Page 1
Service Training
Audi A5 - Networking
Self-Study Programme 395
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Innovations in the electrical system and electronics on the Audi A5
The number of control units in motor vehicles continues to increase, and the Audi A5 is no exception.
Many functions would not be possible without this
multiplicity of control units. Ongoing advance professional training is needed in order to abreast with
the rapid rate of development within this sector.
This self-study programme gives you the opportunity to familiarise yourself with the networking
topology of the control units on the Audi A5. In addition, you will learn about the installation locations
of the various control units.
395_029
Familiar components such as the data bus diagnostic interface, the alternator, the onboard power supply control unit and the light switcheshave now
been updated. This self-study programme contains
information about the new aspects of these components, as well as service-related information about
the outside lights on the new Audi A5.
395_030
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Contents
Overview
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
Control units
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
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.
NoteReference
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Overview
Fuses and relays
Fuse panel in dash panel on right
and CAN node connectors
Relay carrier and fuse panel in
luggage compartment on right
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
4
Page 5
Fuse panel and battery disconnecting
element at battery positive pole
Fuse panel in dash panel on left
Relay carrier and mounting bracket for onboard
power supply control unit in driver-side footwell
395_015
5
Page 6
Overview
Installation locations of Infotainment components
Information control unit,
front (MOST)
Radio (CAN)
Connection for external
audio sources R199 (MOST)
Telephone transmitter and receiver unit
CD changer (MOST)
6
Page 7
Radio (MOST)
Amplifier
(not with chorus)
Navigation
(MOST)
Digital satellite radio (USA)
TV tuner
DAB tuner
(MOST)
395_001
7
Page 8
Overview
Installation locations of control units on the powertrain CAN bus
and extended CAN bus
Headlight range control,
control unit
Data bus
diagnostic interface
Automatic gearbox
control unit
Adaptive cruise
control unit
Engine control unit
Airbag control unit
Control units on the powertrain CAN bus
Control units on the extended CAN bus
8
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ECD control unit (electroni-
cally controlled damping)
Lane change assistant
control unit (master)
Lane change assistant
control unit (slave)
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9
Page 10
Overview
Installation locations of control units on the dash panel insert /
suspension CAN bus
Auxiliary heater control unit
control unit
Data bus di ag-
nostic interface
ABS/ESP
Dash panel insert
control unit
Steering angle sensor
Control units on the dash panel insert/suspension CAN bus
10
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Parking brake and hand-
brake control unit
Park assis t
control unit
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11
Page 12
Overview
Installation locations of control units on the convenience CAN bus
Door control unit
Tyr e pre ssu re m on i tor-
ing system control unit
(USA only)
Data bus diagnostic
interface
Climatronic
control unit
Seat control units
Steering column electronics
control unit
Onboard power supply
control unit
Control units on the convenience CAN bus
12
Door control unit
Page 13
Convenience system
central control unit
Trailer detector
control unit
Rear-view camera system
control unit
Control unit for
special vehicles
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13
Page 14
Overview
Networking / vehicles with infotainment CAN bus
Rear-view camera
Air quality sensor
G238
Trailer detector
Refrigerant pres-
sure/temperature
sender G395
control unit
system
J772
J345
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
Onboard power supply
control unit
J519
Convenience system central
control unit
J393
Steering column
electronics con-
trol unit
J527
Seat and steering column adjustment control 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
Multi-function
steering wheel
control unit
J453
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
14
Alarm horn
H12
Climatronic control unit
J255
Fresh air blower
control unit
J126
Contro l mot ors fo r
flap control
Powe r outp ut
module for left
headlight
J667
Powe r outp ut
module for right
headlight
J668
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Powe rtrain CA N bus
Infotainment CAN bus
Yaw r ate sen d e r
G202
Convenience CAN bus
Dash panel insert/suspension CAN bus
Extended CAN bus
Control unit with
display in dash
panel insert J285
Park ass is t
control unit
J791
ABS control unit
J104
Steering angle
sender G85
Electric park and
handbrake control
unit
J540
Additional heater
control unit
J364
Diagnostics CAN bus
LIN bus
Subbus systems
Diagnostic port
Engine control
unit J623
Airbag control unit
J234
Automatic gearbox control unit
J217
ECD control unit
(electronically
controlled damp-
ing) J250
Data bus diagnostic interface J533
Adaptive cruise
control unit
J428
Lane change
assistant control
unit
J769
