Audi | 2003 A8 | Self-Study Programme 287 Audi A8 ´03 Electrical

287
Service.
AUDI A8 '03 - Electrical Components
Self Study Programme 287
For internal use only
Wiring
Prerequisite
Follow-up function
Wireless transmission
– reception signal
Wireless transmission
– transmission signal
Discrete wire
Transmission wire
Reception wire
Bidirectional wire
Diagnosis CAN
LIN bus
MOST bus
Dash panel insert CAN
Adaptive cruise control CAN
Drive system CAN
Convenience CAN
An understanding of the interaction of the
components and distributed functions forms
the necessary basis for successful
fault-finding.
This Self Study Programme contains
information on data bus networking
(topology) and electrical components in the
Audi A8 ´03.
1
Components marked in
yellow indicate the substitute
master.
Components marked in red
indicate the function master
within a sequence of
operations.
The layout of the individual
components such as control
units, switches or control
elements as illustrated
corresponds to the actual
arrangement in the vehicle.
Component designations are
explained on the basis of their
identifiers in the relevant text.
The blue arrow indicates
output information.
The green arrow indicates
input information.
A number is used to
designate the information
sequence described in the
corresponding text.
The green circle symbolises
the start of an information
sequence.
Components and symbols
– SSP 282 – Audi A8 ´03 Technical Features
– SSP 286 – New Data Bus Systems –
LIN, MOST, BluetoothTM
– SSP 288 – Audi A8 ´03 Distributed Functions
– SSP 289 – Adaptive cruise control in the
Audi A8 ´03
– SSP 293 – Audi A8 ´03 Infotainment
More detailed information can be found in the
following Self Study Programmes:
This introduction contains explanatory notes to
clarify the meanings of certain terms, designations
and symbols used in this Self Study Programme.
J518
J527
J519
1 The intermittent wiper switch E22
transmits the information "Wiper speed 1"
to the steering column electronics
control unit J527.
Ignition switched on by way of electric
ignition/starter switch or Advanced Key, so
that entry and start authorisation control unit
J518 transmits terminal 15 and 75x
information to convenience CAN.
Prerequisite
Example: Wiper speed 1 function
This term indicates that several control units
are required to exchange information in order
to implement a function.
Distributed functions
It thus becomes clear which bus systems are
used by the control units to exchange data.
The topology provides a general outline of the
way in which control units fitted in the vehicle
are interlinked by way of data bus systems.
Data bus network (topology)
Definition of terms
3 The onboard power supply control unit
transmits the information "Wiper speed 1"
via the LIN to the wiper motor control unit
J400.
The wiper motor control unit actuates
the integrated motor.
2 The steering column electronics transmits
the information "Wiper speed 1" to the
onboard power supply control unit J519.
SSP287_005
Ignition ON
E22
J400
In the event of function master failure
affecting major functions, the task of the
function master is assumed by a control unit
provided for this purpose and designed to
maintain the sequence of operations
(possibly with certain restrictions).
Substitute master
With distributed functions, one control unit is
always responsible for the entire sequence of
operations. The function master control unit
gathers all input information. The requests
resulting from this are then transmitted in the
form of a message on the data bus system
and read into the control units concerned for
corresponding actuation of the appropriate
connected components.
Function master
Contents
Page
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Control Units
Drive system CAN/convenience CAN connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Data bus diagnostic interface J533 (gateway) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Energy management control unit J644 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Control unit with display in dash panel insert J285 . . . . . . . . . . . . . . . . . . . . . . . . 38
Convenience system central control unit J393 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Boot lid control unit J605 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Anti-theft/tilt system control unit J529 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Onboard power supply control unit J519 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Wiper motor control unit J400 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Onboard power supply control unit 2 J520 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Door control units J386 to J389 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Sunroof electronics control unit J528 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Garage door operation control unit J530. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Entry and start authorisation control unit J518 . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
Driver identification control unit J589 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
The Self Study Programme contains information on design
features and functions.
New
Attention
Note
The Self Study Programme is not intended as a Workshop
Manual.
Values given are only intended to help explain the subject
matter and relate to the software version applicable at the time
of SSP compilation.
Use should always be made of the latest technical publications
when performing maintenance and repair work.
3
Introduction
Bus topology
Distance regulation
control unit J428
Control unit with
display in dash panel
insert J285
Diagnostic connection T16
Diagnosis CAN
(500 kbit/s)
Electric park and
handbrake
control unit J540
Headlight range
control unit
J431
Engine
electronics 1
J623
Airbag control unit
J234
Engine
electronics 2
J624
ABS with EDL
control unit
J104
Adaptive
suspension control
unit J197
Automatic gearbox
control unit
J217
Drive system CAN
(500 kbit/s)
Dash panel insert CAN
(500 kbit/s)
Internal bus link
Anti-theft/
tilt system control
unit J529
LIN
(20 kbit/s)
Door control unit,
driver side J386
4
Boot lid
control unit
J605
Wiper motor
control unit
J400
Garage door
operation control
unit J530
Multifunction
steering wheel
E221
Convenenience
system central
control unit J393
Onboard power
supply control unit
J519
Onboard power
supply control
unit 2 J520
Steering column
electronics control
unit J527
Door control unit,
front passenger
side J387
Door control unit,
rear left J388
Door control unit,
rear right J389
Seat adjustment
control unit
J136
Steering angle
sender G85
Seat adjustment
control unit,
front passenger
J521
BluetoothTM
Adaptive cruise control
CAN
(500 kbit/s)
Rear DVD changer
R162
Telephone/
telematics control
unit J526
Control unit for rear
right
information display
and operating unit
J649
Telephone
handset
R37
Control unit for rear
left
information display
and operating unit
J648
Front information
display and
operating unit
control unit J523
DSP control unit
J525
Data bus diagnostic
interface J533
Navigation control
unit
J401
MOST bus (21 Mbit/s)
TV tuner
R78
Convenience CAN
(100 kbit/s)
CD ROM drive
R92
CD changer
R41
Digital radio
R147
Chip card reader
control unit
J676
Fresh-air blower
control unit
J126
Heated windscreen
control unit J505
Rear left footwell
heater element Z42
Radio module R
Rear right footwell
heater element Z43
Driver seat
ventilation
control unit J672
Front passenger
seat ventilation
control unit J673
LIN
Climatronic control
unit J255
Rear seat adjustment
with memory
control unit J522
Trailer detector
control unit J345
Energy
management
control unit J644
Entry and start
authorisation
control unit J518
Rear Climatronic
control and
display unit E265
Tyre pressure
monitor control unit
J502
Sunroof electronics
control unit
J528
Additional heater
control unit
J364
Driver
identification
control unit J589
Front passenger side
rear seat ventilation
control unit J675
Sliding sunroof
motor V1
Auxiliary heating
radio controlled
receiver R64
Parking aid control
unit J446
LIN
Driver side rear seat
ventilation
control unit J674
SSP287_057
5
Control Units
Drive system CAN/
convenience CAN
connectors
Connector
Convenience CAN
contact links
CAN wiring
Link
SSP287_014
Catch
Drive system CAN
contact links
Two CAN bus connectors are used in the
Audi A8 ´03.
The connectors form the central junction for
both the convenience and the drive system
CAN.
6
All CAN wires of the respective bus system
control units are attached to the connectors.
Fitting locations
The connectors are installed on the right and
left sides of the dash panel behind the end
trim. The catch has to be unfastened before a
link can be detached.
The pin assignments of the two connectors
are different in left and right-hand drive
vehicles.
The pin assignments can be found in the
appropriate Workshop Manual or under
"Vehicle information" in assisted faultfinding.
SSP287_015
SSP287_016
7
Control Units
Star connection
All drive system and convenience CAN control
units are linked to the corresponding
connector in star configuration.
Some of the control units of a bus system are
linked to the right connector, whereas the
others are linked to the left connector.
In turn, the left and right connectors are
interlinked by a CAN wire so that ultimately
all convenience CAN control units are
interlinked, as are those of the drive system
CAN.
Convenience CAN
wire
Drive system CAN
wire
Front passenger side
CAN connector
Driver side CAN
connector
SSP287_017
CAN wires to control
units
CAN wires to control
units
Test box
Use is made for the CAN connectors of the
test box 1598/38.
This test box makes it possible to access the
individual drive system and convenience CAN
control unit wires with the digital storage
oscilloscope of VAS 5051. Individual control
units can also be disconnected from the bus
system during fault-finding.
8
This is necessary, for example, when trying to
localise CAN bus short circuits. The link
connecting the CAN wires of the individual
control units is inserted at the test box and
can also be checked.
Block diagram
T46a
J527 J386 J388 J446 J345 J502 J136 J518 J524 J519
J527 J104
J234 J431
J533 J387 J389 J520 J393 J644 J364 J528 J521 J522 J589 J255
J533 J540 J217 J623 J197
T46b
SSP287_018
Key
J104 ABS with EDL control unit
J136 Seat adjustment with memory
control unit
J197 Adaptive suspension control unit
J217 Automatic gearbox control unit
J234 Airbag control unit
J255 Climatronic control unit
J345 Trailer detector control unit
J364 Additional heater control unit
J386 Door control unit, driver side
J387 Door control unit, front passenger side
J388 Door control unit, rear left
J389 Door control unit, rear right
J393 Convenience system central control unit
J431 Headlight range control unit
J446 Parking aid control unit
J502 Tyre pressure monitor control unit
J518 Entry and start authorisation control unit
J519 Onboard power supply control unit
J520 Onboard power supply control unit 2
J521 Seat adjustment with memory control
unit, front passenger
J522 Seat adjustment with memory control
unit, rear
J524 Rear information display and
operating unit control unit
J527 Steering column electronics
control unit
J528 Sunroof electronics control unit
J533 Data bus diagnostic interface
J540 Electric park and handbrake
control unit
J589 Driver identification control unit
J623 Engine control unit
J644 Energy management control unit
T46a 46-pin, black connector at left CAN
breaker
T46b 46-pin, black connector at right CAN
breaker
Colour code
= Convenience CAN High
= Convenience CAN Low
= Drive system CAN High
= Drive system CAN Low
9
Control Units
Data bus diagnostic
interface J533 (gateway)
The wide range of interlinked vehicle
functions necessitates the use of several data
bus systems on account of the capacity
required for handling the great volume of data
to be transmitted.
Diagnosis CAN
500 kbit/s
Drive system CAN
500 kbit/s
The data bus diagnostic interface is a network
gateway for data bus systems, the principal
function of which is to form the interface
between the various independent data bus
systems in the vehicle.
In the past, the gateway function was
integrated into the dash panel insert. A
separate control unit is employed in the
Audi A8 ´03 to cope with the large number of
functions distributed over various control
units and requiring a high level of data
transfer between the control units of the
different bus systems.
Dash panel insert
CAN 500 kbit/s
MOST
21 Mbit/s
Adaptive cruise
control CAN
500 kbit/s
(optional)
Convenience
CAN
100 kbit/s
SSP287_001
Versions
Two different data bus diagnostic interface
J533 versions are used in the Audi A8 ´03: One
with connection to the optional adaptive
cruise control (ACC) system and the other
without this connection.
Optical
output
Optical
input
Both versions however feature a connection
for the MOST optical data bus fitted as
standard.
SSP287_002
Electrical connection
10
Fitting location
In the Audi A8 ´03, the data bus diagnostic
interface is installed at the module holder
behind the glove box.
SSP287_004
Block diagram
J533 Data bus diagnostic interface
Diagnosis
CAN
30
15
Ring fault Dash panel
diagnosis insert
wake-up wire
31
J533
SSP287_003
Drive system Convenience
CAN
CAN
Dash panel
insert CAN
Adaptive cruise
control CAN
(optional)
MOST bus
11
Control Units
Data exchange
Example: Transmission from terminal 15
E408
Control units
connected to
MOST bus
J518
J285
J533
E415
Control units
connected to
convenience CAN
Control units
connected to drive system CAN
The data bus diagnostic interface J533
implements the exchange of data between
the various data bus systems.
To do so, it transmits data with a short
propagation time from one data bus system to
the other.
In this process, not all data from one bus
system are transmitted to the next, but rather
only the data required by the system
concerned.
