2005 AUDI A6 light

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The control unit in dash panel insert J285 is
available in two variants.
The High-Line variant with colour display only
comes in vehicles with adaptive cruise control.
As in the A8 '03, the anti-drive-off feature and
gateway are no longer integrated into the dash
panel insert.
The handy position of the rotary light switch has
meant that the indicator lights for dipped beam
headlight, fog light and rear fog light could also be
fitted directly in the rotary light switch.
Likewise, the buttons for instrument lighting, the
auto-check system and the daily mileage counter
are now positioned to the right, next to the dash
panel insert, in the button module (operating
buttons for dash panel insert E493).
Convenience electrics
Lamp failure
If an exterior lighting lamp fails, a symbol appears
in the central display indicating which lamp has
failed. If you now press the Check button, the failed
lamp is also described by a text message in the
central display.
Outside temperature indicator
The instrument cluster evaluates both the
temperature sensor for outside temperature G17
and the outside temperature signal from the
Climatronic control unit J255. The lower of the two
values is displayed.
Control unit in dash panel insert J285
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Functions
The main function of the control unit for on-board
power supply is to read in switch information and
activate power outputs.
It is familiar from the Audi A8 ‘03 and has been
adapted to new functionalities in the Audi A6 ´05.
Master functions
The following master functions are implemented in
the control unit for on-board power supply.
– External lighting control
– LIN master for the control unit for
wiper motor J400
– LIN master for the sensor for rain and
light detection G397 (for details of function,
see Sensor for rain and light detection)
Stand-by master function
If the central control unit for the convenience
system J393 fails, the control unit for on-board
power supply J519 takes over the stand-by master
function. It sends the information for direction
indicators to the CAN bus.
Convenience electrics
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Reference
Further information on this can be found in the
SSP 288, Audi A8 ’03 – Distributed Functions.
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Control unit for on-board power supply J519
J519
G397 J400

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Emergency function
The software for the control unit for on-board power
supply can be used to implement emergency
functions. If a fault is detected in the rotary light
switch or if there is an open circuit in the line to the
rotary light switch, the control unit for on-board
power supply switches the driving light on.
Other functionalities
In addition to the master functions, the following
functions are also available in the control unit for
on-board power supply.
– Steering column adjustment
– Footwell lighting
– Selector gate lighting
– Direction indicator control, front and side
– Signal horn activation
– Windscreen washer pump activation
– Steering column memory
Versi on s
There are three functional versions of the control
unit for on-board power supply:
– Low-Line version (with no electric steering
column adjustment, no xenon, no daytime
driving lights)
– Mid-Line version (with no electric steering
column adjustment, with xenon and daytime
driving lights)
– High-Line version (with electric steering column
adjustment, xenon and daytime driving lights)
Installation position
The control unit for on-board power supply is
installed on the left behind the dash panel. It can be
accessed by removing the footwell cover.
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Function diagram
Convenience electrics
E1 Light switch
E3 Hazard warning light switch
E7 Fog light switch
E18 Switch for rear fog light
F4 Reversing light switch
F266 Contact switch for bonnet
G357 Sender for vertical steering column adjustm.
G358 Sender for axial steering column adjustment
G397 Sensor for rain and light detection
G474 Sensor for pivot module position, left
G475 Sensor for pivot module position, right
H2 High-pitch horn
H7 Low-pitch horn
J4 Relay for dual-pitch horn
J400 Control unit for wiper motor
J431 Control unit for headlight range control
J519 Control unit for on-board power supply
J667 Power module for left headlight
J668 Power module for right headlightK4 Indicator light for parking light
K6 Indicator light for hazard warning lights
K13 Indicator light for rear fog light
K17 Indicator light for fog lights
L9 Lamp for light-switch lighting
L13 Gas discharge light, left
L14 Gas discharge light, right
L22 Lamp for left fog light
L23 Lamp for right fog light
L174 Lamp for daytime driving light, left
L175 Lamp for daytime driving light, right
M1 Lamp for parking light, left
M3 Lamp for parking light, right
M5 Lamp for direction indicator light, front left
M7 Lamp for direction indicator light, front right
M18 Lamp for side direction indicator light, left
M19 Lamp for side direction indicator light, right

