BMW F10 F20 F21 F30 LCI Headlight Control Level Sensor Module 6788571

Visual condition of the part

The product shows signs of use visible in the photos.

BMW F10 F20 F21 F30 LCI Headlight Control Level Sensor Module is a precision lighting system component responsible for automatically adjusting the headlight beam height based on the vehicle's load. Thanks to this sensor, your BMW's headlight system maintains a stable beam angle, improving visibility and reducing glare for other road users. This solution is particularly important in modern lighting installations, where operational repeatability and compliance with factory standards are essential.

Specifications and technical data

• SKU: 6788571
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 6870000
• Substitutable numbers: 37146870000, 6870000, 37146860843, 6860843, 37146784072, 6784072, 37146788569, 6788569, 37146788571, 6788571
• Category: Centre & Third Brake Light Assemblies

Purpose and function in the BMW lighting system

The headlight level sensor works in conjunction with the suspension system and the headlight control unit, transmitting information about the current position of the chassis relative to the axles. Based on this, the system adjusts the headlight setting to maintain the correct road illumination geometry. This is particularly important in vehicles equipped with advanced headlights, where a stable cut-off line and proper road illumination have a direct impact on driving safety.

The component is dedicated to selected BMW F-series models, which ensures proper structural fit and electrical compatibility with the vehicle's factory system. Using a component that complies with the original specification allows for proper interaction with control modules and axle sensors.

Construction and performance parameters

The presented sensor belongs to the group of components mounted near the suspension, where it is exposed to variable operating conditions. The housing and operating mechanism are designed to maintain adequate resistance to vibrations, moisture, and contaminants typical of the chassis. As a result, the sensor can stably transmit the chassis position signal to the lighting control system.

The precise operating characteristics of the sensor are significant for the smooth operation of automatic leveling – a properly functioning component minimizes the risk of diagnostic errors, headlight failure warnings, and incorrect headlight alignment. Using a part from the same design group as the factory one allows for maintaining the correct electrical and mechanical parameters.

Condition, fitment, and installation

The offered sensor is a used part, which in practice means it has been removed from a vehicle and verified for further use. This solution allows for an economical repair of the headlight leveling system while maintaining compliance with BMW's factory specifications. Proper fitment for a specific vehicle version should be confirmed based on technical data and manufacturer markings.

In most cases, installing the sensor involves correctly seating it in the bracket and connecting the electrical connector, while maintaining proper wiring harness routing. After installation, it is recommended to perform an adaptation or calibration procedure for the lighting system in accordance with the vehicle manufacturer's guidelines to fully utilize the automatic leveling capabilities.

Benefits of using a dedicated leveling sensor

Using a sensor designed for specific BMW F-series models allows for maintaining the consistency of the entire lighting system. The main advantages include:

• maintaining the correct headlight beam angle under variable vehicle loads,
• reducing the risk of dazzling oncoming drivers,
• stable cooperation with factory control units and electrical installation,
• the ability to restore full system functionality after a failure or damage to the original sensor.

Restoring the efficiency of the leveling system is important not only for night driving comfort but also for meeting technical inspection requirements, where headlight alignment and the correct operation of automatic systems are checked.

Related BMW lighting system components

If you are planning a comprehensive repair or upgrade of the rear lighting zone in your BMW and need other components from the same group, such as brake lights, control modules, or power harnesses, check the available parts in the BMW main and center brake lights category.

If you want to better understand the relationships between sensors, drivetrain components, and other parts working with vehicle electronics, the guide on selecting and assessing the condition of used components may be helpful – you can find it in the article Second-hand differential – what you need to know about used differentials, sensors, and drivetrain systems.