Audi Q7 364 User Manual
Service Training
Audi Q7 - Electrical System
Self-Study Programme 364
The Audi Q7 stands for 100% premium-quality electronics!
There has been an enormous increase of the number of electronic control units over the past few years.
The majority of innovations made are only possible thanks to increasingly sophisticated electronics. Without
this development, many of the in-car comfort features which today are taken for granted would not be viable.
To keep pace with the increasing complexity of new vehicles, continuous learning is essential. The Self-Study
Programmes by AUDI are an efficient advanced learning tool as they enable you keep abreast of technical
developments.
To be able to offer customers with this diversity of
functions and equipment options, a multiplicity of
different electronic control units are required in the
Audi Q7. The control units do not work separately as
independent nodes, rather they are interconnected
via efficient bus systems. Depending on the
quantity of data to be exchanged, the MOST bus, an
optical data bus, a CAN bus or a LIN bus is utilised.
Data is also exchanged across the various bus
systems. A separate control unit provides the
interface between the various systems. Each control
unit is therefore supplied efficiently with the
information and vehicle operating variables which
its requires for optimal functioning.
Self-Study Programme 364 introduces you to the
network topology of the Audi Q7, and provides you
with an overview of the positions in the vehicle in
which electrical components are located. In addition
to obtaining service-related information on the
control units, you will learn the installation location
of each control unit and become familiar with its
tasks. You quickly and efficiently gain an insight into
the electronics in the Audi Q7.
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Into the lead: With design & performance
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Contents
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Fuses and relays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Installation overview - control units. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Networking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Control units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Data bus diagnostic interface J533 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Control unit with display in dash panel insert J285 . . . . . . . . . . . . . . . . . . . . . . . 11
Onboard power supply control unit J519 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Battery and energy management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Alternator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Front exterior light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Rear exterior light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Onboard power supply control unit 2 J520 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Entry and start authorisation control unit J518. . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Door control units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Seat adjustment control units on driver and front passenger sides
J136 and J521 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Convenience system central control unit J393 . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Convenience system central control unit 2 J773 . . . . . . . . . . . . . . . . . . . . . . . . . 45
open sky system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Trailer detector control unit J345 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Rear lid control unit J605 and
rear lid control unit 2 J756. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
This self-study programme teaches the design and function of new vehicle models,
new automotive components or new technologies.
The self-study programme is not a workshop manual!
All values given are intended as a guideline only, and refer
to the software variant valid at the time of publication of the SSP.
Please refer to the relevant Service Literature for current inspection, adjustment and repair instructions.
NoteReference
Overview
Fuses and relays
The fuse and electrics boxes
Fuse and relay carriers can be found in the following
locations in the new Audi Q7:
– Dash panel, left and right adjacent the A-post
– Engine compartment, rear left
– Onboard power supply control unit
– Electronics box under the left seat
– Luggage compartment, right
For details of fuse and relay assignments, please
refer to the current service literature.
