ui bulletin # 26

ui bulletin # 26
UI BULLETIN # 26
SUBJECT: Passlock Disablement for Vehicle
Remote Start Capability
MODELS AFFECTED: S/T,C/K, M/L & G Trucks
MODEL YEAR(S): 1998 and beyond
DATE: 04/22/99
PAGE: 1 of 9
THIS BULLETIN REPLACES SVIE BULLETIN #2 (ISSUED 11/10/97). This bulletin
provides a modified procedure which applies to all 1998 and 1999 model year trucks
with the Passlock system. Please note that the procedure provided in the original
version of this bulletin can still be used for the models called out in that bulletin.
PURPOSE
This bulletin provides a procedure to disable the Passlock System for vehicles in which
remote start/stop switch installations are required. This procedure is required because a
remote start system will not function with the current Theft Deterrent System (Passlock)
which is included on 1998 model year and beyond S/T, C/K, M/L, and G trucks. Please
note that this bulletin is intended to be used only in conjunction with the installation of a
remote start/stop system and does not provide a procedure to install a remote start/stop
system.
CAUSE
If an attempt is made to start a vehicle by a means other than a key rotation in the
ignition switch, the Body Control Module (BCM) will interpret this start as a vehicle theft
and disable the fuel injectors.
CORRECTION
A minor wiring modification may be made to allow the vehicle to be started remotely.
This modification includes adding a switch to allow the customer to select “ON” to allow
remote starting or “OFF” for normal Passlock operation.
CAUTION:
When this modification is performed and the switch is set to the ON
position, the theft deterrent feature will be disabled. When the theft
deterrent is disabled the SECURITY telltale will light up indicating that
the theft deterrent system is NOT functioning.
BB/BULLETIN
UI BULLETIN # 26 (Cont'd)
PASSLOCK MODIFICATION
Refer to appropriate GM service manuals and/or SVMQP Electrical Guideline Manual for
instruction on splicing and electrical connections.
1 . Select a suitable on-off switch (see note below) which will be used to disable/
enable the Passlock System. Mount the switch in a location such that it is
accessible to the driver and will not interfere with normal vehicle operation.
NOTE: This is an extremely low current circuit (approx. 7mA), it is therefore very
important that a high quality, low energy, fast acting switch be utilized
for this application.
2 . Turn the ignition switch to the OFF position.
3 . Locate the steering column harness to instrument panel harness in-line connector.
This connector is typically located by the steering column and, depending on
vehicle, may be below the instrument panel or behind the steering column shroud.
Refer to the illustrations in Figures 1 through 5 (pages 4 through 8) to locate the
in-line connector for each model covered in this bulletin.
4 . Locate the Yellow Passlock Data Wire (circuit #1836) which is in pin D3 of the
female steering column in-line harness connector as shown in Figure 6 (page 8).
Cut this wire and splice a 0.5mm2 (20 GA) yellow wire to each end of the cut wire.
Keep wire length to a minimum. Route modification wires clear of moving parts.
Connect the yellow wires to the switch such that the contacts are OPEN when the
switch is in the ON position.
5 . Turn modification switch to the OFF postion (contacts closed).
6 . Start vehicle to verify normal operation. If engine “cranks but will not start"
recheck the switch position (contacts should be closed), wire connectors and
modification wiring.
ML/Bulletin 26
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UI BULLETIN # 26 (Cont'd)
SWITCH OPERATION
To enable remote start:
Start the engine with the ignition key (modification switch must be in the OFF
position). Turn modification switch to the ON position (contacts open). The
Security Telltale will light up indicating that the Passlock System is inoperative.
Once the security telltale has been on for at least 5 seconds the vehicle can be
turned off and then remotely started.
To disable remote start:
The Passlock System can be reactivated by turning the modification switch OFF
(contacts closed). Vehicle can either be running or off when this is done.
NOTICE
Any condition which removes battery power from the Vehicle Control Module/Powertrain
Control Module (VCM/PCM) (e.g. dead battery, disconnected harness connectors, etc.) will
prevent the vehicle from being restarted. If the engine exhibits a “cranks but will not
start” symptom, check to make sure that the modification switch is in the OFF (contacts
closed) position.
Please note that the VCM/PCM will record Diagnostic Trouble Codes (DTCs) related to the
security system when the modification switch is in the ON position (circuit open). This is
due to the way that the VCM/PCM interprets this condition.
ML/Bulletin 26
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ML/Bulletin 26
Figure 1
INSTRUMENT PANEL
(I/P) HARNESS
4 of 9
STEERING
COLUMN
HARNESS
STEERING COLUMN
IN-LINE CONNECTOR
(FEMALE)
S/T
4/22/99
UI BULLETIN # 26 (Cont'd)
STEERING COLUMN
IN-LINE CONNECTOR
(MALE)
UI BULLETIN # 26 (Cont'd)
FIGURE 2
INSTRUMENT
PANEL (I/P)
HARNESS
STEERING COMUMN
IN-LINE CONNECTOR
(MALE)
STEERING COLUMN
IN-LINE CONNECTOR
(FEMALE)
STEERING
COLUMN
HARNESS
ALL NEW C/K
ML/Bulletin 26
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UI BULLETIN # 26 (Cont'd)
FIGURE 3
STEERING COLUMN
IN-LINE CONNECTOR
(FEMALE)
STEERING COLUMN
IN-LINE CONNECTOR
(MALE)
INSTRUMENT
PANEL (I/P)
HARNESS
T
FR
CURRENT C/K
ML/Bulletin 26
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UI BULLETIN # 26 (Cont'd)
FIGURE 4
INSTRUMENT
PANEL (I/P)
HARNESS
STEERING
COLUMN
HARNESS
VIEW A
STEERING
COLUMN
IN-LINE
CONNECTOR
(MALE)
STEERING COLUMN
IN-LINE CONNECTOR
(FEMALE)
M/L VAN
ML/Bulletin 26
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UI BULLETIN # 26 (Cont'd)
FIGURE 5
FR
T
STEERING
COLUMN
HARNESS
STEERING COLUMN
IN-LINE
CONNECTOR
(MALE)
STEERING COLUMN
IN-LINE CONNECTOR
(FEMALE)
G-VAN
ML/Bulletin 26
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UI BULLETIN # 26 (Cont'd)
FIGURE 6
STEERING COLUMN
IN-LINE CONNECTOR
(FEMALE)
LOCATION D3
STEERING COLUMN
IN-LINE CONNECTOR
(MALE)
PART #12077822
PASSLOCK DATA WIRE
LOCATION (D3)
YELLOW (CIRCUIT 1836)
CONNECTOR
RETAINER
BOLT
TERMINAL (LOCATION D3)
PART
PART
PART
PART
#12047837
#12004737
#12047743
#12066214
STEERING COLUMN IN-LINE CONNECTOR END VIEW
ML/Bulletin 26
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4/22/99
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