8383551 BMW E39 E38 Headlight Range Control Module LWR – OEM Used & Tested

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This BMW headlight range control module (LWR) is a genuine OEM electronic component for the BMW E39 5 Series and E38 7 Series. Primary OEM number 8383551. It is designed to control the automatic headlight leveling system, driving the adjustment motors in the headlight units so the beam height stays correct whatever the load or the attitude of the vehicle.

Its job is to evaluate the signals of the level sensors and set the beam position of the headlights accordingly, raising or lowering the light pattern when the rear of the car is loaded or when braking and accelerating change its attitude. A properly working headlight range control module supports good road illumination, prevents glare for oncoming traffic, and ensures correct operation of the entire headlight leveling system.

Common signs of a faulty unit include headlights that point too high or too low, a beam that does not change when the load changes, headlight adjustment motors that do not move, glare complaints from other drivers, poor visibility at night, and fault indications in the lighting system. When the module cannot drive the motors correctly, the headlights may stay fixed in one position and no longer follow the vehicle attitude.

This is a used original part, removed from a vehicle and tested before sale. Match the exact OEM number 8383551 before ordering. Professional installation is recommended, and a basic headlight alignment check or adaptation with a diagnostic tool may be required where applicable, so confirm the fitment details for your vehicle before you buy.