Lane change
assistant control
unit -2-
J769
Battery monitor
control unit
J367
3-phase AC
alternator
C
Radio
R
Digital sound
package control
unit
J525
Tel ep h one tra ns-
mitter and
receiver unit
R36
Headlight range
control, control
unit
J431
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Page 16
Overview
Networking / vehicles with MOST bus
Air quality sensor
G238
Refrigerant pres-
sure/temperature
sender
G395
Rear-view camera
system
J772
Tra ile r d ete c tor
control unit
J345
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
Onboard power supply
control unit
J519
Convenience system central
control unit
J393
Steering column
electronics con-
trol unit
J527
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
Multi-function
steering wheel
control unit
J453
Entry and start
authorisation
switch E415
Garage door oper-
Sliding sunroof
control unit
Anti-theft alarm
system sensor
Humidity sender
16
ating unit
E284
J245
G578
G355
Alarm horn
H12
Climatronic control unit
Fresh air blower
control unit J126
Control motors for
J255
flap control
Powe r ou tp ut
module for left
headlight
J667
Powe r ou tp ut
module for right
headlight
J668
Engine control
unit J623
Airbag control
unit J234
Automatic gearbox control unit
J217
ECD control unit
(electronically
controlled damp-
ing) J250
Headlight range
control, control
unit
J431
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Control unit with
display in dash
panel insert
J285
Park ass is t
control unit
J791
ABS control unit
J104
Yaw r ate sen d e r
G202
Steering angle
sender G85
Electric park and
handbrake control
unit
J540
Additional heater
control unit J364
Telephone trans-
mitter and
receiver unit
R36
Powe rtrain CA N bus
Convenience CAN bus
Dash panel insert/suspension CAN bus
Extended CAN bus
Diagnostics CAN bus
LIN bus
Subbus systems
Most bus
Operating elec-
tronics control
unit, navigation
J401
Diagnostic port
Data bus diagnostic interface J533
Adaptive cruise
control unit
J428
Lane change
assistant control
unit
J769
Lane change
assistant control
unit -2-
J769
Front information
control unit
Radio
Battery monitor
control unit
J367
J523
R
Voice input con-
trol unit
J507
Digital sound
package control
unit
J525
Digital radio
R147
TV tuner
R78
CD changer
R41
Connectio n for
external audio
sources
R199
3-phase AC
alternator
C
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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.
Relay carrier, left
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.
Infotainment CAN bus
Convenience CAN bus
395_007
395_008
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 connectors.
Dash panel insert/suspension CAN bus
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Diagnostics
To perform diagnostics on the Audi A5, the VAS testers 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 interchange 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 programs 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.
395_022
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.
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Control units
J533 Data bus diagnostic interface (gateway)
395_031
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
• Extended CAN bus - if the vehicle has one of the following optional extras:
Convenience CAN bus
optical bus system (depending on specification)
-ACC
- lane change assist
Te r m i n al 1 5 Ter m i n a l 30
5A
Data bus
diagnostic interface
5A
LIN bus
Powertrain CA N bus
J533
Dash panel insert/
suspension CAN bus
20
Diagnostics CAN bus
Extended CAN bus
Infotainment CAN bus
395_016
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New features
The data bus diagnostic interface now also includes a
battery power management function.
For this purpose, a LIN line is connected to a socalled "battery data module" located directly adjacent
to the negative pole on the vehicle battery.
Versions
In total, there are four different versions of the data bus diagnostic interface:
diagnostic interface
As a result, it has been possible to dispense with the
wake-up line between the diagnostic interface and
the control unit with display in dash panel insert,
which are familiar from the gateways of other vehicles.
The control unit with display in dash panel insert
J285 is now connected to the diagnostic interface
together with various suspension control units via
the dash panel insert/suspension CAN bus. This
high-speed CAN bus has wake-up capability, which is
why the line is no longer required.
Data bus
J533
with connectivity
for the
Extended CAN bus
Address word
As on other Audi vehicles, the data bus diagnostic
interface J 533 can be
accessed via address word 19 using the VAS diagnostic testers.
with connectivity
for the
Most bus
without connectivity
for the
Extended CAN bus
with connectivity
for the
Infotainment CAN bus
with connectivity
for the
Extended CAN bus
Installation location
The data bus diagnostic interface on the Audi A5 is
located behind the dash panel and can be accessed
by removing the trim panels in the right footwell.
without connectivity
for the
extended CAN bus
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Control units
Extended adaption
The data bus diagnostic interface J533 has what is known as "extended adaption" capability. The adaption program can be used to start diagnostic routines and perform settings.