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4
5
Overview
Installation overview - control units
Legend
1 Garage door operation control unit J530
2 Adaptive cruise control unit J428
3 Data bus diagnostic interface J533
4 Onboard power supply control unit J519
5 Headlight range control, control unit J431
6 Tyre pressure monitor control unit J502
7 Entry and start authorisation control unit J518
8 Steering column electronics control unit J527
9 Driver door control unit J386
10 Rear left door control unit J388
11 Front passenger door control unit J387
12 Rear right door control unit J389
13 Energy management control unit J644
14 Airbag control unit J234
15 Onboard power supply control unit 2 J520
16 Seat adjustment control unit with memory, front passenger J521
17 Battery A
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6
Legend
20 Tailgate control unit J605
21 Tailgate control unit 2 J756
22 Reversing camera system control unit J772
23 Convenience system central control unit 2 J773
24 Convenience system central control unit J393
25 Additional heater control unit J364
26 Aerial reader unit for entry authorisation for keyless entry system J723
27 Parking aid control unit J446
28 Trailer detector control unit J345
29 Adaptive suspension control unit J197
30 Lane Change Assist control unit J769
31 Lane Change Assist control unit 2 J770
32 Reversing camera R189
33 Radio controlled clock receiver J489
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7
Overview
Networking
Lane Change Assist
control unit 2
J770
Yaw r ate sen d e r
G202
Seat occupied
recognition
control unit
J706
Powe r outp ut
module for left
headlight
J667
Powe r outp ut
module for right
headlight
J668
Control unit with
display in dash panel
insert
J285
Engine
control unit
J623
Engine
control unit 2
J624
ABS
J104
Airbag
control unit
J234
Automatic gearbox
control unit
J217
Headlight range
control, control
unit - J431
Adaptive
suspension
control unit
J197
Park ing a id
control unit
J446
Driver door
control unit
J386
Front passenger
door control unit
J387
Rear left door
control unit
J388
Rear right door
control unit
J389
Seat and steering
column
adjustment
control unit with
memory
J136
Seat adjustment
control unit with
memory, front
passenger - J521
Lane Change Assist
control unit
J769
Adaptive cruise
control unit
J428
Data bus diagnostic
interface
J533
Energy
management
control unit
J644
Additional heater
control unit
J364
Tailgate
control unit
J605
Onboard power
supply control unit
J519
Onboard power
supply control
unit 2 - J520
Entry and start
authorisation
control unit - J518
Comfort system
central control
unit 2 - J773
Trailer detector
control unit
Steering angle
sender
G85
Steering column
electronics control
unit - J527
Multi-function
steering wheel
control unit - J453
8
J345
Reversing camera
system
J772
Convenience
system central
control unit
J393
Tyre pressu re
monitor control
unit - J502
Climatronic
control unit
J255
Rear Climatronic
operating and
display unit
E265
Front information
control unit
J523
Mobile telephone
operating
electronics control
unit - J412
Te le p ho n e
transmitter and
receiver unit
R36
Navigation system
with CD drive
control unit - J401
TV tuner
R78
Te le p ho n e
handset
R37
Radio
R
Digital
sound package
control unit - J525
Ta il g at e
control unit 2
J756
Wiper motor
control unit
J400
Sliding sunroof
control unit
J245
Entry and start
authorisation switch
E415
Interior
monitoring sensor
G273
Voice input
control unit
J507
Rain and light
detector sensor
G397
Sunroof roller blind
control unit
J394
Alarm horn
H12
Mediaplayer in
Digital radio
R147
Rear sliding
sunroof
control unit
J392
Aerial reader unit for entry
authorisation for keyless entry
system - J723
Position 1
R118
MOST bus
Dash panel insert CAN
bus
Diagnostics CAN bus
Power train CAN bus
Convenience CAN bus
CAN Extended
LIN bus
Various subbus systems
Sender unit,
front left
G431
Sender unit,
front right
G432
Sender unit,
rear l eft
G433
Sender unit,
rear right
G434
Rear tyre pressure
monitor aerial
R96
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9
Control units
Data bus diagnostic interface J533
Modifications to Audi A6 ‘05
The data bus diagnostic interface of the Audi Q7 now has more powerful hardware and a new processor.
This was necessary due to the increasing number of messages which are required to be routed between the
various bus systems. No functional modifications were made to the diagnostic interface of the Audi A6 ’05.
The diagnostic interface with new hardware is also be introduced in the Audi A8 ’03 and A6 ’05 at a later date.
Master functions
● Terminal 15 - powertrain CAN bus run-on
● Sleep and wake-up of the data bus systems
● Optical fibre break diagnostics of the MOST-Bus
● Installation list
Variants
The data bus diagnostic interface is available in two
variants for the Audi Q7. The part numbers differ
from one another only in respect of the index. The
difference between the two variants is the
availability of a CAN Extended connection. This
connection is required if ACC or Lane Change Assist
is installed in the vehicle.
