Front Suspension

Vehicle Level Sensor in Vehicles with Automatic Headlamp Vertical Aim Control

Vehicles with gas discharge lamps have an automatic headlamp range control system as standard equipment.

To function properly, the automatic vertical aim control system needs information about compression travel or rebound travel at the front and rear axles.

For this, the position of the lower left control arm relative to the body is transferred to the Left Front Level Control System Sensor (G78) via a coupling rod. This transmits electrical signals to the headlight range control module (J431).

Headlamp Range Control Module (J431).

On the rear axle, the signals are transmitted to the Headlamp Range Control Module (J431) from the Left Rear Level Control System Sensor (G76).

These signals are required for determining vehicle level.

The automatic headlamp 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

• Slow or fast driving habit

CAUTION!
Adjustment of headlamps!

It is always necessary to check basic setting of headlamps whenever:

• The track control 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 retaining clip for the coupling rod on the track control link has been loosened.

Headlamp basic setting. Refer to => Lighting and Horns Lighting and Horns