light AUDI A8 2003 D3 / 2.G Technical Features Manual

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D1
30
15
J329J53J695J694
75xE415
N376
6x
J623
J518
50R
50R
3
12
12
E408
STOP START
58s
210 210
D1 Inhibitor reading unit
E408 Entry and start authorisation button
E415 Entry and start authorisation switch
J53 Starter motor relay
J329 Terminal 15 voltage supply relay
J518 Entry and start authorisation
control unit Block diagram
SSP282_024
Colour code
= Input signal
= Output signal
= Positive supply
= Earth
J623 Engine control unit
J694 Terminal 75x voltage supply relay
J695 Starter relay 2
N376 Ignition key withdrawal lock magnet
Additional signals
F - Brake light switch
Manual gearbox -> F194
Clutch pedal switch
Automatic gearbox -> Selector lever
position from automatic gearbox
control unit J217
Terminal 50/starter
1
2
3

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Highlights of automatic gearbox 09E
The 6-speed planetary gearbox is based on the
Lepelletier principle.
This concept is characterised by harmonic
gear ratio steps and the implementation of six
forward gears and one reverse gear with only
five selector elements.
Use is made in this gearbox of a new internal
gear oil pump featuring a lower delivery
volume and reduced leakage.
In addition, it was possible to achieve
optimisation of the oil supply with lower
leakage rates in the hydraulic control system.
The "stationary disconnection" function
reduces engine output when the vehicle is
stopped with a gear engaged by interrupting
power transmission.
A particularly noteworthy feature of the 09E
automatic gearbox is the relocation of the
front-axle differential (flange shaft) to in front
of the torque converter.
The distance between flange shaft and engine
flange is now only 61 mm (01L = 164 mm).
Gearbox
SSP282_044
SSP282_045
(AL 600-6Q)

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All axle components are new on account of
the geometric and kinematic modifications as
compared to the predecessor model, the air
suspension and the weight reductions
achieved.
Front axle
The familiar four-link front axle was retained
for the Audi A8 '03.
A significant new feature is the air
suspension in combination with
electronically controlled dampers (refer to
Section on air suspension).
Front axle highlights
– Subframe
– Auxiliary frame
– Anti-roll bar
– Wheel bearing housing
– Wheel bearing with wheel speed sensing
– Mounting bracket for damper unit
Front axle design and operation are
described in SSP 285.
SSP282_050
Running Gear

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All axle components are new on account of
the geometric and kinematic modifications as
compared to the predecessor model, the air
suspension and the weight reductions
achieved.
Rear axle highlights
– Use of air suspension in conjunction with
electronically controlled damping
– Aluminium subframe to help
reduce weight
– Connection of anti-roll bar to trapezium
link
– Use of shorter track rod to reduce change
in toe on compression and extension of
suspension
– Use of ball studs to connect wheel bearing
housing and track rod, thus reducing
secondary spring rate
– Use of slotted bonded rubber bushes in
upper transverse link and connection
between trapezium link and subframe
Rear axle design and operation are
described in SSP 285.
Rear axle
The rear axle is a more advanced version of
the familiar Audi A8 trapezium-link axle.
Running Gear
SSP282_051

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Bus topology
Electrical System
The increasing demand for additional
functions and convenience in the vehicle calls
for the use of ever more wide ranging
electronics.
The increased use of electronics also requires
a new approach to data transfer between the
individual control units. This also applies to
the Audi A8 ´03, in which more than 70 control
units have to communicate.
Distance regulation
control unit J428
Electric park and
handbrake control
unit J540Headlight range
control unit
J431Airbag control unit
J234ABS with EDL
control unit
J104
Engine control unit
J623Adaptive
suspension control
unit J197 Engine control
unit 2 J624Automatic gearbox
control unit
J217
Anti-theft/
tilt system control
unit J529
Boot lid control unit
J605Wiper motor control
unit J400Garage door
operation control
unit J530 Multifunction
steering wheel
E221
Convenenience
system central
control unit J393On-board power
supply control unit
J519
On-board power
supply control unit 2
J520Steering column
electronics control
unit J527Steering angle
sender G85
Driver side door
control unit J386Front passenger
side door
control unit J387Rear left door
control unit J388Rear right door
control unit J389Seat adjustment
control unit
J136Front passenger
seat adjustment
control unit J521 Control unit with
display in dash panel
insert J285
Diagnostic connection T16
Dash panel insert CAN
Drive system CAN
Diagnosis CAN
Convenience CAN
Internal bus link
LIN
Adaptive cruise control
CAN

