Dynamic Headlight Adjustment (DHL - Xenon Only)

Cars equipped with Xenon headlights require automatic headlight aim control; this necessitates a separate control module to carry out automatic adjustment of the headlights.

With automatic headlight levelling, the load status and its changes are recorded by means of two height level sensors (potentiometers) located at the front and rear axles. The information from these sensors is communicated back to the DHL module.

Each headlight has electrically driven linear stepper motors, which are connected to the headlamp inserts in such a way that their movement changes the range of the headlamp.

Fig 1: DHL Head Light Adjustment Module

Courtesy of BMW OF NORTH AMERICA, INC.

Fig 2: Headlight Adjustments Components

Courtesy of BMW OF NORTH AMERICA, INC.

Fig 3: Front DHL Sensor

Courtesy of BMW OF NORTH AMERICA, INC.

Fig 4: Rear DHL Sensor

Courtesy of BMW OF NORTH AMERICA, INC.

Workshop Hint 

Headlamp Adjustments are performed using special tool #63 2 100.

Fit tool to the adjustment screw (1) and lock tool to adjustment screw by sliding (2) in direction shown.

Close hood, ensuring the service tool is routed correctly between the hood and wheel arch liner.