1a The terminal 15 information is
transmitted by the entry and start
authorisation button E408 via a discrete
wire to the entry and start authorisation
control unit J518.
2
The entry and start authorisation control
unit relays the information via the
convenience CAN to the data bus
diagnostic interface.
3
The information is read in by the data bus
diagnostic interface J533 and transmitted
to the drive system CAN, dash panel insert
CAN (control unit with display in dash panel
insert J285) and MOST bus.
The information is thus available to all
connected control units.
or
1b Transmission from terminal 15 to the
entry and start authorisation control unit
J518 is effected via a discrete wire by
actuating the entry and start
authorisation switch E415.
12
SSP287_006
Master functions
The data bus diagnostic interface is the
master for:
– Drive system CAN continued operation
– MOST ring fault diagnosis
– Data bus system sleep and wake-up
Drive system CAN continued operation
Sleep and wake-up mode
Terminal 15 continued operation for various
control units connected to the drive system
CAN (refer to entry and start authorisation
control unit) is sustained until the data bus
diagnostic interface transmits a command for
termination of continued operation to the
drive system CAN.
The data bus diagnostic interface is the
master for sleep and wake-up modes in the
vehicle. When all control units connected to
the convenience CAN indicate "sleep
readiness", the gateway transmits the sleep
command to the CAN bus and the connected
control units switch to sleep status. The sleep
status of the individual control units and bus
systems can be read out in the Audi A8 '03
from the measured value blocks of the data
bus diagnostic interface.
MOST ring fault diagnosis
The data bus diagnostic interface is the
diagnosis manager for the MOST bus. This is
responsible for ring fault diagnosis and
transmits the diagnosis data of the control
units in the MOST bus to the data bus
diagnostic interface.
Ring fault diagnosis for the MOST bus is
initiated by way of the final control diagnosis
in the data bus diagnostic interface (refer to
SSP 286 - New Data Bus Systems, Page 41
onwards).
Diagnostic wire
Data bus diagnostic
interface
Diagnostic
connection
SSP287_007
Break in
optical fibre
13
Control Units
Diagnosis
The data bus diagnostic interface enables
data to be exchanged between the diagnosis
unit and the individual control units in the
vehicle. In this process, the control unit
diagnosis data are transmitted via the
corresponding data bus system to the
diagnostic interface and from there via the
diagnostic connector to the diagnosis unit
(refer to SSP 286 under "Diagnosis CAN",
Page 50).
The data bus diagnostic interface retains
diagnostic capability even without terminal 15
ON. This is however subject to the restriction
that no write operations, such as encoding, can
be implemented.
The ignition must be on for starting diagnosis,
as the 500 kbit/s diagnosis CAN has no wakeup capability.
Measured value blocks
The data bus diagnostic interface is provided
with measured value blocks in which
communication, one-wire diagnosis and
sleep mode are displayed.
If there is communication with a control unit
fitted in the vehicle, this is indicated in the
measured value block by a 1. If there is no
communication with a control unit fitted in
the vehicle or encoded, this is indicated by
a 0.
Assisted fault-finding
Functional test
J533 - Display measured value
blocks
If a control unit is in one wire mode, this is
indicated by "1 wire". In the Audi A8 ´03, the
measured value block for one-wire diagnosis
is only available in the diagnostic interface.
The "sleep readiness" of the control units is
indicated by "S". If the vehicle is in diagnosis
mode, the bus systems do not switch to sleep
mode even if all control units are indicating
"sleep readiness".
Audi
V05.02 18/06/2002
Audi A8 2003>
2003 (3)
Saloon
BFM 4.2l Motronic / 246 kW
Measured value block 130
1.Functional
description
Two-wire
Convenience data bus
Electr. CE 1
Electronic central electrics
Central 0
Convenience system central module
Driver's door 1 wire
Driver's door electronics
Measurement
Jump
Print
Help
SSP287_010
14
Control element test
The following control element tests are
available in the data bus diagnostic interface
as part of assisted fault-finding:
– Start of ring fault diagnosis (refer to
SSP 286, Page 41)
– Start of ring fault diagnosis with dB
reduction (refer to SSP 286, Page 43)
– Transmission of sleep command
On transmitting the sleep command by way
of the final control diagnosis (terminal 15
must be off), the drive system CAN and
convenience CAN are switched to sleep mode
by the data bus diagnostic interface.
Switching of the convenience CAN to sleep
mode is however only possible if no other
control unit is keeping the bus awake, for
example on account of a fault.
Gateway fitting list
On entering diagnosis mode, a detailed list
containing the control units fitted in the
vehicle and their current status is read out
from the data bus diagnostic interface. The
gateway fitting list can be displayed in the
self-diagnosis main menu or via assisted
fault-finding. The fitting list (also referred to
as configuration table) shows whether all
control units have been properly encoded, as
well as their fault status.
Vehicle self-diagnosis
Gateway fitting list
Audi
V05.02 18/06/2002
Audi A8 2003>
2003 (3)
Saloon
Communication link
BFM 4.2l Motronic / 246 kW
01 - Engine electronics
OK
61 - Battery control
Fault
02 - Gearbox electronics
OK
42 - Driver's door electronics
Fault
52 - Front passenger's door electronics
OK
62 - Rear left door electronics
Fault
72 - Rear right door electronics
Fault
03 - Brake electronics
Fault
53 - Parking brake
Fault
34 - Adaptive suspension
OK
05 - Entry and start authorisation
OK
15 - Airbag
Fault
55 - Headlight range control
Fault
Measurement
Jump
Print
Help
SSP287_012
If, for example, a control unit has been fitted
but not encoded, this is indicated in the
fitting list as "Not registered". If a control unit
has been encoded, but there is no
communication with it, this may be due to a
fault or non-installation. This control unit is
then labelled "Not obtainable".
VAS display
Significance
OK
Communication OK
Not
obtainable
The control unit is registered
(encoded) in the gateway but
there is no communication
with it
Fault
A fault entry has been stored
in the control unit
Not
registered
The control unit is not
registered in the gateway
(not encoded), but it has
been fitted/there is
communication with this
control unit
15
Control Units
Encoding
The encoding informs the data bus diagnostic
interface of which control units are fitted in
the vehicle.
In addition to the familiar encoding, the
function "Read/write long encoding" is
provided in the diagnostic interface. After
selecting this function, a list containing the
address words of all possible control units in
the vehicle is called up in the diagnosis tester
in the usual sequence.
Vehicle self-diagnosis
Read/write long encoding
Control units can then be selected/rejected.
Pressing the "Continue" key transfers the
encoding to the control unit.
After encoding the diagnostic interface with
"long encoding", a fitting list should be read
out to check whether all control units in the
vehicle have been correctly encoded in the
gateway.
19 - Data bus diagnostic interface
4E0910468
4E0907468- *
Gateway
H04 X200
Long encoding
Dealership number 6794
01 - Engine electronics
61 - Battery control
02 - Gearbox electronics
42 - Driver's door electronics
52 - Front passenger's door electronics
62 - Rear left door electronics
72 - Rear right door electronics
03 - Brake electronics
53 - Parking brake
34 - Adaptive suspension
05 - Entry and start authorisation
15 - Airbag
55 - Headlight range control
65 - Tyre pressure monitoring
Measurement
Jump
Encoded
Encoded
Encoded
Encoded
Encoded
Encoded
Encoded
Encoded
Encoded
Not encoded
Encoded
Encoded
Encoded
Encoded
Print
Help
SSP287_013
16
Energy management
control unit J644
Use is made for the first time in the
Audi A8 ´03 of a battery and energy
management control unit.
The increase in the number of electronic
components and controls in the vehicle gives
rise to a far greater power requirement. The
uncontrolled tapping of power can cause a
major drop in the level of electrical energy
available in all vehicle statuses.
The principal tasks of the energy
management control unit are to monitor the
battery charge, to regulate loads via the CAN
in extreme circumstances, to minimise
current consumption by deactivating
functions and to ensure optimum charging
voltage. The aim is to avoid excessive battery
discharge and thus ensure that the vehicle
can always be started.
SSP287_039
Fitting location
The energy management control unit J644 is
installed on the right of the luggage
compartment in the immediate vicinity of the
battery.
Functions
The energy management control unit J644 is
responsible for constant monitoring of the
battery, which includes checking the state of
charge (SOC) and starting capability. The
control unit regulates the optimum alternator
charging voltage with the engine running. It
can implement load shedding (reduce the
number of loads) and increase idling speed.
To reduce the closed-circuit current with the
engine OFF, the energy management control
unit can deactivate loads via the CAN in
extreme circumstances and thus prevent
excessive battery discharge.
SSP287_025
17
Control Units
Block diagram
30
15
1
2
+
A
J655
J644
3
5
4
G
C
31
M
B
SSP287_041
Additional signals
Key
A
Battery
1 Airbag control unit J234
B
Starter
2 Airbag control unit J234
C
Alternator
3 Convenience CAN High
J644
J655
Energy management control unit
Battery cut-off relay
4 Convenience CAN Low
5 Terminal 50 (from starter relay 2
J695)
18
System outline
CAN inputs
–
–
–
–
–
–
–
–
–
–
–
–
Inputs via BSI*
– DF signal (alternator capacity
utilisation)
– Alternator mechanical fault
– Alternator electrical fault
– Alternator high-temperature
regulation
* BSI = Bit-synchronous interface
Convenience CAN Low
Ambient temperature
Engine speed
Coolant temperature
Standing time
Ignition/starter switch
Heated windscreen
Heated rear window
Specified idling speed feedback
Load shedding request
Heating system load shedding
Alternator activation
Convenience CAN High
–
–
–
–
–
–
–
–
–
–
–
CAN outputs
–
–
–
–
–
–
–
–
Drive system deactivation stage
Idling speed increase
Deactivation stages
Load shedding
Alternator load torque
Alternator power input
Battery manager/battery voltage
Heating system deactivation
Charge
Starting capability
Deactivation stage 6
Terminal DFM – BEM (battery
energy manager)
Load shedding feedback
Alternator load response
Alternator fault
Infotainment deactivation
Battery manager service fault
Heavy-duty heating system status
Heavy-duty heating system control
status
Emergency load deactivation active
Outputs via BSI*
– Specified alternator voltage
– Start load response
– Drive load response
19
Control Units
Function modules
The tasks of the energy management control
unit J644 are distributed over three function
modules, which are active in different vehicle
statuses.
Energy management control unit
Function module 1
Battery manager
Battery diagnosis
Function module 1 is the battery manager.
This is responsible for battery diagnosis
(always active).
Function module 2 is the closed-circuit
manager. It deactivates "standing" loads as
required (engine not running).
Function module 3 is responsible for dynamic
management, in other words for charging
voltage regulation and load reduction (engine
running).
Function module 2
Closed-circuit manager
"Standing" load deactivation
Function module 3
Dynamic management
Charging voltage regulation
Load reduction
Function module action
The three function modules are active in
specific vehicle statuses. A distinction is
made between three vehicle statuses:
Vehicle status
20
Battery manager
Closed circuit
manager
Terminal 15 OFF
Active
Active
Terminal 15 ON,
engine not running
Active
Active
Terminal 15 ON,
engine running
Active
Dynamic
management
Active
Battery manager
For implementation of battery diagnosis, the
battery manager in the energy management
control unit has to establish the following
data:
–
–
–
–
Battery temperature
Battery voltage
Battery current
Operating times
Battery temperature
-35 - 70 °C
For display:
– State of charge
(SOC)
– Starting capability
forecast
Battery voltage
5.5 - 16 V
For current
consumption control:
– Deactivation stages
Battery current
10 mA - 100 A
For alternator:
– Optimum
charging voltage
Operating times
Alternator emergency
reserve:
– Regulation of
heavy-duty and
heating systems
Energy management
control unit J644
The battery current and battery temperature
are measured in the control unit and the
battery temperature converted to the battery
by means of an algorithm. The battery voltage
on the other hand is measured at the battery
positive terminal.
21
Control Units
Battery status display
The starting capability and current charge are
displayed in the dash panel insert. These two
quantities form the basis for closed-circuit
and dynamic management. The alternator is
provided with the optimum charging voltage
via an interface.
