the transmitter. If the
doors are not locked within 30 seconds, carry out diagnosis.
Note that the doors will not be locked if the ignition key is
inserted within the 30-second period, or the doors are opened.
Refer to P.42C-84.
NOTE: The operation time of the keyless entry timer lock function can be set using the customization function. Confirm the
operation time before performing the diagnosis. Refer to
P.42C-126.
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42C-126
WIRELESS CONTROL MODULE (WCM)
ON-VEHICLE SERVICE
CUSTOMIZATION FUNCTION
By operating the ETACS system or MMCS of scan
tool MB991958, the following functions can be programmed. The programmed information is held even
when the battery is disconnected.
Adjustment
Adjustment item
Adjusting contents
item (scan tool
(scan tool MB991958
MB991958
display)
display)
Hazard answer
back
Adjustment of the
Lock:1, Unlock:2
number of keyless
hazard warning light Lock:1, Unlock:0
answer back
Lock:0, Unlock:2
flashes
Lock:2, Unlock:1
Dome light
Adjustment of
delay timer with interior light delay
door
shutdown time
Door unlock
mode
Auto door
unlock by P
position
Door lock system
M1427504500191
Adjusting contents
LOCK: Flashes once, UNLOCK: Flashes
twice (default)
LOCK: Flashes once, UNLOCK: No flash
LOCK: No flash, UNLOCK: Flash twice
LOCK: Flash twice, UNLOCK: Flash once
Lock:2, Unlock:0
LOCK: Flash twice, UNLOCK: No flash
Lock:0, Unlock:1
LOCK: No flash, UNLOCK: Flash once
Lock:0, Unlock:0
No function
0 sec
0 second (no delay shutdown time)
7.5 sec
7.5 seconds
15 sec
15 seconds
30 sec
30 seconds (default)
60 sec
60 seconds
120 sec
120 seconds
180 sec
180 seconds
All doors unlock
All the doors are unlocked when the
driver's side door is unlocked.
Dr door unlock
Only the driver's side door is unlocked
when the driver's side door is unlocked.
(default)
Auto door unlock by Disable
P position function Always enabled
<Vehicles with
TC-SST>
Duration of horn Horn sounding time Short
chirp
during horn answer Long
back
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No function (default)
Always with function
0.01 second (default)
0.02 second
WIRELESS CONTROL MODULE (WCM)
ON-VEHICLE SERVICE
42C-127
Adjustment
Adjustment item
item (scan tool
MB991958
display)
Adjusting contents
(scan tool MB991958
display)
Adjusting contents
Horn chirp by
keyless
Horn chirp by
keyless entry
system <vehicles
without auto light>
Not sound horn
No horn answerback function
Lock any time
The horn sounds when the lock button of
keyless entry transmitter is pressed once.
W lock any time
The horn sounds when the lock button of
keyless entry transmitter is pressed twice.
(default)
Horn chirp by
keyless entry
system <vehicles
with auto light>
Not sound horn
No horn answerback function
Lock any time
The horn sounds when the lock button of
keyless entry transmitter is pressed once.
Lock/auto ON
During daytime, while the lighting switch is
in the AUTO position, the horn sounds
once when the lock is pressed once.
W lock any time
The horn sounds when the lock button of
keyless entry transmitter is pressed twice.
(default)
30 sec
30 seconds (default)
60 sec
60 seconds
120 sec
120 seconds
180 sec
180 seconds
Disable
No function
Enable
With function (default)
Timer lock timer Timer lock period
adjustment
Panic alarm
switch
With/without panic
alarm function
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42C-128
WIRELESS CONTROL MODULE (WCM)
WCM
WCM
REMOVAL AND INSTALLATION
M1427500800219
CAUTION
When WCM has been replaced, all key ID codes should be registered, referring to the ID code registration necessity judgment table P.42C-9.
Section A-A
2
B
2
C
B
C
3
Claw
Section B-B
2
3
Claw
A
A
Section C-C
4
2
2.0 ± 0.5 N·m
18 ± 4 in-lb
3
1
Claw
AC706388
3
NOTE: Claw position is symmetrical
1.
2.
AC708360AC
Removal steps
Ignition key cover
Steering column upper cover
3.
>>A<< 4.
Removal steps (Continued)
Steering column lower cover
WCM
INSTALLATION SERVICE POINT
.
>>A<< WCM INSTALLATION
Check that the top claw of WCM is fixed securely to the boss of
steering lock and the antenna is not floated on the key cylinder.
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42C-129
WIRELESS CONTROL MODULE (WCM)
TRANSMITTER
TRANSMITTER
DISASSEMBLY AND ASSEMBLY
M1427506100036
Post-installation operation
• Transmitter operation check
2
3
4
1
AC405679AC
<<A>>
1.
2.
Disassembly steps
Upper cover
Transmitter assembly
<<B>>
>>A<<
3.
4.
Disassembly steps (Continued)
Battery
Master key
DISASSEMBLY SERVICE POINTS
.
