Vehicles with automatic headlight vertical aim control, vehicle level sensor

Vehicles with gas discharge headlights come standard with automatic headlight range control. →

• 94 LIGHTS, SWITCHES - EXTERIOR
• 94 LIGHTS, SWITCHES - EXTERIOR for ELECTRICAL EQUIPMENT, CABRIOLET

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 link relative to the body is transferred to Left Front Level Control System Sensor G78 via a coupling rod. This transmits electrical signals to the Headlamp Range Control Module J431.

Headlamp Range Control Module J431 →

• 94 LIGHTS, SWITCHES - EXTERIOR
• 94 LIGHTS, SWITCHES - EXTERIOR for ELECTRICAL EQUIPMENT, CABRIOLET

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

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:

• Towing a trailer
• Different load conditions; vehicle empty, vehicle partially or fully loaded
• Slow or fast driving habit

Checking the headlight basic setting is necessary when:

• The track control link has been removed and reinstalled or replaced,
• Assembly work was performed on level control system sensor,
• The level control system sensor was replaced,
• The retaining clip for the coupling rod on track control link has been loosened.

Headlight basic setting →

• 94 LIGHTS, SWITCHES - EXTERIOR
• 94 LIGHTS, SWITCHES - EXTERIOR for ELECTRICAL EQUIPMENT, CABRIOLET