Audi A5 SPORTBACK Manual

Audi A5 - Networking
Self-Study Programme 395
Service Training

Innovations in the electrical system and electronics on the Audi A5
The number of control units in motor vehicles con-
tinues to increase, and the Audi A5 is no exception.
Many functions would not be possible without this
multiplicity of control units. Ongoing advance pro-
fessional training is needed in order to abreast with
the rapid rate of development within this sector.
This self-study programme gives you the opportu-
nity to familiarise yourself with the networking
topology of the control units on the Audi A5. In addi-
tion, you will learn about the installation locations
of the various control units.
395_029
Familiar components such as the data bus diagnos-
tic interface, the alternator, the onboard power sup-
ply control unit and the light switcheshave now
been updated. This self-study programme contains
information about the new aspects of these compo-
nents, as well as service-related information about
the outside lights on the new Audi A5.
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NoteReference
The self-study programme teaches the design and function of new vehicle models,
new automotive parts or new technologies.
The self-study programme is not a repair manual!
All values given are intended as a guideline only and refer to the software version valid at the time of
preparation of the SSP.
For maintenance and repair work, always refer to the current technical literature.
Contents
Control units
Fuses and relays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Installation locations of Infotainment components . . . . . . . . . . . . . . . . . . . . . . . . 6
Installation locations of control units on the powertrain
CAN bus and extended CAN bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Installation locations of control units on the dash panel insert / suspension
CAN bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Installation locations of control units on the convenience CAN bus . . . . . . . . 12
Networking / vehicles with infotainment CAN bus . . . . . . . . . . . . . . . . . . . . . . . . 14
Networking / vehicles with MOST bus. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
CAN node connectors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Overview
Data bus diagnostic interface J533 (gateway). . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Battery monitor control unit J367 (battery data module) . . . . . . . . . . . . . . . . . . 23
Alternator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Battery / external starter connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Onboard power supply control unit J519. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Light switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Wiper motor control unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Outside lights, front. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Outside lights, rear . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

4
Fuses and relays
Overview
Fuse panel in dash panel on right
and CAN node connectors
Fuse panel and external starter connec-
tion in plenum chamber
Relay carrier and fuse panel in
electronics box
Connector station and
CAN node connector on left A-post
Relay carrier and fuse panel in
luggage compartment on right

5
395_015
Relay carrier and mounting bracket for onboard
power supply control unit in driver-side footwell
Fuse panel and battery disconnecting
element at battery positive pole
Fuse panel in dash panel on left

6
Overview
Installation locations of Infotainment components
Information control unit,
front (MOST)
CD changer (MOST)
Connection for external
audio sources R199 (MOST)
Telephone transmitter and receiver unit
Radio (CAN)

7
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Radio (MOST)
Amplifier
(not with chorus)
Navigation
(MOST)
Digital satellite radio (USA)
TV tuner
DAB tuner
(MOST)

8
Overview
Installation locations of control units on the powertrain CAN bus
and extended CAN bus
Data bus
diagnostic interface
Adaptive cruise
control unit
Headlight range control,
control unit
Airbag control unit
Automatic gearbox
control unit
Engine control unit
Control units on the powertrain CAN bus
Control units on the extended CAN bus

9
395_002
ECD control unit (electroni-
cally controlled damping)
Lane change assistant
control unit (master)
Lane change assistant
control unit (slave)

10
Overview
Installation locations of control units on the dash panel insert /
suspension CAN bus
Data bus diag-
nostic interface
Steering angle sensor
Auxiliary heater control unit
Dash panel insert
control unit
ABS/ESP
control unit
Control units on the dash panel insert/suspension CAN bus

11
395_003
Park assist
control unit
Parking brake and hand-
brake control unit

12
Overview
Installation locations of control units on the convenience CAN bus
Data bus diagnostic
interface
Tyre p re s s u re m o n i t o r -
ing system control unit
(USA only)
Seat control units
Onboard power supply
control unit
Climatronic
control unit
Steering column electronics
control unit
Door control unit
Door control unit
Control units on the convenience CAN bus