As in all other control units, manual encoding is no longer needed.
The following actions and settings can be performed using the "extended adaption" function:
1 Transport mode can be activated and deactivated.
2 Static current power-down stages can be set manually. This can be used to check for correct response of
individual control units to preset power-down stages.
3 A quick static current measurement can be made. The measured actual static current is output through a
data block and displayed on the diagnostic tester.
4 New battery parameters can be entered into the data bus diagnostic interface. This must be done after
changing the battery and after replacing the diagnostic interface .
5 The battery data module is flashable. The battery data module is connected to the diagnostic interface via
the LIN bus.
6 The light power of MOST bus users can reduced. This gives an indication of the ageing of the optical
fibres.
Component protection function
The data bus diagnostic interface is the master for
the component protection function. The task of the
component protection function is to prevent the use
of stolen control units in a different vehicle. All new
control units with a component protection function
must be adapted online using the diagnostic tester.
As with the immobiliser, the so-called Fazit database
is used for this purpose. If a control unit is not
adapted, it will only have limited operating capability.
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Battery monitor control unit J367
(battery data module)
The battery data module measures the following parameters:
– Charging and discharge currents of the vehicle battery
– Battery voltage
– Battery temperature
These three parameters and other information which the module receives from the diagnostic interface via
the LIN bus is required by the "Electronic Battery Sensor". This software computes the actual battery state and
sends information to the LIN master, i.e. the data bus diagnostic interface.
"Quick static current measurement" capability has been implemented on the battery data module. This function is started using the diagnostic tester in the "extended adaption" mode of the data bus diagnostic interface J533. The measured static current is then indicated on the diagnostic tester. This function allows a quick
static current measurement to be performed without the need for labour-intensive preparation of the vehicle.
The battery data module is flashable. The flash cycle is also started in the "extended adaption" mode of the
data bus diagnostic interface. The new software is then transmitted to the battery data module via the diagnostic tester, the diagnostics CAN bus, the data bus diagnostic interface and the LIN bus.
Te rm i na l 15Te rm i na l
30
5A 5A
Data bus
diagnostic interface
J533
LIN bus
3-phase AC
generator
B+
Battery data
module
Measuring lead
Te r m i n al 3 0
Vehicle battery
A
110A
110A
80A
Crash
power-off
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Control units
Functions of the Electronic Battery Sensor
The Electronic Battery Sensor in the battery data module computes the following parameters, which are transmitted to the data bus diagnostic interface J533 via the LIN bus:
1 "Battery down" recognition: if the battery data module fails to detect a battery for longer than 30s, a corre-
sponding bit is set
2 The voltage currently required for optimal battery charging
3 The "engine start capability" bit (indicates whether the battery is presently capable of starting the engine
or not)
4 How much charge can currently be withdrawn from the battery until the limit of engine start capability is
reached
5 Actual battery state of charge
6 Battery ageing (ageing of the battery can be determined from parameters such as energy storage capac-
ity and actual battery power)
7 Battery static voltage
8 Battery internal resistance
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Design of the battery data module
The core of the battery data module is a CPU which determines the three measurands and communicates with
the diagnostic interface.
Battery data module
LIN bus
Te r m i n al 3 0
Shunt
Te r m i n al 3 1
Vehicle battery
A
Battery current measurement
The battery current is measured at the battery negative pole, to which the battery data module is also
attached. The total current at the battery negative
pole flows through the battery data module, or, to
be precise, through a shunt resistor. The shunt
resistor has a resistance in the milliohm range. This
value must be so small as to minimise power loss,
and therefore heat build-up.
Battery voltage measurement
Battery voltage is monitored directly at the battery
positive pole by voltage measurement.
395_019
The falling voltage at the shunt resistor is proportional to the electrical current. The CPU measures
the voltage drop and can therefore compute the
electrical current flowing back into the battery.
For this purpose, a measuring lead is routed from
the positive pole to the battery data module.
Battery temperature measurement
The battery temperature is measured by an
NTC temperature sensor in the battery module.