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Electrical System
The headlight in the Audi A8 ´03 combines both
design elements and innovative technology.
Headlight versions:
– Basic halogen version H7
Dynamic headlight range control is not
necessary with halogen headlights. The air
suspension provides compensation for static
load statuses and a thumbwheel is therefore
also not required.
– Bi-xenon version
– Bi-xenon version with integrated adaptive
light function
The headlight range control unit J431 is
responsible for providing static and dynamic
compensation for vehicle tilting as well as
actuation of the static adaptive light
function. The sensor signals of the 4-level air
suspension system are picked off by the
drive system CAN for control purposes. A
distinction is made between the two
gas-discharge lamp versions by way of
appropriate encoding (1 or 2) at the
headlight range control unit.
Lighting system
Front lights
SSP282_056
HPV stands for high-performance bulbs,
which are extremely compact and have a far
longer service life. They have a 25 % lower
power input than conventional bulbs. Such
bulbs cannot be replaced by customers.
Both bi-xenon versions feature an ellipsoid
module with a moving screen to achieve both
dipped beam and main beam with xenon light.
The automatic dynamic headlight range control
represents a more advanced version of the
standard automatic control system. It provides
headlight tilt compensation not only for various
load statuses but also as a dynamic function
reacting to differences in running gear
inclination caused by acceleration and
deceleration.
Dipped beam/main beam
(Bi-Xenon/D2S - gas-discharge lamp)Turn signal indicator
(2 x 16 W HPV bulb - yellow) Parking light
(W5W/5 W bulb)Adaptive light
(H8/35 W bulb)
Additional main beam
Headlight flasher
(H7/55 W bulb)Reflector
for adaptive light

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Light functions
SSP282_087
Adaptive light
The additional reflector with a 35 W H8
halogen bulb is actuated as the situation
requires to ensure earlier perception of other
road users or obstacles.
When reversing or parking, both adaptive
lights are activated to provide the driver with a
better overall view of the surrounding area.
Adaptive light
Control of the headlight functions is a complex
process.
It involves real time evaluation of several
signals (e.g. vehicle speed, steering angle and
turn signal indicator) by the headlight range
control unit J431.
SSP282_092
The optional headlights with adaptive light
function are a clearly visible innovative feature
in the Audi A8 ´03. To implement this function,
the headlights are provided with an additional
reflector between dipped beam and main
beam.

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Electrical System
Side lights
This is the first Audi vehicle to be fitted with
LED-type lights. The individual LEDs are fitted
in a graduated arrangement under a
transparent glass lens and give off a yellow
light when switched on. They appear neutral in
colour when switched off.
LED technology offers numerous advantages:
– Rapid attainment of full power
– Up to 50 % energy saving as compared to
bulbs
– Service life equal to that of the vehicle
– Shallow design
– Bright, distinct marking effect makes
vehicle more noticeable
SSP282_088
Assistant lighting system
This system adapts the vehicle lighting to the
prevailing light conditions. For this purpose
the light switch must be set to AUTO. The rain
and light detector sensor G397 establishes
the prevailing light conditions and activates
the vehicle lighting system if appropriate.
Assistant lighting applies to:
– Dipped beam
– Parking lights
– Tail lights
– Number plate light
Operation of the assistant lighting system is
described in SSP 288 – Audi A8 ´03
Distributed Functions.
SSP282_110

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Rear lights
SSP282_089
The newly designed rear lights are an ideal
combination of design, function and ultra-
modern technology.
Light-emitting diodes are used for the tail light,
brake light and turn signal indicator functions.
Newly developed "High-performance" bulbs
are employed for the lesser used rear fog light
and reversing light functions.
The high-level third brake light also features
LEDs.
Interior lighting
In addition to the usual interior, reading and
door lights, the new Audi A8 also features new
"ambiente" and door contour lights with
variable functions depending on the lighting
profile selected.
Users can choose between the following
lighting profiles:
– Highway
– City
– Cockpit
– Fond = Rear
Rear light actuation is described in
SSP 287 – Audi A8 ´03 Electrical
Components.
SSP282_111
Brake/tail light on
side panel
– Red LEDs
Turn signal
indicator
– Yellow LEDsBrake/tail light on
boot lid
– Red LEDs
Rear fog light
– 16 W HPV bulb
Reversing light
– 16 W HPV bulb
Reflector

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Heating/Air Conditioner
SSP282_103 Fresh-air intake duct
temperature sensor G89
Flap control
motor potentiometers
G92, G113, G135, G136,
G137, G138, G139, G140,
G143, G317, G318, G349,
G350, G351, G352
Air quality sensor G238
Left/right vent temperature
sender G150/G151
Centre vent temperature
sender G191
Evaporator outflow temperature
sender G263
High-pressure sender G65
Sunlight penetration
photosensor G107
Solar cells in sunroof C20
System layoutControl unit with display
in dash panel insert J285
MOST busFront information display and
operating unit control unit J523
Rear right footwell heater
element Z43 Rear left footwell heater
element Z42 Fresh-air blower control unit
J126 with fresh-air blower V2Diagnosis CAN
Data bus diagnostic
interface J533
Sunroof electronics
control unit J528 Humidity
sender G355
Humidity sender
heater N340
Climatronic
control unit J255
Convenience CAN
Additional heater
control unit J364 Rear Climatronic control
and display unit E265Energy management
control unit J644Drive system CANEngine control unit J623Front information and display and
operating unit control unit J685
Radiator fan
control unit J293
Radiator fan V7
Air conditioning system compressor regulating valve N280
Flap control motors
V68, V71, V102, V107, V108, V109,
V110, V111, V113, V199, V200, V220,
V218, V219, V221
Coolant circulation pump V50
Left/right heat regulation valve N175/N176
Heated windscreen control unit J505
Heated windscreen Z2
Driver seat/front passenger seat ventilation control unit
J672/J673
Front left/front right heated seat Z45/Z46
Temperature sender for front left/front right seat
G344/G345