2003 AUDI A8 engine

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Rear end
The rear end has been completely
redeveloped. The two large central castings
are the one connecting the sill panel/
longitudinal member and the C/D-pillar
connecting element.
SSP282_032
The C/D-pillar connecting element (large
upper casting) accommodates the
suspension strut at the top and the seat belt
at the front, in addition to forming the
terminating side section of the roof frame.
The large upper and lower castings are
interlinked by way of two straight extruded
sections and form the framework for the air
suspension strut holder.
SSP282_033
The sill panel/longitudinal member
connecting element is the largest casting. It
supports the entire rear sub-frame and links
the rear longitudinal member to the sill panel.
Its great rigidity is designed to protect the
tank in between in the event of a rear-end
collision.
Large upper castings
Extruded sections
Large lower castings

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Body
A standard feature is an automatic closing
aid, which is actuated by a Bowden cable
separately from the catch. After the latch has
closed, a mechanism pulls the catch
downwards, overcoming the build-up of
pressure occurring. On locking, a microswitch
in the boot lid lock transmits a signal to the
control unit to activate the automatic closing
aid.
SSP282_035
The drive unit is only encased in foam and
inserted between side panel and battery. Boot lid
Electronic boot lid lock
with microswitch Foam encasing
Motor for automatic
closing aidCatch Bowden
cable

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In the event of manual boot lid actuation, the
electric motor is disconnected by way of a
magnetic coupling, thus permitting the boot
lid to be moved by hand. On closing the boot
lid, the drive is deactivated via a microswitch
at the latch and the automatic closing aid
activated. Pressing the button in the driver's door or on
the boot lid, or remote control actuation,
effects release and motor-driven opening of
the boot lid. Automatic boot lid closing can
only be implemented by way of the boot lid
button.
An electric motor flanged directly to the
swivel joint of the right boot lid hinge opens
or closes the boot lid.
SSP282_036
Automatic boot lid
As a general rule, interruption of automatic
actuation always causes the boot lid to be
disconnected from the drive unit and thus
set to manual mode.
Hinge mechanism
(open)
Boot lid
control unit J605
Button in driver's door Button on boot lid Vehicle key

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Body
Front doors
The doors are made up of a combination of
aluminium panels, aluminium sections and
aluminium castings.
Optimised rib geometry and wall thickness in
the hinge and lock mounting castings formed
the basis for ideal implementation of the
lightweight construction concept.
Rear doors
Large, high-strength side impact members
are integrated into the door to provide even
load distribution in the event of side impact.
SSP282_039
Door shell and door frame are connected at
the door pre-assembly stage by means of
fitted bolts to ensure the accurate
assignment of both components. Window
lifter frame, window lifter motor/gear
mechanism, door control unit and speaker
are pre-assembled on a base plate and bolted
to the door subframe.

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Seats
A new seat concept was developed for the
Audi A8 ´03.
The basic seat features the following
standard functions:
– Electric seat length, height and angle
adjustment
– Electric backrest angle adjustment
– Front crash-active head restraints (refer to
Page 21)
The basic seat can additionally be fitted with
– Four-way lumbar support
– Seat memory for driver and front
passenger
– Electrically adjustable head restraints
– Electric belt height adjustersExtra features of sports and comfort seats:
– Electric top 1/3 backrest adjustment
– Electric seat depth adjustment
Optional extras for comfort seat:
– Climate function (refer to Page 85)
– and/or massage function
The massage function is implemented by way
of rhythmic action of the electromechanical
lumbar support, thus massaging and relaxing
the back muscles.
The fixed rear seat bench versions correspond
to those of the front seats, with the third head
restraint being fully retractable. Electric
individual seats are however only available as
"Basic" and "Comfort" versions.
SSP282_116
Crash-active, electronic
head restraint with 70 mm height
adjustment
Thorax/pelvis
side airbag
Backrest fan
Seat cushion fan Electric seat depth adjustment – As the
structure moves forwards it pulls the
padding with it and so extends the seat
area by 50 mm. Backrest adjustment –
The angle of the top
1/3 of the
backrest can be adjusted by 15°
for enhanced shoulder comfort.
Lumbar support with massage
function over a length of 60 mm

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G 256 N251G179G180
N153
K145
AIRBAGOFF
N95/G85
N202
N154
N252
G 257
J533
N199
N201
G 283G 284
N131
N200
T16J623
J285/K75
E224
AUSEIN
AIRBAG
J655
E24 E25
J234
N196N198N197
J393
J526
System layout
Passenger Protection
SSP282_068

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The wide range of sensors permits detection
not only of head-on collision and side impact,
but also of rear-end collisions. Use is made in the Audi A8 ´03 of the 8.4E+
airbag system with the aim of attaining greater
occupant safety whilst reducing the impact.
This was achieved, for example, by way of two-
stage front airbag triggering, active front head
restraints and a battery cut-off element.
K75 Airbag warning lamp
K145 Airbag disabled warning lamp,
front passenger side
N95 Driver side airbag igniter
N131 Airbag igniter 1, front passenger side
N153 Belt tensioner igniter 1, driver side
N154 Belt tensioner igniter 2,
front passenger side
N196 Rear belt tensioner igniter,
driver side
N197 Rear belt tensioner igniter,
front passenger side
N198 Rear belt tensioner igniter,
centre
N199 Side airbag igniter, driver side
N200 Side airbag igniter,
front passenger side
N201 Rear side airbag igniter,
driver side
N202 Rear side airbag igniter,
front passenger side
N251 Curtain airbag igniter, driver side
N252 Curtain airbag igniter,
front passenger side
T16 16-pin connector
(diagnostic connection) Key
E24 Driver side belt switch
E25 Front passenger side belt switch
E224 Airbag disabling key switch,
front passenger side
G85 Steering angle sender
G179 Side airbag crash sensor,
driver side (B-pillar)
G180 Side airbag crash sensor,
front passenger side (B-pillar)
G256 Rear side airbag crash sensor,
driver side
G257 Rear side airbag crash sensor,
front passenger side
G283 Front airbag crash sensor,
driver side
G284 Front airbag crash sensor,
front passenger side
J234 Airbag control unit
J285 Control unit with display
in dash panel insert
J393 Convenience system central
control unit
J526 Telephone/telematics control unit
J533 Data bus diagnostic interface
(gateway)
J623 Engine control unit
J655 Battery cut-off relay

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15
J234
J655
1
2
E224
3
G283G284G179
N131
F138
N202N199N200N201N95
Key
E24 Driver side belt switch
E25 Front passenger side belt switch
E224 Airbag disabling key switch,
front passenger side
F138 Airbag coil connector/return spring
with slip ring
G179 Side airbag crash sensor,
driver side
G180 Side airbag crash sensor,
front passenger side
G256 Rear side airbag crash sensor,
driver side
G257 Rear side airbag crash sensor,
front passenger side
G283 Front airbag crash sensor,
driver side
G284 Front airbag crash sensor,
front passenger side
Block diagram
Passenger Protection
J234 Airbag control unit
J655 Battery cut-off relay
N95 Driver side airbag igniter
N131 Airbag igniter 1, front passenger side
N153 Belt tensioner igniter 1, driver side
N154 Belt tensioner igniter 2,
front passenger side
N196 Rear belt tensioner igniter, driver side
N197 Rear belt tensioner igniter,
front passenger side
N198 Rear belt tensioner igniter, centre
N199 Side airbag igniter, driver side
N200 Side airbag igniter,
front passenger side
N201 Rear side airbag igniter,
driver side
N202 Rear side airbag igniter,
front passenger side