Installation location
The data bus diagnostic interface J533 is located on
the left behind the dash panel insert and is attached
to a mounting bracket.
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10
Control unit with display in dash panel insert J285
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Modifications to Audi A6 ‘05
The control unit with display in dash panel insert J285 is already known from the Audi A6 ’05. It was adapted
functionally to the new features of the Audi Q7.
Unlike the Audi A6 ’05, the Audi Q7 does not have an electro-mechanical parking brake; it is equipped with
a foot-operated mechanical handbrake. A switch, which is read by the control unit with display in dash panel
insert J285, is attached to the operating lever. When the switch is actuated, earth is connected and the
corresponding warning lamp is activated in the dash panel insert.
A new feature in the dash panel insert is the air spring suspension level indicator. This indicator is activated in
the centre display as soon as an automatic level change is performed. This is the case, for example, if the
system exits "lift" mode because a speed threshold has been exceeded; the suspension height will then be
lowered.
The level indicator can, however, be activated continuously by the driver by clicking the onboard computer to
the corresponding level with the Reset key.
A further new feature was implemented in the onboard computer. The driver has the option of displaying the
vehicle's current speed digitally. This is done by setting the onboard computer setting the onboard computer
to the corresponding level with the Reset key. On this level, the onboard computer variables can still be
retrieved in the case of a colour dash panel insert. The two diagrams show the vehicle speed display in
a colour dash panel insert and in a monochrome dash panel insert.
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364_011
11
Control units
Inputs
– Oil pressure switch
– Oil temperature and oil level sensor
– Radio controlled clock signal
– Brake pad/lining wear indicator wire
– Fuel tank sender 1 and fuel tank sender 2
– Washer fluid shortage indicator switch
– Brake fluid shortage indicator switch
– Handbrake applied recognition switch
– Ambient temperature sensor
–Auto Check button
–Terminal 30
–Terminal 31
Inputs and outputs
– CAN bus lines of the dash panel insert CAN
– Wake-up line between diagnostic interface and
dash panel insert for mutual wake-up at
"terminal 15 OFF"
Outputs
– Radio controlled clock voltage supply
– Terminal 58d (display illumination)
– Terminal 58s (switch illumination)
Variants
The Audi Q7 comes with three different dash panel
insert variants. A monochrome dash panel insert is
standard equipment, but a dash panel insert with
colour display is also available. In the case of the
dash panel insert with colour display, a distinction
must be made between vehicle with or without ACC
function.
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12
Onboard power supply control unit J519
The onboard power supply control unit J519 known
from the Audi A6 ‘05 and A8 ‘03 is employed in the
Audi Q7.
Various additional functions were implemented for
use in the Audi Q7.
Installation location
The onboard power supply control unit J519 is
installed in the cockpit at the front left on the
control unit holder adjacent the steering column.
Variants
Compared to the new Audi A6 ‘05, only the Midline
and Highline variants are installed in the Audi Q7.
This is necessary because a rear window wiper is
always installed in the Audi Q7. In the Midline
variant or higher, the onboard power supply control
unit drives the windscreen and rear window washer
pump V59. The Highline variant is required in
combination with the electrical steering column
adjustment.
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Reference
For further information about the
onboard power supply control unit,
please refer to Self-Study Programmes
SSP 287, SSP 288 and SSP 326.
13
Control units
Master functions
–Exterior light control
– Coming home / leaving home
– LIN master for J400 - wiper motor control unit
– LIN master for G397 - rain and light detector sensor
Substitute master function
In case of failure of the convenience system central control unit J393, the onboard power supply control unit
J519 acts as the substitute master. It sends flash information via the CAN bus.
Other functions
– Voltage-encoded read-in of the rotary light switch
– Activation of the side lights warning lamp in the rotary light switch
– Electrical steering column adjustment
– Activation of the driver and front passenger footlights. The type of lighting, LED or conventional bulb can
be encoded in the onboard power supply control unit.