Battery
weak
PR N D S
MMI displays
The battery charge can be called up via the
CAR function in the MMI.
The display takes the form of a bar with 10 %
increments. A charge of between
60 and 80 % is normal.
Car
User
Charge
Systems
Running electrical loads over a lengthy period
with the engine switched off discharges
the battery. If the starting capability of the
engine is jeopardised by this, the MMI
displays a request to start the engine to
prevent automatic system deactivation in the
next three minutes.
Logbook
TP TMC
Maintenance
SSP287_042
Car
Starting capability
Please start engine, as
otherwise system will
be deactivated in 3 minutes.
Charge warning lamp (alternator lamp)
The charge warning lamp is located in the rev
counter in the dash panel insert.
In contrast to previous Audi vehicles, the lamp
is however actuated by the energy
management control unit.
TP
SSP287_121
SSP287_102
22
Closed-circuit manager
The function of the closed-circuit manager in
the energy management control unit J644 is to
request control units to deactivate loads as
required.
It is active with terminal 15 OFF and terminal
15 ON/engine OFF.
If the vehicle is stationary, the closed-circuit
current must be reduced to such an
extent that the battery is only slightly
discharged and starting is possible even after
a long standing time. If the battery charge is
not sufficient to be able to supply all
"standing" loads, convenience and
infotainment load functions are deactivated.
The loads to be deactivated by a control unit
are specified in deactivation stages on a
hierarchical basis (refer to Page 28).
Control unit loads are deactivated in six
stages.
The lower the battery charge, the higher the
deactivation stage. The necessary
deactivation stage is provided by the energy
management control unit via the data bus
systems. The dash panel insert informs the
driver of restrictions to functions.
As regards diagnosis, it should be
remembered that an activated deactivation
stage may be the cause of a restricted
function. Activation of a deactivation stage is
stored as a fault in the fault memory of the
energy management control unit.
The loads/functions deactivated by a control
unit are indicated under "Vehicle information"
in the assisted fault-finding routine.
Assisted fault-finding
Function/component selection
Audi
V05.02 18/06/2002
Audi A8 2003>
2003 (3)
Saloon
BFM 4.2l Motronic / 246 kW
Vehicle information
Dynamic and closed-circuit management
General
Closed-circuit deactivation stage 1
Closed-circuit deactivation stage 2
Closed-circuit deactivation stage 3
Closed-circuit deactivation stage 4
Closed-circuit deactivation stage 5
Closed-circuit deactivation stage 6
Measurement
Vehicle
self-diagnosis
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SSP287_061
23
Control Units
Deactivation stages
The individual deactivation stages are
initiated by the energy management control
unit in line with the charge of the vehicle
battery.
The deactivation stages result in the
following:
– Deactivation stage 4 – Transportation
mode
– Deactivation stage 1
Convenience CAN loads are deactivated.
This deactivation stage is activated by way
of the diagnosis unit and cannot be
initiated independently by the energy
management control unit.
– Deactivation stage 2
Initiation of this stage results in
deactivation of additional convenience
CAN loads. Certain infotainment system
restrictions are implemented.
– Deactivation stage 5
The auxiliary heater is deactivated.
– Deactivation stage 3
– Deactivation stage 6
Reduction of the closed-circuit current is
initiated.
Bus system wake-up action is reduced.
Deactivation stages 1 - 3
In stages 1 - 3, loads are deactivated by the
control units in the vehicle to prevent further
battery discharge.
Examples of deactivation stages for onboard
power supply control unit 2:
Load
24
Stage 1
Stage 2
Stage 3
MMI opening/closing
Active
Inactive
Inactive
Headlight washing
Inactive
Inactive
Inactive
Washer fluid heating
Inactive
Inactive
Inactive
Deactivation stage 4
The fourth stage is the transportation mode,
which can be initiated via the diagnosis unit.
The transportation mode is designed to
greatly reduce battery discharge in the event
of lengthy vehicle standing times or longdistance transportation.
Data bus diagnostic
interface J533
An adaption channel for activation is provided
for this purpose in the energy management
control unit J644. In channel 1 "Transportation
mode", it is possible to select either
0 = Normal mode or 1 = Transportation mode.
Virtually all convenience functions are
deactivated in transportation mode to ensure
maximum standing time without battery
discharge. This is necessary for example
during transportation overseas.
Transportation mode
adaption with diagnosis unit
J644
Deactivation stage 5
The auxiliary heater is deactivated in this
stage.
Transportation
mode deactivation
stage 4
Deactivation stage 6
In stage 6, the bus system control units are
only wakened with terminal 15 ON and on
entering the vehicle. All other sources of bus
system wake-up are suppressed.
SSP287_040
As starting capability is only just retained in
deactivation stage 6, it must not be possible
for every source to trigger control unit wakeup in order to save power. This also applies to
infotainment components and means that it is
not possible to use the telephone in stage 6.
The reserve battery ensures that emergency
and breakdown calls can still be made.
25
Control Units
Operating principle
Fault memory entry
"Deactivation stage 2"
J644
Deactivation stage 2
(receiver inactive)
Deactivation
stage 2
Other control units
connected
to convenience CAN
J502
"Deactivation stage 2"
is transmitted
Deactivation stage 2
J285
J533
Deactivation stage 2
(radio controlled
clock synchronisation
inactive)
Control units connected
to MOST bus
J525
Deactivation stage 2
(amplifier inactive)
Deactivation stage 2
SSP287_043
26
The energy management control unit J644
transmits the necessary deactivation stage to
the data bus as required.
After reading in the information, the control
units connected to the bus systems
deactivate the loads specified for each
deactivation stage. For this purpose, the
loads to be deactivated in the corresponding
deactivation stage are stored in each control
unit.
In the example the energy management
control unit transmits deactivation stage 2 to
the convenience CAN. The convenience CAN
control units then deactivate the loads/
functions stipulated for deactivation stage 2.
These are specified in the software of the
corresponding control unit.
For example, the tyre pressure monitor
control unit J502 deactivates the aerial
receiver to save power. The data bus
diagnostic interface J533 distributes the
information "Deactivation stage 2" to the
other bus systems. In turn, the control units
connected to the other bus systems then all
react by deactivating the loads stipulated for
deactivation stage 2.
The control unit with display in dash panel
insert J285, which is connected to the dash
panel insert CAN, deactivates the radio
controlled clock receiver to save power or the
digital sound package control unit J525
connected to the MOST bus deactivates the
audio amplifier.
27
Control Units
Gradual closed-circuit current reduction
The closed-circuit current reduction stages
extend the possible vehicle standing time, as
the closed-circuit current decreases with each
deactivation stage. There is however no
calculation function for standing time
extension.
If the driver gets into the vehicle, all functions
are quickly re-established.
Deactivation stage 4 is however a special
case. It cannot be initiated by the vehicle
alone, use must be made of the diagnosis
unit.
Deactivation stage 2 is activated immediately
if a closed-circuit current > 50 mA is
determined after a standing time of three
hours.
Switching on the engine resets all previously
active deactivation stages. Connection of a
battery charger to a battery connected in the
vehicle also deactivates all deactivation
stages (refer to Battery charging on Page 36).
This does not however apply to deactivation
stage 4 – Transportation mode.
The priority setting for the deactivation
stages is thus 1-2-5-3-6. The designations for
the individual stages were established during
system development.
State of charge (SOC)
(%)
Normal
operation
Stage 1
Stage 2
Stage 5
Stage 3
Stage 6
Closed-circuit
current
Starting capability limit
IR (A)
Starting capability limit
Time
Possible standing time
without energy
management
28
Standing time extension by way of
power consumption reduction
SSP287_044
Systems involved
The following systems are involved in load
deactivation by way of the closed-circuit
manager module in the energy management
control unit:
– MOST bus
Front information display and operating
unit control unit J523
CD ROM drive R92
CD changer R41
TV tuner R78
Digital radio R147
Radio module R
Navigation system control unit J401
Digital sound package control unit J525
Telephone/telematics control unit J526
Aerials
Chip card reader control unit J676
The loads/functions deactivated are indicated
in the assisted fault-finding routine under
"Vehicle information" as part of the "Function
and component selection" section.
– Convenience CAN
Sunroof electronics control unit J528
Seat adjustment with memory control unit
J136
Seat adjustment with memory control unit,
front passenger J521
Seat adjustment with memory control unit,
rear J522
Climatronic control unit J255
Additional heater control unit J364
Convenience system central control unit
J393
Onboard power supply control unit J519
Onboard power supply control unit 2 J520
Door control unit J386
Door control unit J387
Door control unit J388
Door control unit J389
Entry and start authorisation control unit
J518
Tyre pressure monitor control unit J502
Control unit with display in
dash panel insert J285
Driver identification control unit J589
Alternator
Use is made in the Audi A8 ´03 of a watercooled 190 A alternator from Hitachi.
The rated currents of the alternator
incorporated into the engine cooling circuit
are as follows:
– At alternator speed n = 1800 rpm
(corresponding to engine idling) In = 130 A
– At alternator speed n = 6000 rpm
In = 190 A
Further information on the water-cooled
alternator can be found in SSP 268 –
"The 6.0 l W12 engine in the Audi A8 - Part 2".
SSP287_122
29
Control Units
Dynamic management
The function of the dynamic management
system is to distribute the power generated to
the individual systems as required and to
provide the battery with sufficient charging
current.
To ensure a stable power supply, the power
available in the electrical system is
distributed as required.
Three control stages are available for this
purpose.
It is active when the engine is running.
Main tasks:
–
–
–
–
–
–
The dynamic energy manager monitors
electrical system capacity utilisation by
measuring electrical system voltage, battery
current and alternator capacity utilisation.
Battery voltage regulation
Load shedding
Regulation of heavy-duty heating systems
Idling speed increase
Alternator activation
Alternator control dynamics
Control stages
Heating system control conditions
1
Continuous
power regulation
Electrical system overload due to utilisation of full
alternator capacity accompanied by drop in battery
charging voltage to below specified values
2a
Partial
emergency shutdown
Only in the event of a fault (or briefly, < 10 s, with no
fault memory entry):
– Permanent power overload (> 10 s), electrical system
cannot be stabilised by way of simple regulation as
part of continuous heating system control, battery
charged (starting jeopardised)
– Alternator fault (fault memory entry 02252)
– Alternator high-temperature regulation
(fault memory entry 02253)
– Load shedding by engine control unit (e.g. high
alternator load is reduced on speed dip); only
possible for 10 s -> no fault storage
2b
Full
emergency shutdown
Only in the event of a fault (or briefly, < 15 s, with no
fault memory entry):
– Severe undervoltage in electrical system
(< 11.5 V for > 1.5 s or < 10.8 V for > 0.5 s)
Note: Full emergency shutdown on starting is also set
up to 15 s after starting depending on engine control
unit release. There is no fault memory entry in this case
as deactivation is only for a very restricted period and
is not registered by the driver.
30
Control stages
1
Continuous
power regulation
2a
Partial
emergency
shutdown
2b
Full
emergency
shutdown
Maximum
power
Minimum
power
Minimum
power
Minimum
power
Heated rear
window
approx. 320 W
0W
0W
0W
Heated
windscreen
1000 W
250 W
250 W
0W
Heating system
Seat heating
Front: 2 x 100 W
Rear: 2 x 80 W
Front: 2 x 25 W
Rear: 2 x 20 W
Front: 2 x 25 W
Rear: 2 x 20 W
0W
Rear additional
heater
2 x 250 W
2 x 50 W
2 x 50 W
0W
Steering wheel
heating
approx. 100 W
No
restriction
0W
0W
20 to 100 W
No
restriction
0W
0W
2 x 30 W
No
restriction
0W
0W
Jet and fluid
hose
heating
Mirror
heating
31
Control Units
Battery voltage regulation
The energy management control unit J644
informs the alternator of the specified
alternator voltage required via a data wire
(bit-synchronous interface). This voltage is
then set by the alternator. The battery
manager (function module 1) determines the
specified value from battery temperature and
battery charge. The specified value
established is then transferred in the control
unit to the dynamic management (function
module 3), which relays the value to the
alternator.
The assisted fault-finding routine contains
measured value blocks for checking the
specified alternator voltage and
communication via the data wire. The
specified alternator voltage can be altered for
diagnosis purposes as part of final control
diagnosis.
