Deactivation of adaptive headlight movements in response to system faults

The green indicator light on the light switch cluster flashes if a system fault is present.

Dazzling of oncoming traffic must be prevented in the event of a system fault.

To this end, the swivelling movement of the adaptive headlights is deactivated as follows:

• If the stepper motors are still functional, the headlights are returned to the straight-ahead position. The headlights are no longer swivelled towards bends in the road.
• If it is no longer possible for a headlight to be moved back to the straight-ahead position, the headlight is tilted downwards (by the stepped motors for automatic headlight-range adjustment). This prevents dazzling of oncoming traffic.
• If the headlight cannot be tilted downwards, the bi-xenon bulb in this headlight is disabled as follows:

  When the vehicle is parked, idle status (sleep mode) is detected by the AHL control unit (vehicle stationary and terminal R OFF for several minutes).

  The bi-xenon bulb in the defective headlight is not switched on when the engine is restarted.

  The front fog lights are switched on in order to ensure a minimum level of illumination.

  The dipped beam headlights are not switched off while the vehicle is in motion.