Level Control System Sensor, Removing and Installing

Rear Level Control System Sensor, Removing and Installing 

General Information 

Vehicles with level control and/or gas discharge lamps have standard automatic headlamp range control → 94 - LIGHTS, SWITCHES - EXTERIOR .

To function properly, the level control and automatic headlamp range control system need information about compression travel or rebound travel at the front and rear axles.

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.

Left/Right High-intensity Gas Discharge Lamp Control Module J343/344 , servicing → 94 - LIGHTS, SWITCHES - EXTERIOR .

At the rear axle, 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 J343/344.

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

The control position must be adapted and the headlamp basic setting much be checked if:

• Track control arm has been removed and reinstalled or replaced,
• Installation work has been performed on the level control system sensor,
• Level control system sensor has been replaced,
• Threaded connection for coupling rod of level control system sensor was loosened at track control arm.

Re-adapt control position → Control Position, Programming .

Headlamp basic setting. Standard → HALOGEN HEADLAMPS or HID → HID HEADLAMPS .

Removing 

• Separate connector - 2  -.
• Remove coupling rod hex bolt - 4  -.
• Remove nuts - 1  -.
• Remove level control system sensor - 3  -.

Installing 

Installation is in reverse order of removal. Observe the following when doing so:

The sensor lever must point forward.

• Tighten new nuts - 1  - to 10 Nm.
• Tighten hex bolt - 4  - on coupling rod - 3  - to 10 Nm.
• Re-adapt control position → Control Position, Programming .
• Perform headlamp basic setting. Standard → HALOGEN HEADLAMPS or HID → HID HEADLAMPS