Function module 1
Function
module 3
J644
Specified alternator
voltage
Alternator
SSP287_020
Load shedding
The energy management control unit can
reduce the engine load (e.g. on accelerating)
if so requested by the engine control unit.
If the engine control unit requests load
shedding, the energy management system
reduces heavy-duty loads in the first stage and
alternator voltage in the second stage to lower
the level of alternator power input. For this
purpose, the energy management control unit
transmits a request via the convenience CAN
to the Climatronic control unit J255, which
regulates various heating systems, such as
heated windscreen, seat heating, heated rear
window and additional heater.
J623
Load shedding
request
J533
Load shedding
feedback
J644
SSP287_062
32
Regulation of heavy-duty heating systems
By way of the Climatronic control unit J255, the
energy management control unit J644 infinitely
regulates the heat output of
–
–
–
–
J644
Windscreen
Rear window
Rear additional heater
and seat heating
In doing so, it determines the maximum heat
output which can be provided.
J255
Heat output
SSP287_021
Heated windscreen (LIN bus)
Rear additional heater (LIN bus)
Seat heating (discrete wire)
Heated rear window
Idling speed increase
To ensure optimum electrical system supply and
battery charging, the energy management system
can request the engine control unit to increase
the idling speed in stages (7 % and 12 %).
Alternator activation (start load response)
J623
Engine speed
feedback
On starting the engine, the alternator power input
is minimised in order to optimise the starting
process.
J533
Alternator control dynamics
(drive load response)
When the heated rear window is switched on, the
alternator voltage is not increased immediately,
but rather adjusted within 3, 6 or 9 s as a function
of engine speed and temperature. This
continuous, infinitely variable regulation of the
alternator torque results in uniform engine
loading.
Idling speed increase
request
BSI
J644
Alternator
SSP287_115
33
Control Units
Fault memory entry
Activation of a deactivation stage by the
energy management control unit restricts the
functioning of certain systems. A fault
memory entry is made in the energy
management control unit, e.g.:
Vehicle self-diagnosis
02 - Interrogating fault memory
61 - Battery control
4E0915181
ENERGY MANAGER H02 0070
1 fault detected
Dealership number 0
02275
Closed circuit stage 4
000
– Alternator mechanical fault
– Alternator electrical fault
– Alternator high-temperature regulation
The accompanying data for the corresponding
fault memory entries contains additional
information, such as mileage or date at/on
which a fault was stored.
Measurement
Vehicle selfdiagnosis
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SSP287_022
Measured value blocks
Assisted fault-finding permits call-up of
measured values, such as
–
–
–
–
–
–
–
–
–
–
Specified alternator voltage
Battery voltage
Busbar temperature
Battery temperature
State of charge (SOC)
Communication with alternator
Mean closed-circuit current value
Emergency shutdown
Closed-circuit deactivation
Internal battery resistance, charge loss
Assisted fault-finding
Functional test
J644 - Display measured value blocks
Audi
V05.02 18/06/2002
Audi A8 2003>
2003 (3)
Saloon
BFM 4.2l Motronic / 246 kW
Measured value block 1
Functional
description
14.4 V
Specified alternator voltage
13.75 V
Battery voltage
54.84 %
DF signal
3s
Load response time
in the measured value blocks.
Measurement
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SSP287_023
34
Final control diagnosis
Final control diagnosis can be used to alter
the specified alternator voltage for diagnosis
purposes.
Specified alternator voltages of 15 V and
13.5 V can be set.
It must then be possible to measure the
value correspondingly set as alternator
specification at the alternator terminal.
Assisted fault-finding
Functional test
Audi
V05.02 18/06/2002
Audi A8 2003>
2003 (3)
Saloon
BFM 4.2l Motronic / 246 kW
Selection
This test is intended for implementation of control
element tests for the energy management control
unit. The following control element tests can be
performed.
-1-
-2-
-3-
1. Specified alternator voltage 15 V
2. Specified alternator voltage 13.5 V
3. End of program
Measurement
Vehicle selfdiagnosis
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SSP287_054
Service work
Battery diagnosis
In the Audi A8 ´03, the battery is tested by the
energy management control unit. Checking
the battery with a load test is no longer
necessary. Assisted fault-finding permits callup of the "Function and component selection"
menu, from which the battery test is started.
The control unit determines the state of
charge (SOC), internal battery resistance and
energy flow and uses these to calculate
whether the battery is OK, charged or in need
of replacement.
35
Control Units
Battery charging
The battery charger must be connected with
the external starting tap at the battery
positive terminal and the negative terminal at
the external starting pin. The battery should
always be re-charged in the vehicle. This
enables the energy management control unit
to incorporate the charging current into the
battery value calculations. When working on
the vehicle with terminal 15 ON and engine
off, a battery charger should always be
connected up, as otherwise functions may be
deactivated on account of excessive current
consumption.
The chargers used must be capable of
supplying a stabilised current of at least 30 A.
SSP287_068
External starting pin
Rapid charging of the battery in the
vehicle is not permitted.
External starting tap
Heed the battery and equipment
manufacturers' specifications when
charging the battery.
Also pay attention to the information
on the battery itself.
36
Battery replacement
External starting
On battery replacement, the new battery
must be adapted by way of the diagnosis
tester. The menu item "Battery manager
encoding" is provided in the assisted faultfinding routine in the list of systems with selfdiagnosis capability in the battery manager.
The battery serial number has to be entered
for encoding. This is marked on the battery.
For external starting, the starter cable
earth is to be connected to the external
starting pin and the positive cable to the
external starting tap.
37
Control Units
Control unit with display in
dash panel insert J285
SSP287_077
Instrument illumination
controls
The dash panel insert in the Audi A8 ´03 has
been modified with respect to the
predecessor model. Certain functions have
been changed.
Auto-Check system
Reset button
for trip recorder
Immobilizer
The immobilizer function has been
incorporated into the entry and start
authorisation control unit J518.
New features:
– No gateway
– Immobilizer function no longer in dash
panel insert
– Modified vehicle-speed signal input
– No immobilizer warning lamp
– Modified fuel gauge G1
– Modified coolant-temperature gauge
Gateway
On account of additional new functions, the
data bus diagnostic interface (gateway) J533
is now designed as a separate, external
control unit.
38
Adaption to the immobilizer is therefore no
longer necessary on replacing dash panel
insert.
There is thus no longer any connection
between an immobilizer fault and the
dash panel insert.
Immobilizer warning lamp
Fuel gauge G1
The immobilizer warning lamp has been
discontinued. In the event of a key
identification fault, a signal is transmitted by
the entry and start authorisation control unit
J518. "Safe" then appears in the mileage
display.
The input signal is now provided by four fuel
gauge senders in the fuel tank, all of which
are evaluated separately.
This display is also used to show the number
of keys to be matched and the number
already matched on vehicle key adaption.
Coolant-temperature gauge G21
Vehicle-speed signal
Fuel gauge sender operation is described in
SSP 282 – Audi A8 ´03 Technical Features.
The input signal for the coolant-temperature
gauge is no longer supplied by the coolanttemperature sender G62, but rather it is
transmitted by the engine control unit to the
dash panel insert.
The vehicle-speed signal is now supplied by
the ABS with EDL control unit J104 via the
drive system CAN.
The wheel circumference must be
available to the dash panel insert to
ensure correct evaluation of the vehiclespeed signal.
The permissible wheel circumferences are
included in the encoding and selected by way
of assisted fault-finding.
39
Control Units
Block diagram
30
15
G34
G35
G266
J489
J540
F34
J285
J49
J17
1
J533
P
F1
F77
F66
G17
M
G393 G237 G23
M
G169
G
G6
SSP287_036
Key
F1
F34
F66
F77
G
G6
G17
G23
G34
G35
G169
G237
G266
G393
40
Oil pressure switch
Brake fluid level warning contact
Coolant shortage indicator switch
Windscreen washer fluid warning
contact
Fuel gauge sender
Fuel pump (pre-supply pump)
Ambient temperature sensor
Fuel pump
Brake lining/pad wear sender, front left
Brake lining/pad wear sender, front right
Fuel gauge sender 2
Fuel gauge sender 3
Oil level/oil temperature sender
Fuel gauge sender 4
J17
J49
J285
J489
J533
J540
Fuel pump relay
Electric fuel pump 2 relay
Control unit with display in dash panel
insert
Radio controlled clock receiver
Data bus diagnostic interface
Electric park and handbrake control
unit
Additional signal
1 Terminal 58s
Convenience system
central control unit J393
Use is made in the Audi A8 ´03 of the familiar
convenience system central control unit J393
from the Audi A2 and Audi A4. The tasks and
functions have been adapted accordingly to
suit the requirements of the Audi A8. The
control unit is connected to the convenience
CAN.
SSP287_048
Fitting location
The convenience system central control unit
is installed at the rear right of the luggage
compartment above the battery.
Master functions
SSP287_069
The master functions of the convenience
system central control unit are as follows:
– LIN master for boot lid control unit J605
and anti-theft/tilt system control unit J529
– Central locking master
– Flashing signal master
– Anti-theft alarm master
Convenience CAN
J393
LIN master
As LIN master for the LIN slaves (boot lid
control unit J605 and anti-theft/tilt system
control unit J529), the convenience system
central control unit is designed to provide all
the information required by the LIN slaves to
execute their functions on the LIN bus and to
call up the necessary data for function
implementation from the LIN slaves.
LIN bus
J605
J529
SSP287_070
41
Control Units
Central locking master
J393
As central locking master, the task of the
convenience system control unit is to control
the central locking function. By way of the
convenience CAN, the control unit reads in
the door opening authorisation from the
entry and start authorisation control unit
J518. The convenience system central control
unit then transmits the command for
opening/closing the doors to the door control
units via the convenience CAN.
Central locking control is described in
SSP 288 - Audi A8 ´03 Distributed
Functions.
Door opening
authorisation
J386
J387
J388
J389
Door opening
authorisation
J518
SSP287_071
Flashing signal master
As flashing signal master, the convenience
system central control unit evaluates the
incoming flashing mode requests and passes
the corresponding flashing mode to the
convenience CAN in line with the internal
priority list.
Flashing modes include turn signals,
motorway signalling, anti-theft alarm flashing
and central locking system flashing.
As several flashing requests may be received
simultaneously, priorities must be assigned
to flashing modes. The control units involved
in the "flashing" function read in the flashing
mode from the convenience CAN and actuate
their outputs accordingly.
42
Control of the flashing signal system is
also described in SSP 288 - Audi A8 ´03
Distributed Functions.
Diebstahlwarnanlagenmaster
F2
F3
Convenience
CAN
F266
J386
J387
F218
J393
J519
J388
H12
J389
J529
J528
F10
As anti-theft alarm master, the control unit
evaluates the corresponding vehicle
monitoring information and actuates the antitheft output media as required.
All components are simultaneously primed/
deactivated. When the anti-theft alarm
system is primed, all door contacts, the
bonnet contact, the boot lid contact, the
passenger compartment and vehicle tilt are
monitored.
F11
SSP287_075
F2
F3
Door contact switch – driver side
Door contact switch – front passenger
side
F10 Rear left door contact switch
F11 Rear right door contact switch
F218 Boot lid central locking switch
F266 Bonnet contact switch
H12
Alarm horn
J386
J387
J388
J389
J393
Door control unit, driver side
Door control unit, front passenger side
Door control unit, rear left
Door control unit, rear right
Convenience system central control
unit
J519 Onboard power supply control unit
J528 Sunroof electronics control unit
J529 Anti-theft/tilt system control unit
43
Control Units
Actuation
Rear left and right footwell lights
The convenience system central control unit
actuates the rear footwell lights.
Rear roller blind
The rear roller blind can be operated with the
rear roller blind switch or via the rear roof
console. The rear roller blind switch is read in
by the Climatronic control unit and
transmitted to the convenience CAN. The rear
roof module operating unit information is
read in by the sunroof electronics control unit
and transmitted to the convenience CAN. The
convenience system central control unit
reads in the rear roller blind actuation
information from the convenience CAN and
actuates the rear roller blind motor
accordingly.
The actuation time and brightness value are
specified by the sunroof electronics control
unit J528.