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N395 Magnet for cover adjustment,
left headlight
N396 Magnet for cover adjustment,
right headlight
V5 Windscreen washer pump
V48 Left control motor for headlight range control
V49 Right control motor for headlight range
control
V123 Motor for vertical steering column
adjustment
V124 Motor for axial steering column adjustment
V318 Control motor for dynamic cornering light,
left
V319 Control motor for dynamic cornering light,
right
W9 Footwell light, left
W10 Footwell light, rightAdditional signals
1Terminal 58
2 Terminal 58s
3CAN Drive High
4CAN Drive Low
5CAN Convenience High
6CAN Convenience Low
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System overview
Convenience electrics
– Hall sender 1 for vertical adjustment of the
steering column
– Hall sender 2 for axial adjustment of the
steering column
– Bonnet switch for anti-theft warning system–Rotary light switch
–Hazard warning button
– Switch for reversing light (manual transmission)
– Sensor for rain and light detection (via LIN bus)
– Front direction indicator lights, left and right
– Side direction indicator lights, left and right
– Front parking light, left and right
– Dipped beam headlight, left and right
– High beam headlight, left and right
– Fog lights, left and right
– Relay for headlight cleaning system
– Windscreen washer pump
– Control unit for wiper motor (via LIN bus)– Supply, terminal 58
– Front footwell lights, left and right
– Relay for dual-pitch horn
– Steering column adjustment (vertical/axial)
– Selector lever lighting
– Indicator light for hazard warning lights
– Magnets for cover adjustment
Headlights (left and right)
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The control unit for on-board power supply J519 evaluates the following input signals:
The control unit for on-board power supply J519 controls the following loads:

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Diagnosis
Basic settings
After the control unit for on-board power
supply J519 or the steering column or the switch for
steering column adjustment E167 is replaced, a
basic setting in axial and vertical position must be
implemented for the steering column.
Actuator test
An actuator test can be used to carry out the
following checks:
– Indicator light for hazard warning lights K6
– Lamp for parking light, left M1
– Lamp for parking light, right M3
– Lamp for dipped beam headlight, left M29
– Lamp for dipped beam headlight, right M31
– Lamp for high beam headlight, left M30
– Lamp for high beam headlight, right M32
– Lamp for left fog light L22
– Lamp for right fog light L23
– Lamp for daytime driving light, left L174
– Lamp for daytime driving light, right L175
– Direction indicator lights, left
– Direction indicator lights, right
– Footwell light, left W9
– Footwell light, right W10
– Wiper, top turning position
– Wiper, bottom turning position
– Windscreen washer pump V5
– Relay for dual-pitch horn
–Terminal 58
Coding
The control unit for on-board power supply J519 can
be coded for the functions
–Daytime driving light,
– Driving light assistant,
– Headlight type,
– Footwell lighting and
–Country versions
using the diagnosis tester.
Note
The actuator test can be performed either
sequentially (in sequence) or selectively
(individual selection).

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A combined sensor for rain and light detection is
used for the first time in the Audi A6 ’05.
The sensor includes a light-control assistant
function, which relieves the driver of the job of
having to switch the driving light on manually, as
well as a wiper control function, which depends on
the amount of moisture on the front windscreen.
The development goal here was to integrate these
functions in a compact housing.
The sensor is connected as a LIN slave to the control
unit for on-board power supply J519.
Installation position
The sensor for rain and light detection is located on
the windscreen in the attachment base of the
interior mirror.
Tasks of the light sensor
– Switch the driving light on and off automatically
– Activate the Coming Home/Leaving Home
function
– Day/night detection for rain sensor
Switch-on conditions
The light sensor supplies the control unit for
on-board power supply with information for
switching on the driving light in the following
situations:
–Dawn/dusk
–Darkness
– Entering/travelling through tunnels
– Travelling through forests
Convenience electrics
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Note
Allowances are made for disruptive influences,
such as external light, dirt, vibrations or smears
caused by wiper blades.
LIN Terminal 30
Te r m i n a l 3 1
Sensor for rain and light detection G397
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