Rain Sensor BMW F20 F21 F30 F31 Windscreen Light Solar Condensation Unit 9861558

BMW F20 F30 F31 Light and Rain Sensor 9861558 is a component from the Electronic Control Units and Controllers category, responsible for automatic control of lighting and wipers in selected BMW F-series models. The original OEM design ensures proper integration with the factory electrical system, and the used nature of the part allows for an economical yet functional repair of the comfort system.

Specifications and technical data

• SKU: 9861558-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 9861558
• Substitutable numbers: 9861558, 61359861558, 9475147, 61359475147, 7939173, 61357939173, 6823541, 61356823541, 6806745, 61356806745, 9321007, 61359321007, 9347396, 61359347396, 9387624, 61359387624, 9332180, 61359332180, 9388381, 61359388381, 6819590, 61356819590, 9354844, 61359354844, 9354226, KD
• Category: ECUs & Computer Modules

Sensor Purpose and Function

The light and rain sensor is mounted on the windshield and works with body control modules, responsible for:

• automatic headlight activation when external light intensity decreases,
• wiper operation adjustment based on rainfall intensity,
• increased driving comfort in varying weather conditions,
• maintaining the consistent operation of comfort systems according to BMW's factory logic.

Thanks to this module, the driver can utilize the automatic light and wiper mode, relieving them of the need to manually react to changing road conditions.

Benefits of Using an Original BMW Module

As a component within the Electronic Control Units and Controllers group, this sensor is designed to operate within BMW's specific software environment. Using an original module allows for:

• maintaining full compatibility with the vehicle's electrical system and communication bus,
• proper cooperation with factory settings of comfort and safety systems,
• stable operation of automatic functions without errors in the controller memory,
• avoiding problems typical of aftermarket replacements with uncertain parameters.

For users who value maintaining the precision of BMW systems, choosing an original light and rain sensor is a technically sound solution.

Condition, Verification, and Compatibility

The offered sensor is a used part, sourced from disassembly, which allows for a cost-effective restoration of system functionality. Before being offered, such modules are routinely verified for correct operation in the donor vehicle or on a test bench, minimizing the risk of post-installation issues.

To select the correct sensor for a specific BMW F20, F30, or F31 model, it is crucial to compare the OEM part number and available interchangeable numbers with the vehicle's specifications. If necessary, manufacturer markings and data from BMW catalogs can also be used to confirm the module's compatibility with the car's year and equipment version.

Importance for Safety and Driving Comfort

A functional light and rain sensor contributes not only to convenience but also to driving safety. Automatic headlight activation improves vehicle visibility in challenging conditions, and properly controlled wipers help maintain windshield clarity without driver reaction delays. In BMW-class vehicles, where significant emphasis is placed on ergonomics and system consistency, a correctly chosen module of this type is an essential element of the entire electronic system.

Other BMW Electronic Control Units and Controllers

If you are also looking for other BMW Electronic Control Units and Controllers for your car, check out our dedicated category: BMW Electronic Control Units and Controllers. There you will find a wide selection of original components that will help maintain the consistent operation of your car's electrical system.

Knowledge and Advice on Original Modules

When selecting used electronic components, it is advisable to consult reliable sources of information. If you are interested in how original modules and components influence the character of premium cars, read the article on our blog: How Used Original Parts Help Maintain Audi's Brand DNA. Although the text concerns a different brand, it effectively illustrates the importance of using factory components in premium segment vehicles.