j518% AUDI A6 2005 C5 / 2.G Electrics System Training Manual

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Immobiliser 4
Convenience electrics
The immobiliser 4 technology is used in the
Audi A6 ’05.
This means that all components must be "taught"
online, as is already the case with the Audi A8 ´03
and the Audi A3 ´04.
The following components are integrated into the
immobiliser:
– The control unit for access and
start authorisation
– The engine control unit
– The vehicle keysControl unit, which is not integrated into the
immobiliser
Control unit, which is integrated into the
immobiliser
Master control unit
PC/mainframe
326_099
Immobiliser and component protection
E415 J518
J533 J623

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Internal structure
The pivot angle is monitored by an inductive pickup
in the pivot module. The pickup value is evaluated
immediately in the relevant power module for
headlights as a pulse width-modulated signal.
If the motor or pickup does not function, the power
module sends an error message to the control unit
for headlight range control J431.
This is communicated to the driver in a display in
dash panel insert J285.
The same lamps that are used in the bi-xenon
headlight are also used in the adaptive light
headlight.
CAN Communication
The values marked with (*) are used as input
variables in calculating the pivot angle.
All other input variables are only needed for
dynamic headlight range control.
326_079 Data bus diagnosis
interface J533 Co n t ro l u n it fo r h e a d li g h t ra n g e c o n t ro l
J431
Steering-angle sensor G85
Steering wheel angle*
Steering wheel angle speed*
Control unit for ABS with EDL J104
Wheel speeds*
Directions of travel*
Brake light switch signal
Yawing speed*
Brake pressureControl unit for on-board power supply
J519
Dipped beam on*
Control unit for access and
start authorisation J518
Te r m i n a l X
Te r m i n a l 5 0
Gas discharge light L13/L14
326_135
Control motor for dynamic
cornering light V318/V319
Magnet for headlight cover adjustment
N395/N396Sensor for pivot module
position G474/G475

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326_119
Input and output signals
The parking aid control unit J446 requires CAN bus
messages from various control units.
4-channel system control units:
Convenience electrics
Control unit for on-board power
supply J519
Reversing light on
Control unit for trailer detection J345
Tr a i l e r d e t e c t e dData bus diagnosis
interface J533
Parking aid control unit J446
Warning buzzer for rear parking aid
H15
Warning signal
Control unit for access and
start authorisation J518
Terminal 15 CAN, key number
Control unit for ABS with EDL J104
Speed
Control unit for autom. gearbox J217
Selector lever position
Control unit for on-board power
supply J519
Reversing light on
Control unit for trailer detection J345
Tr a i l e r d e t e c t e dData bus diagnosis
interface J533Warning buzzer for front parking aid
H22
Warning signal
Parking aid control unit J446
Warning buzzer for rear parking aid
H15
Warning signal
326_083 Control unit for access and
start authorisation J518
Terminal 15 CAN, key number
Reference
For further information on the parking
aid control unit J446, please refer to the
SSP 312, Audi A3 ’04 – Electrics.
8-channel system control units: