2003 AUDI A8 Steering wheel

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Safety systems
2-stage front airbags
The 2-stage triggering of the front airbags
provides optimum restraint in crash
situations at around 30 km/h. There is a
separate firing pellet for each stage in the
driver's and front passenger's airbag. These
ignite successively at specified time intervals.
Ring airbag
Passenger Protection
SSP282_070
A so-called "ring airbag", which inflates like a
life belt, is used on the driver's side. This
radial inflation method affords particular
protection to drivers sitting very close to the
steering wheel. The centre of the steering
wheel does not move as the airbag unfolds
and is inflated in the form of a ring. A
rectangular fabric layer is additionally sewn
to three sides of the ring. One side is left free
to allow the airbag to slide over the non-
moving centre section of the steering wheel. This airbag design satisfies the requirements
of the latest American legislation and
involves compliance with biomechanical
values for so-called "Out Of Position" (OOP)
driver posture. If the driver's head or upper
part of the body is very close to the steering
wheel at the time of airbag unfolding (OOP),
this airbag concept can prevent serious
injury.

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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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Multifunction steering wheel
A new multifunction steering wheel has been
introduced as standard. This is equipped with
special paddles (as used in formula 1 and for
the Le Mans R8) for manual shifting of the
6-speed Tiptronic
®. The voice control option
for radio, CD changer, telephone, navigation
system and MMI address book can also be
operated by way of the multifunction steering
wheel.
Dash panel insert display
Selection menu for:
– Radio station
– CD track
– Telephone address book
– Navigation system information
display
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Press MODE button:
For telephone, navigation system and
radio/CD menu selection
Turn left function control:
To select menu item
Press left function control:
For selection within chosen menu item
To accept a telephone callPress PTT (push to talk) button:
To activate/deactivate voice control
Turn right function control:
To regulate volume
Press right function control:
To repeat last navigation system message
Volume level/navigation
message repetition
control
Voice control
start/termination
button MODE button Menu selection
controlPaddle –Paddle +