13
395_004
Trailer detector
control unit Rear-view camera system
control unit
Convenience system
central control unit
Control unit for
special vehicles

14
Overview
Networking / vehicles with infotainment CAN bus
Air quality sensor
G238
Refrigerant pres-
sure/temperature
sender G395
Garage door opera-
tion control unit
J530
Light switch
E1
Wiper motor con-
trol unit
J400
Rain and light
detector sensor
G397
Electrical steering
column lock con-
trol unit
J764
Entry and start
authorisation
switch
E415
Garage door operat-
ing unit
E284
Sliding sunroof con-
trol unit
J245
Anti-theft alarm
system sensor
G578
Humidity sender
G355
Onboard power supply
control unit
J519
Convenience system central
control unit
J393
Alarm horn
H12
Climatronic control unit
J255
Fresh air blower
control unit
J126
Control motors for
flap control
Trailer detector
control unit
J345
Steering column
electronics con-
trol unit
J527
Rear-view camera
system
J772
Multi-function
steering wheel
control unit
J453
Seat and steering col-
umn adjustment con-
trol unit with memory
function J136
Seat adjustment
control unit with
memory, front pas-
senger J521
Driver door con-
trol unit
J386
Front passenger
door control unit
J387
Power output
module for left
headlight
J667
Power output
module for right
headlight
J668

15
Diagnostic port
Control unit with
display in dash
panel insert J285
Yaw rate s ender
G202
Park assist
control unit
J791
ABS control unit
J104
Steering angle
sender G85
Electric park and
handbrake control
unit
J540
Additional heater
control unit
J364
Radio
R
Digital sound
package control
unit
J525
Telephon e t rans -
mitter and
receiver unit
R36
Data bus diagnostic interface J533
Battery monitor
control unit
J367
3-phase AC
alternator
C
Adaptive cruise
control unit
J428
Lane change
assistant control
unit
J769
Lane change
assistant control
unit -2-
J769
Airbag control unit
J234
Engine control
unit J623
Automatic gear-
box control unit
J217
ECD control unit
(electronically
controlled damp-
ing) J250
Headlight range
control, control
unit
J431
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Powertrain CAN bus
Convenience CAN bus
Dash panel insert/suspension CAN bus
Extended CAN bus
Infotainment CAN bus
Diagnostics CAN bus
LIN bus
Subbus systems

16
Overview
Networking / vehicles with MOST bus
Air quality sensor
G238
Refrigerant pres-
sure/temperature
sender
G395
Garage door opera-
tion control unit
J530
Light switch
E1
Wiper motor con-
trol unit
J400
Rain and light
detector sensor
G397
Electrical steering
column lock control
unit
J764
Entry and start
authorisation
switch E415
Garage door oper-
ating unit
E284
Sliding sunroof
control unit
J245
Anti-theft alarm
system sensor
G578
Humidity sender
G355
Onboard power supply
control unit
J519
Convenience system central
control unit
J393
Alarm horn
H12
Climatronic control unit
J255
Fresh air blower
control unit J126
Control motors for
flap control
Trai ler d etecto r
control unit
J345
Steering column
electronics con-
trol unit
J527
Rear-view camera
system
J772
Multi-function
steering wheel
control unit
J453
Seat and steering
column adjustment
control unit with
memory function
J136
Seat adjustment
control unit with
memory, front
passenger J521
Driver door con-
trol unit
J386
Front passenger
door control unit
J387
Power output
module for left
headlight
J667
Power output
module for right
headlight
J668
Airbag control
unit J234
Engine control
unit J623
Automatic gear-
box control unit
J217
ECD control unit
(electronically
controlled damp-
ing) J250
Headlight range
control, control
unit
J431