Convenience CAN
J255
E149
J528
E467
J393
V91
E149 Rear roller blind switch
E467 Rear roof console
J255 Climatronic control unit
J393 Convenience system central control
unit
J528 Sunroof electronics control unit
V91
Rear roller blind motor
SSP287_076
Luggage compartment lights
Opening the boot lid causes the convenience
system central control unit to actuate the
luggage compartment light W3, the left
luggage compartment light W18 and the right
luggage compartment light W35. The lighting
is switched off with terminal 15 ON when the
boot lid is closed or the vehicle speed
exceeds 2 km/h.
44
With terminal 15 OFF, the lighting is again
switched off by the control unit on closing the
boot lid or on completion of the maximum
operating time of 10 minutes. Following timebased deactivation, the lighting can only be
re-activated if the driver's or front passenger's
door and the boot lid are opened or terminal
15 is activated.
Heated rear window Z1
The convenience system central control unit
actuates the heated rear window via the
heated rear window relay J9. The relay
actuation information is supplied to the
convenience system central control unit by
the Climatronic control unit.
System outline
The convenience system central
control unit J393 receives the
following input signals:
–
–
–
–
Boot lid soft touch
Lock cylinder CLOSED
Brake light switch
Brake light signal from ABS with
EDL control unit J104
–
–
–
–
Crash input
Boot lid contact
Tank filler flap detection
Boot lid power latching system
feedback
–
–
–
–
High-level brake light (LED)
Left and right tail light (LED)
Left and right brake light (LED)
Rear left and rear right brake light
(LED)
Left and right reversing light
Left and right rear fog light
Number plate light
Heated rear window Z1
Alarm horn H12
The convenience system central control
unit J393 actuates the following loads:
–
–
–
–
–
–
–
–
Rear left and right footwell lights
Luggage compartment lights
Rear roller blind motor V91
Fuel tank filler flap central locking
actuator F219
Boot lid control unit J605
Boot lid power latching system
Boot lid release motor V139
Left and right turn signal indicator
(LED)
–
–
–
–
–
45
Control Units
Block diagram
30
15
J657
J529
M
J605
E406
L76
W18
W3
W35
J393
J690
M9 M4 M6
J692
M9 M4 M16 L46
J693
L47 M17 M2 M10
J691
M8 M2 M10
Key
C18
Windscreen aerial suppression filter
E406 Boot lid close button in luggage
compartment
F124 Contact switch in lock cylinder for boot
lid anti-theft alarm system/central
locking system
F218 Boot lid central locking switch
F248 Release button for boot lid lock cylinder
H12
Alarm horn
J9
Heated rear window relay
J393 Convenience system central control
unit
J529 Anti-theft/tilt system control unit
J605 Boot lid control unit
J657 Power latching control unit
46
J690 Left tail light control unit
J691 Right tail light control unit
J692 Tail light control unit for lights on left in
boot lid
J693 Tail light control unit for lights on right
in boot lid
L46
L47
L76
Rear fog light bulb, left
Rear fog light bulb, right
Button illumination
M2
M4
M6
M8
M9
M10
M16
M17
M25
Tail light bulb, right
Tail light bulb, left
Turn signal bulb, rear left
Turn signal bulb, rear right
Brake light bulb, left
Brake light bulb, right
Reversing light bulb, left
Reversing light bulb, right
High-level brake light bulb
M
F218
V53
F124
F248
H12
J9
C18
Z1
1
M
X
M25
W45
W46
2
3
4
5
6
M
V155
V91
SSP287_035
V53 Central locking motor, boot lid
V91 Rear roller blind motor
V155 Tank filler flap locking motor
W3
W18
W35
W45
W46
Luggage compartment light
Left luggage compartment light
Right luggage compartment light
Rear left footwell light
Rear right footwell light
X
Number plate light
Z1
Heated rear window
Additional signals
1
Convenience CAN High
2
Convenience CAN Low
3
Brake light switch F
4
ESP brake signal from ABS with EDL
control unit J104
5
Crash signal from airbag control unit J234
6
"Doors OPEN" signal to adaptive
suspension control unit J197
47
Control Units
Tail light actuation
Brake/
tail light on
boot lid
Brake/
tail light on
side panel
Rear fog
light
Turn signal
indicator
Reversing
light
Reflector
SSP287_030
Some of the rear light units are of diode type
(turn signal indicators, tail lights and brake
lights). Each has an integrated microprocessor
for actuation.
The diodes are arranged in a matrix. If one
diode fails, the other diodes for this function
continue to light.
The microprocessor governs whether the red
LEDs operate as tail light (approx. 10 % PWM
signal) or as brake light (approx. 97 % PWM
signal).
This simplifies the wiring and various emergency
functions can be implemented.
Total failure or malfunctioning of the internal
transistor is detected by the microprocessor,
which transmits a fault message to the
convenience system central control unit J393.
The turn signal LEDs are actuated in the same
manner as the tail light LEDs, however there is
no PWM control.
Tail/
brake light
1
Tail light signal
2
Brake light signal
3
Bidirectional wire from
convenience system central control unit
4
Indicator signal
Turn signal
indicator
SSP287_117
1
48
2
3
4
Boot lid
control unit J605
The boot lid control unit provides extra
convenience when opening and closing the
boot lid. The electromechanical drive system
with a motor and magnetic clutch is
controlled electronically and responds to
requests from the convenience system
central control unit.
The current position status and the switching
status of the boot lid closing button are
signalled to the convenience system central
control unit.
The boot lid control sequence is measured
by way of an integrated potentiometer.
This permits
– Detection of the end positions
– Detection of excess force and thus
implementation of obstruction safeguard
through evaluation of the rate of change
Operation
Opening/closing involves engagement of the
magnetic clutch and starting of the motor.
During movement, the current position of the
boot lid is detected via the potentiometer and
compared to the previous value. If there are
no problems, the boot lid is moved into the
desired end position, where the drive is
switched off.
In the event of an obstruction or opposing
force during opening/closing, movement is
halted by disengaging the magnetic clutch
and the motor comes to a stop. If it was being
closed, the boot lid is opened again
(obstruction safeguard).
Hinge mechanism
Drive shaft
Control electronics
Potentiometer
Electrical
connection
Magnetic clutch
Electric motor
SSP287_080
Gear
mechanism
49
Control Units
The boot lid control unit receives the input
signal from the boot lid close button in
luggage compartment E406.
For safety reasons, the boot lid cannot be
closed from the operating points in the
remote control key, in the driver's door or
on the outside of the boot lid.
SSP287_081
30
Block diagram
E406 Boot lid close button in luggage
compartment
J393 Convenience system central control
unit
J529 Anti-theft/tilt system control unit
J605 Boot lid control unit
L76
J529
J605
Button illumination
E406
L76
J393
SSP287_082
Fitting location
The boot lid control unit is located behind the
side panel at the top right and is flanged to
the right boot lid hinge.
SSP287_083
50
Anti-theft/tilt system
control unit J529
As in the Audi A4 ´01, use is made of a tilt
sensor to prevent unauthorised tow-starting.
The tilt sensor in the Audi A8 ´03 is an
independent control unit. The anti-theft/tilt
system control unit is connected to the
convenience system central control unit J393
via a LIN bus link.
SSP287_047
Design
The internal design and mode of operation
have been modified as compared to the tilt
sensor in the Audi A4 ´01.
Springs
The control unit contains the sensor element,
the microcontroller and a LIN transceiver.
The sensor consists of a moving earth
element suspended between two capacitor
plates by means of springs. The capacitor
plate connections are routed into the
microcontroller.
Capacitor
plates
Earth
element
Operation
A change in the horizontal position of the
control unit moves the earth element
between the capacitor plates within the
spring travel range.
SSP287_078
Microcontroller
A voltage is applied to the capacitor plates.
Movement of the earth element produces a
change in capacitance between the plates.
This voltage signal is recognised as a change
in vehicle tilt by the microcontroller. The
measuring range of the sensor is ± 25°. The
change in capacitance is evaluated with an
accuracy of 0.1°.
SSP287_079
51
Control Units
Block diagram
30
J393 Convenience system central control
unit
J529 Anti-theft/tilt system control unit
J605 Boot lid control unit
J529
J605
J393
SSP287_074
Fitting location
The anti-theft/tilt system control unit is
located on the right beneath the rear seat
bench.
SSP287_029
Diagnosis
The absolute tilt angles can be displayed in
the measured value blocks.
In addition, with the anti-theft alarm primed,
it is also possible to read out the change in
angle with respect to the angle on priming
the anti-theft alarm.
Diagnosis for the anti-theft/tilt system control
unit is performed by way of the central
convenience electronics.
52
Onboard power supply
control unit J519
Functions
The onboard power supply control unit was
first used in the Audi A4 ´01. It is also fitted
with appropriately modified functions and
actuation processes in the Audi A8 ´03.
The onboard power supply control unit is
designed to read in various switches and
actuate certain outputs.
Master functions
SSP287_045
The master functions of the onboard power
supply control unit are as follows:
– LIN master for wiper motor control unit
J400 (refer to wiper motor for functions)
– Light master
As light master, the task of the onboard
power supply control unit is to provide all
control units concerned with the required
type of lighting, e.g. side lights, via the data
transfer systems to enable the control units
to actuate the appropriate control elements.
In addition, it monitors operation of the front
external vehicle lights. This takes the form of
cold and warm lamp monitoring.
Exterior lighting control is described in
SSP 288 – Audi A8 ´03 - Distributed Functions.
Substitute master function
J519
J400
SSP287_032
The onboard power supply control unit
assumes the substitute master function for
the convenience system central control unit
J393. In other words, if the convenience
system control unit is disconnected from the
CAN bus or defective, the onboard power
supply control unit transmits the flashing
signal information to the CAN bus (refer to
SSP 288 – Audi A8 ´03 - Distributed Functions).
53
Control Units
Block diagram
75X
30
15
E266 L117 K136 E149 L76
E
L76
K145
E3
K6
E256 L76
1
1
2
3
4
5
6
7
J519
1
8
J667
J668
M
L13 M51 M30
M1 M5 V48
9
J431
M
L14 M52 M32
M3 M7 V49
Key
E1
E3
E7
E18
E26
E149
E256
E266
E462
F266
G357
54
G358
H2
H7
J4
J400
J431
J519
J667
J668
Light switch
Hazard warning light switch
Fog light switch
Rear fog light switch
Glove box light switch
Rear roller blind switch
TCS/ESP button
Parking aid button
Open/close button for front display
Bonnet contact switch
Steering column adjustment sender,
vertical
Steering column adjustment sender, axial
High-tone horn
Low-tone horn
Dual-tone horn relay
Wiper motor control unit
Headlight range control unit
Onboard power supply control unit
Power output module for left headlight
Power output module for right headlight
K4
K6
K13
K17
K136
K145
L9
L13
L14
L22
L23
L76
L117
M1
M3
M5
M7
M18
M19
Side light warning lamp
Hazard warning light system warning
lamp
Rear fog light warning lamp
Fog light warning lamp
Parking aid warning lamp
Airbag disabled warning lamp,
front passenger side
Light switch light bulb
Left gas-discharge lamp
Right gas-discharge lamp
Fog light bulb, left
Fog light bulb, right
Button illumination
Parking aid switch illumination
Side light bulb, left
Side light bulb, right
Turn signal bulb, front left
Turn signal bulb, front right
Side turn signal bulb, left
Side turn signal bulb, right
E7
E18 K4 K13 K17 L9
V5
J400
M
E1
J4
H2
H7
2
10
M
M18
M19
L22
L23
F266
W9
W10
Main beam bulb, left
Main beam bulb, right
Static cornering light, left
Static cornering light, right
Windscreen washer pump
Headlight range control motor, left
Headlight range control motor, right
Steering column adjustment motor,
vertical
V124 Steering column adjustment motor,
axial
W6 Glove box light
W9 Left footwell light
W10 Right footwell light
M
W6 G357 V123 G358 V124
E26
M30
M32
M51
M52
V5
V48
V49
V123
11
SSP287_034
SSP287_034
Additional signals
1 Parking aid control unit J446
2 Terminal 58s
3 Parking aid control unit J446
4 Climatronic control unit J255
5 Multimedia operating unit E380
6 Airbag control unit J234
7 ABS with EDL control unit J104
8 Drive system CAN High
9 Drive system CAN Low
10 Convenience CAN High
11 Convenience CAN Low
55
Control Units
Versions
There are two versions of the onboard power
supply control unit:
– Low-line
– High-line (with electrical steering column
adjustment)
Fitting location
The onboard power supply control unit is
installed at lower front left behind fuse box.
