Rear Suspension

Level Control System Sensor

General Information

Vehicles with electronically controlled damping and/or HID headlamps have standard automatic headlamp range control.

To function properly, the electronic damping and automatic headlamp range control need information about compression travel or rebound travel at the front and rear suspensions.

For this, the position of the left/right trapezium arm in relation to the body is transferred via a coupling rod to Left Rear Level Control System Sensor (G76) and Right Rear Level Control System Sensor (G77). These transmit electrical signals to the Electronic Damping Control Module (J250) and/or Left/Right High-intensity Gas Discharge Lamp Control Module (J343/344).

At the front axle, these signals are transmitted from the Left Front Level Control System Sensor (G78) and Right Front Level Control Sensor (G289) to the Electronic Damping Control Module (J250) and/or the left/right high-intensity gas discharge lamp control module.

These signals are required for determining vehicle level.

The headlamp range control responds automatically to changes in the vehicle level.

The vehicle level can change in the following situations:

• Trailer Mode

• Different load conditions; vehicle empty, vehicle partially or fully loaded

• Always program the control position and check the headlamp adjustment on vehicles with electronic damping if:

• The lower transverse link has been removed and reinstalled or replaced.

• The upper transverse link was removed and installed or replaced.

• The subframe was replaced.

• Installation work has been performed on the level control system sensor.

• The level control system sensor has been replaced.

• The coil springs were replaced.

• The level control system sensor coupling rod threaded connection was loosened at the lower transverse link.

If the vehicle has electronically controlled damping, then the control position must be programmed. Refer to => [ Control Position, Programming using Vehicle Diagnostic Tester ] Testing and Inspection.

If the control position was reprogrammed on vehicles with lane assist, the directional stabilization assistance control module (J759) must be recalibrated. Refer to => [ Lane Assist Calibration Procedure ] Lane Assist Calibration Procedure.

Replacing Level Control System Sensor with Subframe Installed

- Remove the wheel.

- Disconnect the harness connector - 2 -.






- Remove bolt - 1 -.

- Remove screws - 3 - with angled wrench. Do not bend upper retaining plate when doing so.

- Remove level control system sensor.

• Only sensors of the same version may be installed.

- Adapt replacement part accordingly and install.

- Install the bolts - 3 - using an angled wrench. Do not bend upper retaining plate when doing so.






• Hold level control system sensor securely when tightening bolt - 3 -.

Sensor lever must point outward.

- Install the bolt - 1 -.






- Connect the connector - 2 -.

Tightening specifications, refer to => [ Upper Transverse Link, Tie Rod, Coil Spring, Lower Control Arm and Level Control System Sensor Overview ] Upper Transverse Link, Tie Rod, Coil Spring, Lower Control Arm and Level Control System Sensor Overview.

- If the sensor was removed and installed on a vehicle with electronically controlled damping or if the linkage was loosened, the control position must be reprogrammed. Refer to => [ Control Position, Programming using Vehicle Diagnostic Tester ] Testing and Inspection.

- If the control position was reprogrammed on vehicles with lane assist, the directional stabilization assistance control module (J759) must be recalibrated. Refer to => [ Lane Assist Calibration Procedure ] Lane Assist Calibration Procedure.