Functional Description

Functional Description
The E38/E39 system comes on-line when the lights are switched on.

The LWR control electronics then cycles the stepper motors through their full range of motion and stops at a default position.

The control electronics monitors the level sensor input signals to determine the vehicles load angle and adjusts the beam position accordingly. As the vehicle is driven it continually monitors the level sensor signals and if necessary updates the headlight beam positions every 25 seconds on the E46 or momentarily on the E38/E39 system.

Abrupt fluctuations of the sensor signals are filtered to prevent unnecessary adjustment as well as monitoring road speed and brake pedal application as correction factors.

HEADLIGHT ALIGNMENT
The procedure for aligning Xenon Headlights with LWR is the same as conventional halogen bulb systems with one additional step. Wait at least 30 seconds for the LWR to cycle and adjust to it's calculated position.

LWR DIAGNOSIS
The LWR control module of the E38/E39 is diagnosable using the DIS/MoDiC. The headlights must be switched on in order to start diagnosis,

The E46 LSZ incorporates LWR diagnosis program.