As the battery data module is attached directly to
the battery, the battery temperature can be determined reliably via the NTC temperature sensor
within the battery module and the data can be subsequently processed by the software.
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Control units
Alternator
Control unit with display
control unit
J285
Dash panel insert CAN bus
Data bus
diagnostic interface
J533
Data transfer
In addition to the battery data module, the alternator is the second LIN bus user on the data bus diagnostic interface J533. All data relevant to the status
of the alternator is read in at J533 via the LIN connection.
control unit
Battery monitor con-
trol unit J367
LIN bus
Alternator
C
395_005
The information which is required to activate the
alternator warning lamp is provided by the data bus
diagnostic interface J533 and read in by the dash
panel insert CAN via the dash panel insert control
unit J285.
Diagnostics
In case of problems with the alternator, the following components and terminals should be checked:
– Battery poles
– Ribbed vee belt voltage
– Alternator mounting
– Terminal 30 screw connection on alternator
– Offset between body earth and engine earth (= alternator earth)
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Diagnostics
As the data bus diagnostic interface J533 is the master control unit for the alternator as a LIN bus user, the
address word "19" must be selected for alternator diagnostics using the VAS tester. The data blocks contain
information on the status of the alternator.
Among other things, the following information is displayed:
– Alternator communication status
– Alternator type, manufacturer and size
– Alternator status, electrical / mechanical / thermal
In the event of sporadic alternator faults, data is available in the following format in set 13 of the history data
on the data bus diagnostic interface J533:
YYYY-MM-DD-hh:mm*I-J-K-L*RRR.R*AAAAA**
YYYY-MM-DD-hh:mm*I-J-K-L*RRR.R*AAAAA**
YYYY-MM-DD-hh:mm*I-J-K-L*RRR.R*AAAAA**
YYYY-MM-DD-hh:mm*I-J-K-L*RRR.R*AAAAA**
YYYY-MM-DD-hh:mm*I-J-K-L*RRR.R*AAAAA**
YYYY-MM-DD-hh:mm*I-J-K-L*RRR.R*AAAAA**
This means:
YYYY-MM-DD = date
hh:mm = time
I = 1 means there was an electrical fault in the alternator
= 0 means there was no electrical fault in the alternator
K = 1 means there was a mechanical fault in the alternator
= 0 means there was no mechanical fault in the alternator
L = 1 means there was a thermal fault in the alternator
= 0 means there was no thermal fault in the alternator
M = continuously negative energy balances
RRRR.R = duration of last trip in hours
AAAAA = number of data entries on sporadic faults
This means: the battery becomes discharged, as more electrical current is consumed
than is supplied by the alternator
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Control units
Battery / external starter connection
Installation location: in the spare-wheel recess in the luggage compartment
Fuse panel
and battery
disconnector
at the positive pole
Battery data module
at the negative pole
Depending on engine size and specification, batteries rated from 61Ah / 330A to
110Ah /520A are used on the Audi A5.
An external starter connection is installed in the plenum chamber. It is easily accessible and can be used for
battery backup in the showroom.
395_010
For exact assignments to the associated spare part
numbers, please refer to the electronic parts catalogue (ETKA) .