– Activation of the shift gate lighting
– Activation of the daytime driving lights
– Activation of the front and side turn signals
– Activation of the signal horn
– Activation of the windscreen and rear window washer pump V59
– Activation of the headlight washer system
– Activation of the rear window wiper motor V12
– Steering column adjustment memory
– Easy entry steering column adjustment
Emergency functions
If a fault is found in the rotary light switch or an open circuit in the wire to the rotary light switch, the onboard
power supply control unit automatically activates the light continuously.
If a fault has occurred in the light control, the light is activated continuously by the onboard power supply
control unit J519.
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Battery and energy management
The energy management control unit J644 is
identical to the control unit already known from the
A6 ´05 and A8 ´03.
Installation location
The energy management control unit J644 is
installed below the left-hand seat adjacent the
battery case.
Energy management control unit
J644
Reference
For further information about the
energy management system, please
refer to Self-Study Programmes SSP
287 and SSP 326.
BatterySeat frame
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Express static current measurement
A so-called express static current measurement can be made in the Guided Fault Finding mode or the Guided
Functions mode under "61 - Battery control - Static current measurement using J644 - energy management
control unit" . The energy management system measures the actual static current in approx. 15 minutes. If the
static current is too high, a faultfinding program can be started directly from this program.
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Control units
Evaluating history data
The history data contains recorded information
about the onboard power supply.
Reference
For further information, please refer to
Self-Study Programme SSP 326.
Data records
The data can be read out in Guided Fault Finding
mode or the Guided Functions mode under
"61 - Battery control".
The following data records are available:
– Static voltage history
– Static current history
– Critical energy balance
– Power-down level history
– Battery change history
– Energy balance of the previous 5 trips
– Energy balance of the previous 5 standstill
periods
– Date/clock time programming in the dash panel
insert
Guided Fault Finding
Function/component selection
Select function or component
Electrical system (Rep. Gr. 01; 90 - 97)
01 - Systems with self-diagnostic capability
61 - Battery control
J644 - Energy management control unit, functions
A - Battery, state of charge
A - Battery, battery test
J644 - Energy management, general description
J644 - Energy management control unit, encoding
J644 - Read history data
J644 - Energy management, read data blocks
J644 - Energy management, interrogate fault memory
J644 - Final control tests, alternator voltage
J644 - Replace control unit
J644 - Energy manager, activate/deactivate Transport mode
AUDI
Audi A6 2005>
2005 (5)
Saloon
BBJ 3.0l Motronic / 160 kW
326_123
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Structure of the data records
Static voltage history
In the static voltage history, it is possible to read out the following battery voltages:
● 12.5 V
● 12.2 V
● 11.5 V
The previous 4 entries, or "time stamps", are displayed.
