Headlamp Range Adjustment (Vehicles w/Xenon Headlamps)

Component Identification:

Electric headlamp range adjustment (for xenon headlamps)
The electric headlamp range adjustment operates dynamically. Each change in the vehicle level is registered by the rear and front axle sensors (A51, A52) and reported to the headlamp range adjustment control module (N71). The control module (N71) compares the vehicle level with the headlamp adjustment. If necessary the headlamp adjustment is corrected by the control module (N71) via the headlamp range adjustment motor (E1m1, E2m2). The headlamp range is adjusted only when a change in the vehicle level is reported by the rear and front axle sensors (A51, A52) to the control module (N71) for a certain period of time.

Headlamp range adjustment control module (N71)
The control module (N71) is located below the rear seat. It processes the signals from the front and rear axle sensors (A51, A52) and the position of the headlamp range adjustment motors (E1m1, E2m1). After evaluation of the signals it sends corresponding commands to the headlamp range adjustment motors (E1m1, E2m1).

Front and rear axle sensors (A51, A52)
One sensor each is attached to the front and rear axle torsion bar. These sensors (A51, A52) send a signal to the control module (N71) depending on the vehicle level.

Headlamp range adjustment motors (E1m1, E2m1)
A potentiometer on the motor signals the position of the reflectors to the control module (N71). The motors (E1m1, E2m1) receive a command from the control module (N71) for correction of the headlamp range.