Slave start connector in the plenum chamber
395_011
28
Earthing bolt in the plenum chamber
395_012
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Onboard power supply control unit J519
395_009
Functions
The onboard power supply control unit J519 hat the following functions on the Audi A5:
Lighting functions:
• Outside light master and activation of the front lights
• Emergency light operation logic in case of failure of the main central processor
• Plausibilised terminal 15: terminal 15 via CAN or terminal 15 via discrete line
• Reading in the rotary light switch via LIN bus connection
• Reading in the rain/ light sensor via LIN bus connection
• MMI gateway for tourist light
(implemented in the headlight range control, control unit J431)
• Activation of the front turn signals
(the turn signal master is the convenience electronics control unit J393)
• Activation of the side turn signals via the door control units
• Reading in the hazard warning button
• Emergency turn signal master (direction indicator function, hazard warning lights, flashing light collision
warning) in case of failure of J393
• Interior lighting master (interior light, front and rear footwell lights)
• Function and locating lights (terminals 58s, 58st and 58d)
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Control units
Driver information:
• Reading in the ambient temperature
• Reading in the oil pressure switch
• Reading in the brake pad wear warning
• Reading in the brake fluid warning
• Reading in the coolant warning
• Reading in the low washer fluid warning
• Reading in the light warning
Air conditioning functions:
• Activation of front seat heater
• LIN gateway for air quality sensor and refrigerant pressure sensor
• Activation of the air conditioner compressor
Windscreen wipe/wash functions:
• Activation of the wiper motor control unit J400 via LIN bus connection
• Reading in the rain/light sensor via LIN bus connection
• Activation of the windscreen washer pump
• Activation of the headlight washer pump
Interfaces to the convenience electronics control unit J393:
• Enabling of the electrical steering column lock (discretely and via CAN)
• Feedback from discrete terminal 15 (to J393 via CAN)
• Reading in the rear-window roller sun blind switch
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Other functions:
• Activation of the signal horn relay
• Activation of the Servotronic valve
• Reading in the reversing light switch (discrete signal or CAN information for models with automatic
gearbox)
• Reading in the forward gear selector
• Reading in the handbrake switch (CAN information from the electromechanical parking brake)
• Enabling the power supply to the electrical seat adjustment system (via external relay)
• Reading in the bonnet contact
• LIN gateway for garage door operation control unit J530
• Reading in settings via MMI (outside light, interior light, wiper)
Special functions:
• Encoding option daytime driving light deactivated
• Energy management power-down stages
(interior light, footwell lights, Coming/Leaving Home, daytime driving light, main beam deactivated)
• Transport mode
(interior light, footwell lights, Coming/Leaving Home, daytime driving light, fog light)
• Component protection function
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Control units
System overview
The onboard power supply control unit J519 is a
convenience CAN bus user. It is the master control
unit for the LIN bus users wiper motor control unit
J400, the rain/light sensor G397, as well as light
switch E1 for the first time.
Air quality
sensor
G238
Refrigerant pressure
and temperature
control unit G395
LIN bus
Onboard power supply
The onboard power supply control unit performs a
gateway function for the following LIN bus users: air
quality sensor G238, refrigerant pressure/temperature sender G395 and the garage door operation
control unit J530.
Convenience CAN bus
control unit
J519
LIN bus
Light switch
E1
Wiper motor
control unit
J400
Garage door
operation
control unit J530
Address word
As on all other Audi vehicles, the onboard power
supply control unit can be accessed via the address
word 09 using the VAS diagnostic testers.
Rain and light
detector sensor
G397
395_025
Installation location
The data bus diagnostic interface on the Audi A5 is
located behind the dash panel and can be accessed
by removing the trim panels in the left footwell.
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Light switch
Function
For the first time, light switch E1 is a LIN slave of the
onboard power supply control unit.
The light switch has four electrical connections. In
addition to the power supply and earth connections,
there is a LIN bus connection and a discrete line
leading to the onboard power supply control unit.
The light switch indicates its switch position via the
LIN bus.
Discrete line
Onboard power supply
control unit
J519
(redundancy)
LIN bus
The discrete line serves as a redundancy line for
plausibilising the switch position. If the same switch
position is not indicated to the onboard power supply control unit via both lines, the onboard power
supply control unit activates the emergency light
function. The following entry appears in the fault
memory: "Light switch implausible switch position" .
Power
supply
Light switch
E1
Earth
395_024
Wiper motor control unit
The wiper motor control unit J400 is already known from other Audi models.