SSP287_053
Energy management
Deactivation stages
In the event of a low battery charge, load
deactivation must be performed by the
energy management control unit J644 (refer
to energy management control unit). The
necessary deactivation stage is transmitted
on the CAN bus and read in by the onboard
power supply control unit.
Transportation mode
If transportation mode is activated by the
diagnosis unit in the energy management
control unit, the onboard power supply
control unit deactivates various loads and
functions to minimise closed-circuit current.
56
System outline
The onboard power supply control
unit receives the following input
signals:
– Hall sensor 1 for steering column
adjustment height
– Hall sensor 2 for steering column
adjustment depth
–
–
–
–
Bonnet switch for anti-theft alarm
Rotary light switch
Hazard warning button
Reversing light switch (manual
gearbox)
The onboard power supply control
unit J519 actuates the following
loads:
– Front left and right turn signal
indicators
– Left and right side turn signal
indicators
– Front left and right side lights
– Left and right dipped beam
– Left and right main beam
–
–
–
–
–
Left and right fog light
Front left and right footwell lights
Horn
Steering column adjustment
Hazard warning button
illumination
– Glove box light
57
Control Units
Diagnosis
Measured value blocks
Measured value blocks are available, for
example, for the following functions:
Inputs
Remarks
Terminal 30
Remarks
Main beam
OFF/ON
Rotary light switch
Positions
Headlight flasher
OFF/ON
Hazard warning
button
OFF/ON
Turn signal
OFF/ON
Vehicle-speed signal
km/h
Steering column
adjustment
Axial/vertical position
Status (up, down, etc.)
Wipe/wash
Status
Bonnet contact
OFF/ON
Terminal 15
OFF/ON
Terminal X
OFF/ON
Terminal 50
OFF/ON
Outputs
Remarks
Light control
e.g. left side light
OFF/ON
Front footwell
lights
OFF/ON
Brightness value
Horn
OFF/ON
Basic settings
Basic steering column adjustment setting can
be made with the high-line version.
58
Inputs via CAN
Inputs via LIN
Remarks
Wipe
OFF/ON
Wash
OFF/ON
Park position
OFF/ON
Control element test
The control element test can be used to check the
following:
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
Hazard warning light system warning lamp K6
Side light bulb, left M1
Side light bulb, right M3
Dipped beam bulb, left M29
Dipped beam bulb, right M31
Main beam bulb, left M30
Main beam bulb, right M32
Fog light bulb, left L22
Fog light bulb, right L23
Left turn signal indicators
Right turn signal indicators
Left footwell light W9
Right footwell light W10
Wiper upper reversing position
Wiper lower reversing position
Windscreen washer pump V5
Dual-tone horn relay
Encoding
Encoding must be performed in the onboard
power supply control unit for
–
–
–
–
Daytime driving light
Assistant lighting system
Type of headlight
Footwell lighting
for example.
59
Control Units
Wiper motor
control unit J400
The wiper motor control unit J400 combines
the control electronics for the individual
wiper functions and the wiper motor in one
component.
As LIN slave control unit it is connected to the
onboard power supply control unit J519.
SSP287_051
Functions
– Actuation of windscreen washer pump V5
– Control of wipe angle functions
30
Block diagram
J400 Wiper motor control unit
J519 Onboard power supply control unit
V5
J519
Windscreen washer pump
V5
J400
M
Bonnet contact switch F266
Opening the bonnet with the wiper motor
running causes the motor to come to an
immediate halt. If the windscreen washer
pump is active on opening the bonnet, then
this is also switched off. Opening of the
bonnet is detected by two contact switches
connected to the onboard power supply
control unit J519.
60
SSP287_063
Operation
By way of the LIN bus, the onboard power
supply control unit provides the wiper motor
control unit with all the information required
to implement the wiper function.
J527
Windscreen washing
• Actuation of windscreen washer pump V5
The windscreen washer pump V5 actuation
information is transmitted by the steering
column electronics control unit J527 to the
convenience CAN. The onboard power
supply control unit J519 receives this
information and relays it via the LIN bus to
the wiper motor control unit J400, which
then actuates the windscreen washer pump
V5 and activates the wipers if these are not
yet in operation.
J519
V5
J400
SSP287_064
J527
• Actuation of wiper function
Wiper function
The wiper functions
– Intermittent
– Intermittent speeds
– Flick wipe
– Wipe speed 1
– Wipe speed 2
are made available to the onboard power
supply control unit by the steering column
electronics control unit J527 via the
convenience CAN. The onboard power
supply control unit J519 transmits a
message with the desired wiper function
via the LIN bus to the wiper motor control
unit J400.
J519
J400
SSP287_065
61
Control Units
Onboard power supply
control unit 2 J520
The onboard power supply control unit 2
J520 has been fitted for the first time in the
Audi A8 ´03. The great load on all other
control units necessitated the installation of
an additional control unit.
The following components are actuated:
–
–
–
–
–
Servotronic solenoid valve N119
Hose heater for windscreen washer system
Headlight washer system relay J39
Garage door operation control unit J530
Left and right pop-up washer jet motors
V248, V249
– Display opening mechanism for front
information and display and operating
unit control unit J685
– Terminal 58d (gate illumination)
SSP287_046
Master functions
The master functions of the onboard power
supply control unit 2 J520 are as follows:
– LIN master for garage door operation
control unit J530 (for functions, refer to
Pages 76/77)
J520
J530
SSP287_056
62
Block diagram
75x
30
15
J530
M
J39
V11
J711
Z58
J520
M
M
V248
M
V249
N119
F330
F331
1
2
3
4
V301
SSP287_058
Additional signals
Key
F330 Open display limit switch
F331 Close display limit switch
J39
J520
J530
J711
Headlight washer system relay
Onboard power supply control unit 2
Garage door operation control unit
Washer fluid heater relay
1 Selector lever illumination (terminal 58d)
2 Multimedia operating unit E380
(signal for MMI display "OPEN/CLOSE")
3 Convenience CAN High
4 Convenience CAN Low
N119 Servotronic solenoid valve
V11 Headlight washer system pump
V248 Pop-up washer jet motor,
left headlight washer system
V249 Pop-up washer jet motor,
right headlight washer system
V301 Open/close display motor
Z58
Heated fluid hoses
63
Control Units
Fitting location
The onboard power supply control unit 2
J520 is located beneath the front passenger's
seat.
System outline
SSP287_028
The onboard power supply control unit 2
J520 receives the following input signals:
– Open/close display limit switches
F330 and F331 for front information
and display and operating unit control
unit J685
– Open display during wake-up of bus
systems (refer to SSP 293 – Audi A8 ´03
Infotainment)
The onboard power supply control unit 2
actuates the following loads:
– Servotronic solenoid valve N119
(refer to SSP 292 – adaptive air
suspension in the Audi A8 ´03)
– Hose heater for windscreen washer
system
– Headlight washer system relay J39
(fluid pump), left and right pop-up
washer jet motor V248 and V249
64
– Opening of display for front
information and display and operating
unit control unit (for operation, refer to
SSP 293 – Audi A8 ´03 Infotainment)
– Terminal 58d for gate illumination
Hose heater for windscreen washer system
Temperature
[°C]
10
5
Switching status of hose
heater relay
ON
SSP287_059
OFF
Time [t]
The windscreen washer system hose heater is
actuated via a relay energised by the onboard
power supply control unit 2 J520.
The hose heater is switched as a function of
ambient temperature.
It is switched off at + 10 °C.
If the temperature drops below + 5 °C,
the heater is switched on again.
Vehicle-speed signal
Servotronic solenoid valve N119
The Servotronic solenoid valve is actuated by
the onboard power supply control unit 2
J520 by way of a pulse-width modulated
signal. Current measurement is performed in
the control unit on the earth end for pulse
width regulation. Depending on vehicle
speed, the current flowing through the
solenoid valve (corresponds to voltage at
resistor) is regulated to 0 … 800 mA by the
control unit. The onboard power supply
control unit 2 receives the vehicle-speed
signal from the convenience CAN.
J520
PWM signal
N119
SSP287_099
65
Control Units
Headlight washer system
Switching statuses
ON
ON
ON
ON
Washer fluid
pump
Raise
Left jet
Lower
Raise
Right jet
Lower
SSP287_060
The onboard power supply control unit 2
J520 actuates one washer fluid pump and two
pop-up washer jet motors. The washer fluid
pump is actuated via the headlight washer
system relay J39, which is energised by the
onboard power supply control unit 2.
The pop-up washer jet motors are switched
directly by the control unit. As washing takes
place during raising and lowering, the fluid
jet is thoroughly distributed.
The headlight washer system jets do not
clean the twin lights simultaneously, but
rather consecutively, so as to prevent any loss
of lighting power.
Energy management
66
Deactivation stages
Transportation mode
The onboard power supply control unit 2 also
deactivates loads/functions if a
corresponding deactivation stage is
transmitted on the CAN bus by the energy
management control unit. The functions
deactivated are indicated under "Vehicle
information" in the assisted fault-finding
routine.
Transportation mode causes loads/functions
to be deactivated in the onboard power
supply control unit 2. The information for
initiation of the transportation mode is
supplied to the onboard power supply control
unit 2 via the bus systems by the energy
management control unit (refer to energy
management control unit).
Diagnosis
Measured value blocks
Measured value blocks are available, for
example, for the following functions:
– Display opening/closing function for front
information and display and operating
unit control unit
– Headlight washer system
– Hose heater
– Garage door opening
– Energy manager deactivation stages
– Servotronic
– Component protection
– Communication
Control element test
The control element test can be used to check
the following functions:
– Opening/closing display for front
information and display and operating
unit control unit
– Terminal 58d
– Servotronic full/no power assistance
– Raise pop-up washer jet for left headlight
washer system
– Raise pop-up washer jet for right headlight
washer system
– Headlight washer system fluid pump
– Hose heater
– Garage door opener buttons 1/2/3
Encoding
Encoding must be performed in onboard
power supply control unit 2 for the following
–
–
–
–
Servotronic (with/without)
Garage door opening (with/without)
Headlight washer system (with/without)
Heated wipe/wash fluid reservoir
(with/without)
– Terminal 58d (type of gearbox)
for example.
67
Control Units
Door control units J386 to
J389
Door control units were used for the first time
in the Audi A2. They are fitted with
appropriately modified functions and actuation
processes in the Audi A8 ´03. The door control
units are designed to read in all switches in the
corresponding door and to actuate the motors,
lights and heaters fitted in the doors.
Substitute master function
SSP287_087
The driver side door control unit J386 assumes
control of the central locking system in the
event of failure of the convenience system
central control unit J393. If the driver side door
control unit detects a break in communication
with the convenience system central control
unit, the information of the driver side door
control unit is evaluated directly by the other
door control units.
In this case, it is no longer possible to open the
vehicle by way of remote control or Advanced
Key function.
"Ambiente" lighting in doors (optional)
Versions
Low-line and high-line versions are available.
The high-line version features the following
additional functions
– Automatic anti-dazzle mirror
and
– Mirror folding
Footwell lighting
"Ambiente" lighting refers to lights which are
active whilst driving. Certain "ambiente"
lighting components are also integrated into
the interior door trim, for example the light
strip in the door pocket and the vertical light in
the interior trim.
The light strip in the door pocket is actuated by
the door control unit with the terminal 58s
function. The level of the variable "ambiente"
lighting is set via the multimedia interface and
stored in the sunroof electronics control unit.
As interior light master, the sunroof electronics
control unit supplies the door control units
with these settings by way of the convenience
CAN. The door control units actuate the vertical
light in the door trim as PWM signal.
Diagnosis
Address words 42, 52, 62 and 72 "Door
electronics" are available for diagnosis.