Display on tester
Static voltage < 12.5 V : 46 hours
Static voltage < 12.2 V : 18 hours
Static voltage < 11.5 V : 9 hours
Static voltage history (raw data) =
2005-06-28, 10:12:00 * 0005 * 001 **
2005-06-14, 12:45:00 * 0001 * 001 **
2005-05-24, 10:26:00 * 0004 * 001 **
2005-05-17, 11:08:00 * 0002 * 001 * 00046 ***
2005-06-24, 11:12:00 * 0004 * 001 **
2005-05-16, 10:36:00 * 0002 * 001 **
2005-04-20, 12:56:00 * 0003 * 001 **
2005-04-12. 16:03:00 * 0002 * 001 * 00018 ***
2005-06-28, 10:12:00 * 0002 * 001 **
2005-06-17, 18:49:00 * 0003 * 001 **
2005-05-20, 11:16:00 * 0001 * 001 **
2005-04-22, 13:18:00 * 0001 * 001 * 00009 ***
Display of the complete voltage undershoot for each voltage threshold
Previous four values for static voltage < 12.5 V
The most recent value is listed first
The previous four values for static voltage < 12.2 V
The most recent value is listed first
Previous four values for static voltage < 11.5 V
The most recent value is listed first
Structure of the data record
2005-06-28 , 10:12:00 * 005 * 001 * 0012 **
2005-06-28 Date: year, month, day Time s tam p
10:12:00 Time: hours, minutes, seconds
005 Time in hours which the actual voltage is below the set voltage, e.g. 12.5 V
001 Battery number
0012 Total time in hours which the actual voltage is below the set value. Only specified for fourth value.
The total may be larger than the total of the previous 4 entries, because all deviations below the voltage
threshold are counted for the battery which is fitted.
Prolonged deviations below 12.2 V and 11.5 V are particularly critical.
If the battery voltage is below these threshold values, the battery will not be able to regenerate. This can result
in damage to the battery after a lengthy standstill period.
If lengthy deviations below 12.2 V and 11.5 V are ascertained, the battery must be tested.
The data are recorded under the following test conditions :
– Terminal 15 OFF for at least 2 hours
– Convenience CAN bus in Sleep mode
– Power consumption less than 100 mA
17
Control units
Static current history
The previous 10 entries can be read out in the static current history.
Display on tester
An excessively high static current was measured for a total period of 136 hours.
Static current history =
2005-06-27, 11:14:00 * 0001 hours 00.60 A, static current
2005-06-20, 13:36:00 * 0001 hours 00.70 A, static current
2005-06-18, 19:19:00 * 0004 hours 01.00 A, static current
2005-06-10, 14:12:00 * 0002 hours 00.60 A, static current
2005-05-30, 11:47:00 * 0003 hours 00.70 A, static current
2005-05-29, 12:03:00 * 0002 hours 01.20 A, static current
2005-05-21, 10:59:00 * 0005 hours 00.80 A, static current
2005-05-14, 16:52:00 * 0001 hours 01.00 A, static current
2005-04-20, 11:28:00 * 0004 hours 00.60 A, static current
2005-04-18, 10:07:00 * 0002 hours 00.70 A, static current
An excessively high static current was measured for a total period of 136 hours.
Total duration with excessively high static current. The total may be larger than the total of the previous
10 entries, because all are counted for the battery which is fitted. This entry is not required for the analysis.
The evaluation of the previous 10 entries is important.
The previous 10 entries are displayed.
2005-06-27 , 11:14:00 * 00 hours 00, 60 A, static current
2005-06-27 Date: year, month, day Time stamp
11:14:00 Time: hours, minutes, seconds
00 hours Time in hours which the actual voltage is below the set voltage, e.g.
00, 60 A, static current Battery number
12.5 V
The evaluation of prolonged deviations above the static current is important. If 0 or 1 is displayed for the
duration the deviation above the set value, this means that the duration of the deviation above the set value
was less than or equal to one hour. Such entries can be disregarded because they are caused, among other
things, by the "TP memory function". If the value 0 is displayed for the static current, these are short current
peaks which can be disregarded.
High static currents can be caused by:
– the customer - if electrical consumers such as power supplies or vehicle fridges are connected to the
cigarette lighter supplied via terminal 30.
– the vehicle - in the event of a fault.
If the vehicle is required to have a high static current due to an awake bus system, no entry is made in the
history data under "Static current history" due to non-compliance with the test conditions (convenience CAN
bus must be in Sleep mode).
Test conditions are:
– Terminal 15 OFF for at least 2 hours
– Convenience CAN bus in Sleep mode
– Power consumption greater than 50 mA
The 50 mA current threshold consists of the following components:
– 25 mA max. permissible static current
– 25 mA for possible charging of the anti-theft alarm sounder
When a test is made using express static current measurement, 70 mA is output as the maximum permissible
static current. The difference can be attributed to an additional tolerance of 20 mA.
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