The following functions have been implemented on the Audi A5:
• Alternating wiper blade parking position
• Engine speed reduction at reversing points
• Intermittent control via rain sensor
• "Teardrop" (afterwipe) function
• Snow load protection
• One-level wiping speed reduction when vehicle stops
• Flick wipe is speed setting 2
• Service position for wiper blade replacement
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Control units
Outside lights, front
Headlights
A distinction is generally made between three variants on the Audi A5:
• Halogen headlights
• Bi-xenon headlights
• Bi-xenon headlights with adaptive light
Arrangement of the front lamps on the halogen headlight variant
Main-beam headlight
Tur n s ign al
The following bulbs are used on the halogen headlight variant:
12 V bulb Typ e Rated power
Low-beam headlight
Side lights
(ECE*)
White cover
Sidemarker
(SAE**)
Yellow cover
395_013
Side light W5WH 5 watts
Low-beam headlight H 7 55 watts
Main-beam headlight H 7 55 watts
Turn s i g nal PY24W 24 watts
Sidemarker (SAE **) W5WH 5 watts
* ECE variant for the European market
** SAE variant for the North American market
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Arrangement of the front lights on the bi-xenon headlight and bi-xenon headlight with adaptive light variants
Side light
Tur n s ign al
Daytime driving light / dimmed as position light
The following bulbs are used on the bi-xenon headlight variant:
Low-beam headlight / main-beam headlight
White cover
(ECE*)
Sidemarker
(SAE**)
Yellow cover
395_014
12 V bulb Ty pe Rated power
Side light W5WH 5 watts
Low-beam headlight D3S 35 watts
Main-beam headlight D3S 35 watts
Turn s i g na l H21W 21 watts
Sidemarker (SAE**) W5WH 5 watts
Daytime driving lights 8 LEDs
* ECE variant for the European market
** SAE variant for the North American market
Light bulb replacement
To replace the bulbs, it is necessary to remove the
headlight. This can be done using a screwdriver
with Torx blade included in the car tool kit. In the
case of the halogen headlight, no provision has
been made for replacement of the turn signal bulb
by the customer.
In the case of the bi-xenon headlight, the turn signal
bulb and the side light bulbs can be replaced by the
customer.
Please observe the safety instructions in the current
service literature for handling gas discharge lamps.
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Control units
Fog lights
The fog lights on the Audi A5 are integrated in the
bumper. After removing the grille and undoing the 2
Torx screws, the fog lights can be removed and the
bulb replaced. A 55 watt H11 bulb is used.
395_021
Sidelight
The side turn signal uses LED technology and is
housed in the door mirror housing. The side turn
signal is activated by the respective door control
unit. The side turn signal and the electrically adjustable outer mirror glass drive motor can be replaced
individually in the service workshop.
395_020
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Outside lights, rear
Tail lights
The tail lights on the Audi A5 are of four-piece design, with two light assemblies in the boot lid and two light
assemblies in the body side panels.
Tail light/rear fog light
dimmed for tail light
The following bulbs are used on the tail lights:
12V bulb Typ e Rated power
Reversing light
Tur n s ign al
Sidereflex
Sidemarker (LED)
SAE only **
Tail light / brake light
dimmed for tail light
Reflector
395_023
Reversing light W16W 16 watts
Turn s i g na l W16W 16 watts
Tai l l i gh t P21W 21 watts (dimmed)
Rear fog light P21W 21 watts
Brake light P21W 21 watts
Sidemarker (SAE only **) LED
** SAE variant for the North American market
Light bulb replacement
For replacement of the bulbs, there is a maintenance flap on the boot lid trim through which
access can be gained to the tail light bulbs in the
boot lid.
The tail lights in the body side panels must be
removed to replace the light bulbs. This can be done
by removing the mounting bolt in the side panel and
taking the lamps out of the body side panel.
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Note
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Self-study programmes relating to the Audi A5
The following self-study programmes have been prepared for the Audi A5:
– SSP 392 Audi A5
– SSP 393 Audi A5 - Convenience Electronics and Driver Assist Systems
– SSP 394 Audi A5 - Suspension
– SSP 395 Audi A5 - Networking
SSP 392 Audi A5
– Body
– Occupant protection
– engine
– Gearboxes
– Suspension system
– Electrical systems
– Infotainment
– Air conditioning
– Service
– Diagnosis
Order number: A07.5S00.34.20
SSP 393 Audi A5 - Convenience Electronics and Driver Assist Systems
– Dash panel insert
– Door control unit
– Convenience system control unit
– Electronic ignition lock
– Audi Service Key
Order number: A07.5S00.35.20
SSP 394 Audi A5 - Suspension
– Front axle
– Rear suspension
– Brake system
– Steering system
Order number: A07.5S00.36.20
SSP 395 Audi A5 - Networking
– Networking / topology
– Battery monitoring
– Onboard power supply control unit
– Outside lights
Order number: A07.5S00.37.20
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Vorsprung durch Technik www.audi.de
395
All rights reserved. Technical
specifications subject to
change without notice.
Copyright
AUDI AG
I/VK-35
Service.training@audi.de
Fax +49-841/89-36367
AUDI AG
D-85045 Ingolstadt
Technical status: 01/07
Printed in Germany
A07.5S00.37.20
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