<<A>> UPPER COVER REMOVAL
CAUTION
To prevent damage to the transmitter, wrap a flat-tipped
screwdriver with protective tape before prying.
Insert a flat-tipped screwdriver in the area shown, and remove
the upper cover by prying it with the screwdriver.
Transmitter
.
Flat-tipped screwdriver
AC405681AC
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42C-130
WIRELESS CONTROL MODULE (WCM)
TRANSMITTER
<<B>> BATTERY REMOVAL
Transmitter assembly
CAUTION
• Do not allow water or dust to enter the inside of the
transmitter assembly when it is open. Also, do not
touch the precision electronic device.
• To prevent damage to the transmitter assembly, wrap a
flat-tipped screwdriver with protective tape before prying.
Insert a flat-tipped screwdriver in the area shown, and remove
the battery by prying it with the screwdriver.
Flat-tipped screwdriver
AC405682AC
ASSEMBLY SERVICE POINT
.
>>A<< BATTERY INSTALLATION
CAUTION
Do not allow water or dust to enter the inside of the transmitter assembly when it is open. Also, do not touch the
precision electronic device.
Install a new battery to the transmitter assembly with its (+) side
facing towards the master key side.
Battery required for replacement: Coin type battery
CR1620
Transmitter assembly
–
+
Master key
side
Upper
cover
side
Battery
AC405680 AC
INSPECTION
M1427506200022
TRANSMITTER BATTERY CHECK
Measure the voltage of the battery. If the voltage of the battery
is lower than the standard value, replace the battery.
Standard value:2.5 −3.2 V
AC004486
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42C-131
WIRELESS CONTROL MODULE (WCM)
TPMS TRANSMITTER
TPMS TRANSMITTER
REMOVAL AND INSTALLATION
M1427509300017
CAUTION
• Do not vary the angle of valve except at mounting on the rim. If varying the angle over and over, it
may cause breakage of antenna plate resulting in the failure of TPMS transmitter.
• Ensure valve cap is always in place except when adjusting tire pressure.
• If the valve core and valve cap are replaced, use a genuine replacement part. The valve core is
similar to a conventional one, but uses nickel plating to avoid corrosion.
• Replace the seal and seal washer with a new one every five years or when the tire is replaced.
• Do not drop the TPMS transmitter from height greater than 1 meter (3.3 feet).
• Do not expose the TPMS transmitter to extraneous magnetic fields.
• TPMS transmitter should not be stored at temperatures above 80° C (176° F).
• TPMS transmitter should not be exposed to temperatures above 100° C (212° F).
• If the TPMS transmitter is replaced, execute "Tire Pressure Sensor ID Registration" on scan tool
MB991958 "Special Function."
• Be careful not to damage the TPMS transmitter.
Pre-removal Operation
• Wheel and Tire Removal
Post-installation Operation
• Wheel and Tire Installation
• Tire Pressure Sensor ID Registration If a new TPMS
transmitter is installed (Refer to P.42C-9).
• After the tire pressure sensor ID registration, check that
the TPMS warning light does not illuminate or flash.
6
4
2
N5
0.25 N·m
2.5 in-lb
3
8.0 ± 0.5 N·m
71 ± 4 in-lb
1
AC610443 AB
<<A>>
<<A>>
1.
2.
Removal steps
Cap
Valve core
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<<A>>
3.
•
Removal steps (Continued)
Nut
Let TPMS transmitter fall into
tire
42C-132
WIRELESS CONTROL MODULE (WCM)
TPMS TRANSMITTER
•
4.
5.
6.
<<B>>
<<C>>
<<C>>
>>A<<
>>A<<
>>A<<
>>A<<
>>B<<
>>C<<
>>C<<
6.
5.
4.
3.
•
2.
•
•
1.
Removal steps (Continued)
Tire bead
TPMS transmitter
Seal
Seal washer
Installation steps
Seal washer
Seal
TPMS transmitter
Nut
Tire bead mounting
Valve core
Tire pressure inflation
Valve nut retightening
Cap
REMOVAL SERVICE POINTS
.
<<A>> CAP/VALVE CORE/NUT REMOVAL
CAUTION
Ensure cap is always in place except when adjusting tire
pressure.
1. Remove the cap and valve core to deflate the tire.
2. Once tire pressure is released, remove nut and let TPMS
transmitter fall into tire.
.
<<B>> TPMS TRANSMITTER REMOVAL
CAUTION
Be careful not to damage the TPMS transmitter.
1. Place on tire changing machine and break both tire beads
ensuring that the TPMS transmitter remains in the bottom of
the tire.
2. Lubricate tire well and remove outer side of the tire.
3. Reach inside the tire and remove the TPMS transmitter.
4. Remove tire from rim using proper tire changing equipment
procedures.
TPMS
transmitter
AC611412AB
.
