BMW F20 F21 F22 F23 F30 F31 F32 F87 Rain And Light Sensor 9861559

BMW F20 F21 F22 F23 F30 F31 F32 F87 Rain And Light Sensor is a high-precision electronic component responsible for the automatic control of wipers and front lighting. This component from the Engine sensors and switches group works with the vehicle's electrical system, improving driving comfort and road visibility in changing weather conditions.

Specifications and technical data

• SKU: 9861559
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 9861559
• Substitutable numbers: 9861559, 61359861559, 9475148, 61359475148, 9496243, 6806746, 61356806746
• Location on the vehicle: Front
• Category: Engine Sensors & Switches

Purpose and function of the sensor

The offered rain and light sensor is designed for installation in the front area of BMW F-series vehicles, such as the F20, F21, F22, F23, F30, F31, F32, and F87. Its task is to continuously measure the intensity of precipitation on the windshield and the level of ambient light, which allows the vehicle's control units to automatically activate the wipers and lights.

As a result, the driver gains stable electronic support in daily operation, reducing the need for manual switching of operating modes. A properly functioning sensor contributes to driving safety after dark, in the rain, and during sudden changes in brightness, e.g., when entering a tunnel.

Construction and integration with BMW systems

The sensor works with factory BMW control modules, utilizing dedicated vehicle software. It is mounted in the windshield area, in the rearview mirror zone, which ensures optimal measurement conditions for both rain and light functions.

This element is designed as an OEM-class electronic component, meaning its geometry, mounting method, and connectors are matched to the factory wiring harness. This enables seamless integration with the existing electrical architecture without the need for modifications.

Condition, origin, and service application

The presented sensor is a used part, sourced from a dismantled BMW vehicle. Such components are frequently used in professional workshops and by knowledgeable users because they allow for maintaining compliance with factory specifications while optimizing repair costs.

Replacing the rain and light sensor is recommended in situations where symptoms such as improper operation of automatic wipers, lack of reaction to changes in light intensity, or errors stored in the control unit memory occur. Using an original component from the same BMW model group helps restore stable operation of automatic functions without interfering with the software beyond standard adaptation.

Benefits of installing an original BMW sensor

Choosing a rain and light sensor dedicated to specific BMW F-series models provides a number of practical benefits:

• maintaining full compatibility with factory control modules and the electrical system,
• proper cooperation with the automatic headlight activation system and wiper operating mode,
• consistency of operating parameters with other elements of the vehicle's electronic system,
• the ability to use existing BMW diagnostic and service procedures.

For the user, this means more predictable vehicle behavior in the rain and after dark, as well as comfortable operation without the need for constant adjustment of settings.

Integration with electronics and service knowledge

Modern BMW 3 and 5 series models, as well as structurally similar F-series, use extensive electronic systems, including modules responsible for lighting, comfort, and multimedia. A proper understanding of their cooperation with sensors, such as the rain and light sensor, facilitates diagnostics and the selection of parts from dismantling. Extended information on the operation of iDrive modules, FRM controllers, and other comfort electronics can be found in the article Driving pleasure for years – how to take care of iDrive systems and electronic modules in BMW 3 and 5 series models using parts from dismantling?, which helps to better plan repairs and upgrades.

If you are planning a comprehensive repair or upgrade of the engine area and control electronics in your BMW and need other elements from the same group, such as position sensors, switches, or additional sensors, check the available parts in the BMW engine sensors and switches category.