Zero-Position Sensor

The zero-position sensor records the zero position of the positioner module for the adaptive headlights as follows: If the positioner module drives past the zero-position sensor, the zero-position sensor signals a level change (between high and low).

The zero-position sensor is crucial for the operation of the positioner modules:

• When the vehicle is parked, the headlights drive to parked position (for terminal 15 OFF).
• Before the vehicle is driven, the headlights always perform a calibration sequence. During the calibration sequence, the headlights are moved from the parked position past the zero-position sensor and into the straight-ahead position.
• The zero-position sensor fails, the position of the headlights is determined via a mechanical reference point as follows: The positioner module moves as far as the permitted mechanical end stop and then into the straight-ahead position. The adaptive headlights function is then deactivated. The indicator lamp on the light switch (light switch cluster on the E46) flashes.