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WIRELESS CONTROL MODULE (WCM)
TPMS TRANSMITTER
42C-133
<<C>> SEAL/SEAL WASHER REMOVAL
CAUTION
• Do not vary the angle of valve except at mounting on
the rim. If varying the angle over and over, it may cause
breakage of antenna plate resulting in the failure of
TPMS transmitter.
• Use a soft tool to remove the grommet and washer to
prevent scratching the valve of the TPMS transmitter.
1. Hold the TPMS transmitter and the seal washer, then extract
it, this also extracts the seal. Take care to not damage the
valve thread.
Seal washer
Seal
AC609528AB
2. Clean the TPMS transmitter and the valve stem holding the
valve as shown. Take care to support the rear of the valve
with a thumb so that there is no movement of the stem.
AC609529
INSTALLATION SERVICE POINTS
.
>>A<< SEAL/SEAL WASHER/TPMS TRANSMITTER/NUT INSTALLATION
CAUTION
When installing a new seal and seal washer, make sure to
support the valve stem base with a thumb so that there is
no movement of the stem. Otherwise, the stem may protrude resulting in the breakage of antenna plate.
1. Insert these up to the base of the TPMS transmitter, making
sure to secure the valve base with a thumb, as shown.
Wipe the seal and threading.
Seal washer
Seal
AC609530AB
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42C-134
WIRELESS CONTROL MODULE (WCM)
TPMS TRANSMITTER
•
•
•
•
•
•
2.
CAUTION
Visually check that TPMS transmitter is not deformed
or damaged.
When installing the TPMS transmitter, be sure the rim,
seal valve and nut are clean.
Ensure the grommet is located inside the valve hole
before installing the nut.
While installing the nut, push the TPMS transmitter to
maintain the lower lip of the transmitter case is in contact with the rim without clearance.
While installing the valve nut, ensure the tool is kept
aligned to the valve and the valve hole.
After installing the nut, check that the seal is compressed and seal washer is bend.
Install the valve, in the valve hole, without modifying the
angle of the stem (retain position of delivery). The laser
marking should be visible at the operator.
AC609515
3. When the valve is completely inserted, maintain the TPMS
transmitter in contact with the rim, then screw manually the
nut until the contact with the wheel.
AC609516
4. While maintaining the TPMS transmitter contact with the rim
by applying pressure to the back of the valve, slightly press
on the cap to wards the center of the wheel in order to adapt
the angle of the valve/TPMS transmitter to the profile of the
rim.
It is mandatory to guarantee the contact of the housing unit
on the rim drop center.
AC609517AB
TSB Revision
WIRELESS CONTROL MODULE (WCM)
TPMS TRANSMITTER
42C-135
5. While maintaining the TPMS transmitter and valve in
position, screw the nut with a torque wrench.
Take care that the wrench socket is correctly inserted on the
nut.
Specified torque: 8.0 ± 0.5 N⋅ m (71 ± 4 in-lb)
AC609531AB
.
>>B<< TIRE BEAD MOUNTING
1. Prepare the tire and fix the rim as usual.
AC609532
2. Put the tire on the rim, so that the cross point of the belt with
the rim is approximately 20 cm (7.9 inch) away from the
valve.
AC609533 AB
3. Engage the shoe and make sure that 20 cm (7.9 inch) is
maintained between the cross point and the valve.
The arrow shows the direction of rotation of the wheel.
AC609534
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42C-136
WIRELESS CONTROL MODULE (WCM)
TPMS TRANSMITTER
4. Turn the wheel in order to engage all the first side of the tire.
NOTE: The standard shoes can pass over the sensor without damaging it.
AC609535
5. Put the second side of the tire in position, so that the cross
point of the belt with the rim is approximately 20 cm (7.9
inch) away from the valve. The curved arrow shows the
direction of rotation of the wheel.
AC609536 AB
6. Turn the wheel in order to engage all of the second side of
the tire.
NOTE: The standard shoes can pass over the sensor without damaging it.
AC609537
.
>>C<< TIRE PRESSURE INFLATION/NUT
RETIGHTENING
CAUTION
After tire inflation, retighten the valve nut to 8.0 ± 0.5 N⋅ m
(71 ± 4 in-lb). This is necessary, because the TPMS transmitter is secured to the wheel with the valve nut and rubber grommet. The rubber grommet will be depressed by
tire pressure or deteriorate over a period of time, which
requires the valve nut to be retightened.
Inflate tire to required pressure, then retorque the valve nut to
8.0 ± 0.5 N⋅ m (71 ± 4 in-lb).
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42C-137
WIRELESS CONTROL MODULE (WCM)
RECEIVER ANTENNA ASSEMBLY
RECEIVER ANTENNA ASSEMBLY
REMOVAL AND INSTALLATION
M1427510200014
11 ± 2 N·m
98 ± 17 in-lb
1
AC708899
AC709259AB
•
1.
Receiver antenna assembly
removal steps
Trunk room trim front (Refer to
GROUP 52A, Interior trim
P.52A-11)
Receiver antenna assembly
TSB Revision
NOTES
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