A8 Quattro Sedan V8-4.2L (BVJ) (2008)
Ride Height Sensor: Service and Repair
Front Level Control System Sensor
Level Control System
Front Level Control System Sensor
General Information
Vehicles with level control and/or gas discharge lamps have standard automatic head lamp range control.
To function properly, the level control and automatic head lamp range control system need information about compression travel or rebound travel in
the front and rear suspensions.
The position of the lower left control arm relative to the body is transferred to the left front vehicle level control system sensor (G78) via a coupling
rod. This transmits electrical signals to the high intensity gas discharge lamp control module (J343/344).
At the rear suspension, these signals from left rear level control system sensor (G76) and right rear level control system sensor (G77) are transmitted
to the left/right high intensity gas discharge lamp control module.
These signals are required for determining vehicle level.
The automatic headlight range control reacts independently to changes in vehicle level.
The vehicle level can change in the following situations:
‹› Trailer mode
‹› Different load conditions; vehicle empty, vehicle partially or fully loaded
CAUTION!
Head lamp and level control setting!
The control position must be adapted and the head lamp basic setting much be checked if:
‹› The trailing arm has been removed and reinstalled or replaced,
‹› Installation work has been performed on the level control system sensor,
‹› The level control system sensor has been replaced,
‹› The threaded connection for the level control system sensor coupling rod was loosened at the trailing arm.
Readapt the control position. Refer to => [ Control Position, Programming ] See: Suspension Control ( Automatic - Electronic )/Description and
Operation/Level Control System.
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If the control position was reprogrammed on vehicles with lane assist, the directional stabilization assistance control module (J759) must be
calibrated. Refer to => [ Lane Assist Calibration ] See: Alignment/Service and Repair/Procedures/Lane Assist Calibration.
Removing
Note that there are different versions with a "long" or "short" lever.
Only use the same version of the sensor. Do not install both versions together.
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Disconnect the electrical connector - 1 -.