68
Door contour lighting
SSP287_098
Door pocket lighting
The door control units receive the
following input signals:
–
–
–
–
–
–
–
Window lifter switch
Interior locking switch
Door contact switch
Central locking actuators
Central locking actuators (safe)
Outer door handle switch (optional)
Contact sensor, outer door handle
(optional)
Additionally for front doors:
– Memory operating unit
– Mirror position sender
– Mirror disengaging switch
Additionally for driver's door:
– Contact switch in lock cylinder, driver
side F241
– Luggage compartment release switch
E164
– Tank filler flap remote release switch
E204
– Child safety lock switch E254
– Mirror adjustment changeover switch
E48
– Mirror adjustment switch E43
– Mirror with folding function,
adjustment switch E168
– Alarm system OFF switch E217
(optional)
– Interior monitor switch E183
(optional)
Rear passenger's side only:
– Remote control button, front
passenger seat (optional) E351
The door control units actuate the
following loads:
–
–
–
–
–
–
–
Central locking motors
Central locking motors (safe)
Door warning lights
Entry lights
Door opener lighting
Door pocket light strips (optional)
Vertical light for door trim
(optional)
– Outer door handle lighting
(optional)
Additionally for rear doors:
– Rear ashtray light
Additionally for front doors:
– Mirror adjustment motors
– Mirror folding motors
– Heated exterior mirrors
– Automatic anti-dazzle exterior
mirror
– Ambient lighting
Additionally for driver's door:
– Central locking warning lamps
– Vehicle inclination sender warning
lamp (optional) K188
– Interior monitoring off warning
lamp (optional) K162
69
Control Units
Sunroof electronics
control unit J528
In view of the wide range of front roof module
functions, this takes the form of an
independent control unit in the Audi A8 ´03.
Interior monitor
sensors
Control unit
For exchange of data with other control units,
the sunroof electronics control unit is
connected to the convenience CAN. There is a
link with the sliding sunroof motor V1 by way
of the LIN bus.
SSP287_116
Direction of
travel
Garage door opener
buttons
Microphone 3
Microphone 2
Interior light
button
Telematics
operating unit E264
Rotary switch
for sunroof
Direction of
travel
Microphone 1
Reading light button
SSP287_100
Lighting profile button
70
Function
The sunroof electronics control unit is the
function master for the interior lighting
distributed function. There is no substitute
master.
It assumes the following control functions in
the Audi A8 ´03:
– Control of lighting profiles (interior
lighting)
– Sunroof control signals
The control unit reads in the following signals
and relays them on the convenience CAN:
– Interior monitor without anti-theft alarm is
relayed to the convenience system central
control unit J393
– EC interior mirror is relayed to all door
control units J386, J387, J388 and J389
– Light sensor signal is relayed to onboard
power supply control unit J519
– Humidity and windscreen temperature
sender signal is relayed to Climatronic
control unit J255
– Garage door opener button is relayed to
onboard power supply control unit 2 J520
In addition, interior lighting control signals are
transmitted via discrete wires to the rear roof
console E467.
Lighting profiles
Certain preset profiles can be selected for the
interior lighting via the MMI (CAR function).
These profiles provide vehicle lighting
conditions to suit the driving situation and
individual requirements.
Benefits:
– Greater clarity in the vehicle
– Improved driving conditions
– More pleasant atmosphere
SSP287_100
If lighting profile "OFF" has been
selected in the MMI, the interior lighting
is not switched on when the light button
in the roof module is pressed.
71
Control Units
The following lighting profiles are available:
Highway profile
Actuation of
– Front right and left door trim vertical light
– Rear right and left door trim vertical light
Car
User
Logbook
"Ambiente" lighting
Highway
City profile
City
Cockpit
Actuation of
–
–
–
–
Driver's footwell light (50 %)
Front passenger's footwell light (50 %)
Rear footwell lights (30 %)
Front, rear right and rear left door trim
vertical light (100 %)
– Front and rear interior lights (15 %)
Cockpit profile
Actuation of
– Driver's footwell light (50 %)
– Front passenger's footwell light (50 %)
– Front, rear right and rear left door trim
vertical light (100 %)
Rear profile
Actuation of
– Rear footwell lights (30 %)
– Rear right and left door trim vertical light
(100 %)
– Rear interior lights (15 %)
Restriction of functions
The following are deactivated in the event of
active load intervention by the battery and
energy management system:
–
–
–
–
72
Interior lighting
Sunroof
Light/humidity sensor
Interior mirror
Rear
Off
Systems
TP
Maintenance
SSP287_114
Interior lights actuated by lighting profiles
Front interior light
Rear interior light
Door trim vertical light
Front footwell light
Rear footwell light
SSP287_119
Diagnosis
The sunroof electronics control unit is
incorporated into the vehicle self-diagnosis
function by means of address word 38.
Individual encoding can be performed with
VAS 5051 by way of assisted fault-finding and
on the basis of vehicle equipment.
All input and output signals can be displayed
via the "Measured value block" function. The
diagnosis unit only indicates the last 5 faults;
the oldest fault code in each case is
overwritten.
73
Control Units
Block diagram
30
30
W20
F147
W14
F148
V1
M
1
2
J528
R164 E264 G273 G274 E139
E284
W16
W17
E326
E328
Y7
G399 G260
Key
C20
Solar cells
E139
E264
E284
E326
E327
E328
E329
E383
E384
E385
E467
Sliding sunroof adjustment regulator
Telematics operating unit
Garage door operating unit
Front interior light button
Rear interior light button
Front reading light button
Rear reading light button
Rear left roller blind button
Rear right roller blind button
Rear switch for rear roller blind
Rear roof console
F147 Vanity mirror contact switch, driver side
F148 Vanity mirror contact switch, front
passenger side
74
G260
G273
G274
G399
Humidity sender, air conditioner
Interior monitoring sensor
Interior monitoring sensor
Light sensor
J528 Sunroof electronics control unit
R164 Microphone unit in front roof module
V1
Sliding sunroof motor
W11 Rear left reading lamp
W12 Rear right reading lamp
W14 Illuminated vanity mirror, front
passenger side
C20
W49
W50
3
J707 /E467
SSP287_066
W47
W48
W11
W12
E327
W16
W17
W20
W47
W48
W49
W50
Left interior light
Right interior light
Illuminated vanity mirror, driver side
Rear left interior light
Rear right interior light
Illuminated vanity mirror, rear left
Illuminated vanity mirror, rear right
Y7
Automatic anti-dazzle interior mirror
E329
E383
E384
E385
Additional signals
1 Convenience CAN High
2 Convenience CAN Low
3 Fresh-air blower control unit J126
75
Control Units
Garage door operation
control unit J530
The garage door operation control unit J530
permits remote control of the garage door
drive mechanism by the driver using the
controls in the vehicle. Up to three different
garage door drive mechanisms (or other
compatible systems) can be matched to three
buttons in the front roof module.
SSP287_052
Control
Control is implemented by way of three
buttons in the front roof module. System
matching is implemented with the genuine
remote control unit of the garage door drive
mechanism manufacturer. The indicator light
in the roof module must flash for this. The
vehicle turn signal indicators provide
feedback on correct implementation of the
matching procedure.
SSP287_111
Indicator lamp
Fitting location
The garage door operation control unit is no
longer located in the sun visor, but rather
behind the front left bumper.
This change in location was necessary
because the windscreen is made of a special
insulating glass which would prevent
propagation of the radio waves.
SSP287_113
76
Function master
The master control unit for the garage door
operation control unit is the onboard power
supply control unit 2 J520. Both are interlinked
by way of the LIN. There is no substitute master
function.
J393
Operation
J528
The garage door operation buttons can be
actuated by way of the sunroof electronics.
The sunroof electronics control unit J528
transmits the information "Button 1", "Button 2"
or "Button 3" on the convenience CAN.
J520
The information is read in by the onboard
power supply control unit 2 and relayed via the
LIN to the garage door operation control unit.
The corresponding command stored in the
garage door operation control unit is
transmitted by means of radio waves and the
matching garage door or other compatible
systems open(s).
J530
SSP287_112
Distributed functions
Restriction of functions
The signals learned and the remote control
encoding for the garage doors are stored in
the garage door operation control unit J530.
Active load intervention by the battery
management system does not result in
deactivation.
The confirmation flashing function is stored
in the convenience system central control unit
J393.
Component protection
The onboard power supply control unit 2 is
the LIN master for the garage door operation
control unit J530.
The garage door operation control unit forms
part of the component protection system by
way of the master control unit J520; this must
be released.
Self-diagnosis
The control unit is provided with selfdiagnosis capability by means of address
word 4F (electronic central electrics 2).
77
Control Units
Entry and start
authorisation control unit
J518
Functions
The entry and start authorisation control unit
is the central control unit for
– Key recognition
– Evaluation of ignition/starter switch (entry
and start authorisation switch E415)
– Remote control
– Immobilizer
– Component protection
– Advanced Key functions
– Terminal 15 continued operation
Terminal control
All terminal functions relating to
–
–
–
–
–
S-contact
P-contact
Terminal 15
Terminal 75
Terminal 50
are controlled by the entry and start
authorisation control unit.
The signals "S-contact", "P-contact" and
"Terminal 15 continued operation" are only
available as CAN information.
Versions
Two versions of the entry and start
authorisation control unit
– With and without Advanced Key functions
and
– For various country-specific remote control
radio frequencies
may be fitted.
78
SSP287_050
Fitting location
The entry and start authorisation control unit
is located in the footwell beneath the driver's
seat.
SSP287_033
Diagnosis
The entry and start authorisation control unit
has diagnosis capability even when ignition is
not switched on.
CAR systems
The driver can choose
between
Car
User
Logbook
Central locking
– Simultaneous unlocking of all doors
and
– Separate unlocking of each door
in the multimedia interface.
Systems
Front passenger's door
On
Rear left door
Off
Rear right door
Off
Boot lid
Off
Auto Lock
Off
TP TMC D2 Private
Maintenance
The "immobilizer" and "component
protection" functions are described in
SSP 294 – VAS 5051 online link.
SSP287_093
79
Control Units
System layout
Driver identification
control unit J589
Entry and
start authorisation switch E415
Vehicle key
Steering column
lock control element N360
Onboard power supply
control unit J519
Door control unit,
driver side J386
Driver side aerial
for entry and start
authorisation R134
Entry and
start authorisation
control unit J518
Door control unit,
rear left J388
Interior aerial 2
for entry and start
authorisation R139
80
Interior aerial 1
for entry and start
authorisation R138
Door control unit,
front passenger side
J387
Onboard power supply
control unit 2 J520
Central locking and anti-theft
alarm system aerial R47
Door control unit,
rear right J389
Luggage compartment aerial
for entry and start authorisation R137
Convenience system
central control unit J393
Release button for
boot lid
lock cylinder F248
(soft touch)
Rear bumper aerial
for entry and
start authorisation
R136
Entry and start authorisation,
driver side rear aerial R155
Entry and start authorisation
interior aerial 3 R154
SSP287_088
81
Control Units
Block diagram
Key
D1
Inhibitor reading unit
E369 Outer door handle central locking
button, driver side
E370 Outer door handle central locking
button, front passenger side
E371 Outer door handle central locking
button, rear left door
E372 Outer door handle central locking
button, rear right door
E408 Entry and start authorisation button
E415 Entry and start authorisation switch
G415 Exterior door handle touch
sensor, driver side
G416 Exterior door handle touch
sensor, front passenger side
G417 Exterior door handle touch
sensor, rear left
G418 Exterior door handle touch
sensor, rear right
J53
J329
J386
J387
J388
J389
J518
J589
J623
J694
J695
Starter motor relay
Terminal 15 voltage supply relay
Door control unit, driver side
Door control unit, front passenger side
Door control unit, rear left
Door control unit, rear right
Entry and start authorisation
control unit
Driver identification control unit
Engine control unit
Terminal 75x voltage supply relay
Starter relay 2
N360 Steering column lock control element
N376 Ignition key withdrawal lock magnet
82
R47
Central locking and anti-theft alarm
system aerial
R134 Driver side aerial for entry and start
authorisation
R135 Front passenger side aerial for entry and
start authorisation
R136 Rear bumper aerial for entry and start
authorisation
R137 Luggage compartment aerial for entry and
start authorisation
R138 Interior aerial 1 for entry and start
authorisation, at multimedia operating
unit
R139 Interior aerial 2 for entry and start
authorisation, rear centre
R154 Entry and start authorisation interior
aerial 3, rear centre armrest
R155 Entry and start authorisation, driver
side rear aerial
R156 Entry and start authorisation, front
passenger side rear aerial
R166 Entry and start authorisation aerial,
rear right
S
Fuse
Additional signals
1
Terminal 50 (to starter B or engine
control unit J623)
2
Terminal 58s (illumination)
3
Convenience CAN High
4
Convenience CAN Low
5
Brake light switch F
6
Terminal P/N from automatic
gearbox control unit J217
(on vehicles with automatic
gearbox)
7
Parking lock auxiliary terminal
(automatic gearbox only)
8
Terminal 15 (CAN)
75x
30
15
R138
R139
R137
R136
J329
R166
R154
J694
J53
R134 G415
J623
J386
E369
J695
R155 G417
J623
J388
E371
1
R135 G416
J518
2
J387
E370
STOP
E408
START
2 1 0
R156 G418
2 1 0
J389
E372
3
4
J589
R47
D1
N360
3
6x
4
5
E415
6
8
SSP287_009
7
N376
Control Units
Entry and start authorisation switch E415
The entry and start authorisation switch acts
as ignition/starter switch.
The lock cylinder of the switch has no
mechanical encoding, i.e. it can be turned
with any key. The key is identified solely by
way of the reading unit D1 with transponder
interrogation.
OFF
ZERO
ON
START
The transponder information is transmitted in
encoded form via a 3-wire bus to the entry
and start authorisation control unit, where it
is evaluated.
The switch has three non-locking positions. In
the same manner as an ignition/starter
switch, the switch can be turned to the right
with the key to ON and START positions.
Turning to the left switches off the ignition. If
the key is not actuated, the lock returns to the
ZERO position.
SSP287_094
Mechanical
emergency
release button
The four switch positions (OFF, ZERO, ON,
START) are interrogated by way of 6 switches.
All 6 signals are evaluated by the entry and
start authorisation control unit.
Reading unit
AUS
This ensures that the system remains fully
operational should one switch fail. In the
event of a fault, a message appears on the
centre display and a fault memory entry is
set.
The switch positions can be interrogated
using the control element test.
The ignition key removal lock integrated into
the switch locks the key bit in position in the
lock. Mechanical emergency release is
provided for removing the key in an
emergency. Release involves turning the key
to the OFF position and pressing the release
button, e.g. with a ball-point pen.
84
Ignition key removal
lock
SSP287_096
Steering column lock control element N360
To lock and release the steering column, the
steering column lock control element is
actuated by the entry and start authorisation
control unit via a bidirectional bus. The
steering column lock control element is only
supplied with voltage by the entry and start
authorisation control unit when terminal 15 is
OFF. A motor is actuated by the integrated
electronics. The locking pin is moved linearly
by way of a worm drive and a swash plate.
Drive unit
(electric motor and worm drive)
The locking pin engages in the steering
mechanism at a square slider with bevelled
inner splines. The linear movement causes
the inner splines to lock the steering column.
The steering column lock is connected to the
steering column by means of shear bolts and
cannot be replaced separately.
SSP287_118
Square
slider
Entry and start authorisation button E408
(optional)
The START button is of two-stage design.
The first stage switches on the ignition.
The second stage starts the engine.
For safety reasons, use is made of a dualaction STOP button with two simultaneously
actuated NO contacts.
Pressing the STOP button switches off the
ignition if the automatic gearbox selector
lever is set to "P" or "N".
Pressing the button for more than two
seconds deactivates the S-contact. Diagnosis
for all signals is provided by way of measured
value blocks in the entry and start
authorisation control unit.
SSP287_090
85
Control Units
Central locking buttons E369 to E372
(optional)
A button for locking the central locking
system is fitted in each door handle.
The central locking system can only be locked
if a key is recognised by an external aerial on
the same side of the vehicle as the key.
Exterior door handle touch
sensors G415 to G418 (optional)
The capacitive sensors are integrated into the
outer door handle and are actuated with DC
voltage. The entry and start authorisation
control unit evaluates the sensor current.
One capacitor plate each is integrated into the
handle and mount.
The finger recess acts as a dielectric. Insertion
of a medium between the capacitor plates
alters the capacitance and results in a brief
flow of current. This current is detected and
evaluated by the entry and start authorisation
control unit.
SSP287_095
Entry and start authorisation aerials R134,
R135, R138, R155, R156 (optional)
SSP287_097
A ferrite aerial is integrated into each outer
door handle for the transmission of signals by
the entry and start authorisation control unit
to the vehicle key. A further ferrite aerial is
located at the multimedia operating unit
E380.
Entry and start authorisation aerials R136,
R137, R139, R154, R166 (optional)
SSP287_091
Air-core coil aerials for key recognition are
fitted at the rear of the passenger
compartment, in the luggage compartment
beneath the rear shelf and in the rear bumper.
SSP287_092
86
Detection ranges for vehicle key with
Advanced Key
Remote control operation of
central locking system
Convenience locking
range: 6 m
Remote control: > 15 m
Key detection range
for luggage compartment
Key detection range
for central locking
in door area
(approx. 1.50 m)
Key detection
range for rear
access
(approx. 1.50 m)
SSP287_089
Key detection range – entire passenger compartment
Key functions with Advanced Key
If a vehicle key is in the central locking
detection range, the vehicle can be unlocked
by reaching beneath a handle or locked by
pressing a central locking button in the outer
door handle. If there are other keys in the
passenger compartment when locking, these
can no longer be used for starting.
If there is a vehicle key in the passenger
compartment, the ignition can be switched
on/the engine started by way of the entry and
start authorisation button E408. At the same
time, the automatic gearbox selector lever
must be set to "P" or "N" and the brake pedal
pressed.
Depending on the settings made in the
"Central locking" menu in the MMI, either the
entire vehicle can be unlocked or just certain
doors (refer to Page 79).
Unlocking one door always unlocks the
driver's door as well.
To stop the engine, the gearbox selector lever
must be set to "P" or "N". Keeping the STOP
button pressed or opening the driver's door
deactivates the S-contact and the
electromechanical steering column lock is
engaged.
If there is a vehicle key in the luggage
compartment detection range, the luggage
compartment is opened again after it has
been locked.
If no key is detected in the passenger
compartment with "Advanced Key ON", a
message appears in the centre display as
soon as
–
–
–
–
A window is opened or
The sunroof is opened or
A door is opened or
After accelerating from low speed to in
excess of 15 km/h
87
Control Units
Driver identification
control unit J589
(one touch memory)
The control unit implements a convenience
system which assists the driver in making
individual settings for various vehicle systems.
It permits the storage of individual settings for
four different users in the vehicle.
The control unit is located in the centre
console next to the gearstick/selector lever.
Design
SSP287_031
The entry and start authorisation button E408
and driver identification control unit form one
physical unit.
The button features an integrated sensor foil
with electrical connections which can detect
finger contact.
Operation
On pressing the entry and start authorisation
button, the fingerprint is read in via the sensor
foil.
Following successful identification of a
matched user, a user ID is transmitted to the
convenience CAN by the driver identification
control unit if terminal S is active.
The user ID is recognised by all control units
involved in memory control.
The personalised settings stored are then
activated and implemented.
88
SSP287_011
Restriction of functions
The following operating statuses result in
the restriction of functions:
The user ID is read in by the following
components:
–
–
–
–
–
–
–
–
Undervoltage < 9 V
Overvoltage > 15 V
CAN bus fault
Component protection active
Possible fault messages in the dash panel
insert display and in the front information
and display unit (MMI):
– "User not identified"
Remedy: Finger must be applied again
Sunroof electronics control unit J528
Parking aid control unit J446
Data bus diagnostic interface J533
Convenience system central control unit
J393
– Climatronic control unit J255
– Seat adjustment and steering column
adjustment with memory control unit
J136
– Door control unit, driver side J386
– "Sensor contaminated"
Remedy: Clean sensor with a clean
lint-free cloth
Block diagram
E408 Entry and start authorisation button
J518
J518 Entry and start authorisation
control unit
J589 Driver identification control unit
58s
E408
J589
Convenience CAN High
Convenience CAN Low
SSP287_008
89
Control Units
Fingerprint recognition
The fingerprint recognition function
compares a print to the fingerprints stored in
the driver identification control unit.
The front narrow side of the START button
forms a stop to prevent excessive deviation in
longitudinal direction.
The system is based on the fact that every
person has a different fingerprint with
particular characteristic features (minutiae)
regardless of whether the prints are from the
same finger.
Due to the combination with the START
button, there is a possibility of nonrecognition if excessive force (> 12 N) is
exerted with wet hands. For this reason, in
the case of a second attempt following nonrecognition, the system switches to a trigger
mode which constantly reads in images and
does not evaluate an image until adequate
quality has been achieved.
For comparison of two fingerprints, at least
80 % of the area being compared must
coincide.
To ensure accurate results, the shape of the
START button was designed such that the
user's finger is always applied in virtually the
same position.
There are very few people who are not
suitable for matching to the system because
the fingerprint sensor is not able to recognise
any usable images.
Possible examples include very dry and
chafed hands or skin disease.
Such people cannot make use of the driver
identification system.
Recognition stages:
1 Recording of fingerprint by capacitive
sensor
SSP287_103
2 Generation of a grey step image
SSP287_104
90
3 Processing of sensor data in control
unit (image processing)
SSP287_105
4 Characteristic feature filtering
The fingerprint contains information in
the form of ridges, branches, whorls and
loops.
5 Recognition of characteristic areas
(minutiae)
9 Following definite identification of the
image of the finger concerned, the user ID
is transmitted by the driver identification
control unit on the convenience CAN.
SSP287_107
6 Interlinking of minutiae by way of a
complex grid
SSP287_110
Following successful identification, the name
is marked in the MMI user menu under CAR/
user.
The control units concerned set the values
stored for the corresponding user ID.
SSP287_108
7 Storage of angle, spacing and number
of finger ridges between minutiae as well
as type of minutiae
In the event of non-recognition, the driver is
informed by way of a fault message in the
dash panel insert display:
"User not identified"
?
SSP287_109
8 Comparison of characteristic feature list to
archive (matched finger)
SSP287_107
91
Control Units
Matching
Car
User
Logbook
Finger selection
Right index finger
Systems
TP TMC
Maintenance
SSP287_101
New user matching is implemented by way of
the "CAR" menu in the multimedia interface
(MMI) and can be performed for four users.
A maximum of 5 fingers can be matched per
user.
The MMI provides user prompting for the
matching process to ensure optimum image
quality.
Finger matching is performed by placing it on
the sensor three times in succession with
moderate pressure (< 12 N). The first time, the
finger should be placed in normal centre
position, then approx. 2 mm to the left and
finally 2 mm to the right.
92
Further prints may be necessary depending
on image quality. If this is the case, the user
will be informed by way of an appropriate
prompt in the MMI.
Three finger images must be read in and
stored before a person can be identified.
At least one finger must be matched.
To rule out identification problems, it is
however appropriate to match two or several
fingers.
Diagnosis
Address word1D - driver identification
The faults entered can be processed by way
of the assisted fault-finding.
Fault entries can occur:
– If supply voltage is exceeded or undershot
– If communication with
- Entry and start authorisation control
unit J518
- Data bus diagnostic interface J533
- Energy management control unit J644
- Door control unit, driver side J386
A user ID can be output on the convenience
CAN to check user identification.
This only involves implementation of the
convenience settings; access to customer
personal data (email, etc.) is not possible.
is interrupted
– In the event of incorrect component
protection basic setting/adaption
Adaption
Channel 1 – Erasing of individual user
by selection of corresponding
user ID
Channel 2 – Erasing of all users
Measured value block
All input signals can be displayed.
93
Notes
94
95
287
All rights reserved. Subject to
technical modification.
Copyright* 2002 AUDI AG, Ingolstadt
Department I/VK-35
D-85045 Ingolstadt
Fax 0841/89-36367
000.2811.07.20
Technical status as at 09/02
Printed in Germany
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