GF82.10-P-1001QQ Headlamp Range Adjustment (HRA) Headlamp Function

GF82.10-P-1001QQ Headlamp Range Adjustment (HRA) Headlamp Function
- up to 30.11.04
- with CODE (614) Bi-xenon headlamp unit

Component Identification:

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

Function requirements:
^ Circuit 15 ON
^ Rotary light switch (S1s1) in "Driving lamps ON" position
^ Rotary light switch (S1s1) in "AUTO" position and the rain/ light sensor (B38/2) has detected "Night"
^ In the instrument cluster (A1), daytime running lamps are active

Function
The data from the headlamp range adjustment rear axle sensor (A51) and headlamp range adjustment front axle sensor (A52) are read in by the xenon headlamp control unit (E2n1). The data for the adjustment request are then transferred to the xenon headlamp control unit (E1n1).

The xenon headlamp control unit (E2n1) actuates the right headlamp range adjustment motor (E2m1) and the xenon headlamp control unit (E1n1) actuates the left headlamp range adjustment motor (E1m1). The headlamp range adjustment motors feed their relevant positions back to the control units via internal potentiometers. By evaluating the wheel speed signals, the xenon headlamp control unit (E2n1) recognizes whether the vehicle is traveling at a constant speed, is accelerating or being braked. These data are then transmitted to the xenon headlamp control unit (E1n1).

At a constant vehicle speed, the electric headlamp range adjustment operates in "static mode" with a low motor adjustment rate. If, however, positive or negative vehicle acceleration is occurring, the change is performed in "dynamic mode" at a high rate of adjustment.