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 Headlight Adjustment Module

Courtesy of BMW OF NORTH AMERICA, INC.

Fig 2: Front DHL Sensor

Courtesy of BMW OF NORTH AMERICA, INC.

Fig 3: Rear DHL Sensor

Courtesy of BMW OF NORTH AMERICA, INC.

Fig 4: Identifying Headlight Adjusting Range

Courtesy of BMW OF NORTH AMERICA, INC.