17
Front information
control unit
J523
Telephone trans-
mitter and
receiver unit
R36
Operating elec-
tronics control
unit, navigation
J401
TV tuner
R78
CD changer
R41
Connection for
external audio
sources
R199
Digital radio
R147
Digital sound
package control
unit
J525
Voice input con-
trol unit
J507
Radio
R
Data bus diagnostic interface J533
Battery monitor
control unit
J367
3-phase AC
alternator
C
Adaptive cruise
control unit
J428
Lane change
assistant control
unit
J769
Lane change
assistant control
unit -2-
J769
Diagnostic port
Control unit with
display in dash
panel insert
J285
Yaw rate s ende r
G202
Park assist
control unit
J791
ABS control unit
J104
Steering angle
sender G85
Electric park and
handbrake control
unit
J540
Additional heater
control unit J364
395_028
Powertrain CAN bus
Convenience CAN bus
Dash panel insert/suspension CAN bus
Extended CAN bus
Diagnostics CAN bus
LIN bus
Subbus systems
Most bus

18
Overview
CAN node connectors
Installation location
The CAN node connectors are located on the relay carrier on the left and on the fuse holder in the dash panel
on the right.
395_007
Relay carrier, left
395_008
Fuse holder in dash panel on right
Assignments
The infotainment CAN bus, the convenience CAN
bus and the dash panel insert / suspension CAN bus
control units are connected to both CAN node con-
nectors. The familiar CAN isolating adaptor V.A.G
1598/38 can be used for fault-finding. In this way, it
is possible to access the data lines of the control
units without removing trim parts or opening the
wiring harness.
This reduces fault-finding time.
The powertrain CAN and extended CAN bus systems
are not connected to the node connectors. They are
connected to the wiring harness by crimp connec-
tors.
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Infotainment CAN bus
Convenience CAN bus
Dash panel insert/suspension CAN bus

19
Diagnostics
To perform diagnostics on the Audi A5, the VAS test-
ers require the basic CD 11.XX and the relevant
branded CD by Audi.
This is because the data protocol (language) which
several control units and the VAS tester use to inter-
change data has changed.
The tester must therefore be capable of processing
both the "old" data protocol, Key Word 2000, and the
"new" data protocol, UDS with ASAM/ODX.
The change of data protocol does not affect service
personnel.
The Guided Fault Finding and Guided Functions pro-
grams can be used as before.
Again, data is exchanged between the vehicle and
the tester via the diagnostics CAN bus.
The voltage level and the transmission speed on
this CAN data bus have not changed.
For the first time, it is only possible to encode the
control units on the Audi A5 with a tester connected
online.
Encoding can no longer be performed without an
active online connection.
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395_026
UDS
Unified Diagnostic Services Protocol
ODX
Open Diagnostic Date Exchange
ASAM
Association for Standardization of Automation and Measurement Systems
ASAM has been a registered German association since 1998.

20
Control units
J533 Data bus diagnostic interface (gateway)
Introduction
The new Audi A5 has an independent data bus diagnostic interface J533. The diagnostic interface represents
the link between the various CAN bus systems. Depending on specification, the vehicle has between 4 and 6
different onboard CAN bus systems:
• Diagnostics CAN bus - all Audi A5 models have one
• Powertrain CAN bus - all Audi A5 models have one
• Dash panel insert/suspension CAN - all Audi A5 models have one
• Convenience CAN bus - all Audi A5 models have one
• Infotainment CAN bus - an Audi A5 has either an infotainment CAN bus or the MOST
optical bus system (depending on specification)
• Extended CAN bus - if the vehicle has one of the following optional extras:
-ACC
- lane change assist
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Data bus
diagnostic interface
J533
Term i n a l 1 5 Term i n a l 3 0
5A
Convenience CAN bus
Powertrain CAN bus
Dash panel insert/
suspension CAN bus
5A
LIN bus
Diagnostics CAN bus
Extended CAN bus
Infotainment CAN bus
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