GF82.10-P-1001TY Headlamp Range Adjustment (LWR) Headlamp, Function

GF82.10-P-1001TY Headlamp Range Adjustment (LWR) Headlamp, Function
- except CODE (615) Bi-xenon headlamp unit with integrated cornering lamps

Function requirements
^ Circ. 15 ON
^ Low beam ON

Function
The headlamp range adjustment (HRA) is prescribed by law to prevent xenon headlamps dazzling oncoming traffic. The HRA automatically maintains the inclination angle of the headlamps within the legally defined limits regardless of the vehicle load.

Headlamp range changes, which are brought about by acceleration or deceleration, are also regulated.

On vehicles without code (489) Airmatic (semi-active air suspension) the data of the front axle level sensor (B22/2) and the rear axle level sensor (B22/3) are read in directly by the headlamp range adjustment control unit (N71).

On vehicles with CODE (489) Airmatic (semi-active air suspension) the data of the left front level sensor (B22/8), the right front level sensor (B22/9) and the rear axle level sensor are read in by the AIRmatic with ADS control unit (N51) and forwarded via Controller Area Network bus class C (engine compartment) (CAN-C) to the headlamp range adjustment control unit.

The headlamp range adjustment control unit forwards the evaluated data over the HRA bus to the driver-side SAM control unit with fuse and relay module (N10/1). The HRA power module (E1n3) at the left front lamp unit (E1) actuates the left headlamp range adjustment motor (E1m1). The HRA power module (E2n3) at the right front lamp unit (E2) actuates the right headlamp range adjustment motor (E2m1). The corresponding position of the headlamp range adjustment motors is monitored via internal potentiometers.