BMW F20 F21 LCI F22 F40 Front Windscreen Window Rain Sensor 9873610

BMW F20 F21 LCI F22 F40 Front Windscreen Window Rain Sensor is a precision component of the wiper system, responsible for automatically adjusting wiper blade operation to the intensity of rainfall on the windshield. Thanks to this, the wiper system reacts smoothly and predictably, improving driving comfort and safety in changing weather conditions. This solution is particularly valued in modern BMW models, where stable electronic performance and seamless integration with other vehicle systems are essential.

Specifications and technical data

• SKU: 9873610
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 6832975
• Substitutable numbers: 61355A61845, 5A61845, 61355A70A02, 5A70A02, 61355B4A6B3, 5B4A6B3, 61356832975, 6832975, 61359387624, 9387624, 61359354844, 9354844, 61359354226, 9354226, 9287976
• Location on the vehicle: Front
• Category: Additional Wiper & Washer Components

Purpose and function in the vehicle

The offered rain sensor is designed for installation in the front part of the vehicle, in the windshield area. Its task is to continuously measure the amount of water on the glass and transmit a signal to the wiper controller, which then selects the appropriate operating frequency. In practice, this means the driver does not need to manually adjust intervals – the system reacts automatically to light drizzle, heavy rain, or sudden splashes.

Such a solution improves road visibility, reduces distraction, and helps maintain constant focus while driving. In BMW vehicles where the wiper system works with advanced body electronics, a functional rain sensor is a vital element of the entire comfort and safety system.

Compatibility and integration with BMW

The presented sensor has been designed for specific BMW F-series models, which translates into a proper fit for the windshield and correct integration with the factory electrical installation. The appropriate geometry and mounting method allow for stable seating in the designated location without the need for vehicle structural modifications.

The element belongs to the Other wiper parts group, but in practice, it performs the specialized function of an optical sensor that communicates with the control module. As a result, the wiper system can operate in automatic mode, which is particularly beneficial during highway driving, city traffic, and in rapidly changing weather conditions.

Characteristics of the used component

The offered rain sensor is a used part, sourced from dismantling, which allows for an economical repair of the wiper system while maintaining the original BMW specification. Such components are frequently chosen by users who want to maintain the consistency of the vehicle's equipment while controlling service costs.

In the case of electronic elements, it is important to maintain compatibility with the vehicle's factory system – using an original sensor from the same design family promotes correct communication with control modules and minimizes the risk of system operation errors.

Why it is worth using a dedicated rain sensor

Replacing a faulty rain sensor with the correct component dedicated to a specific BMW model brings a number of practical benefits:

• restoration of the automatic wiper operation mode on the windshield,
• more predictable vehicle behavior in rain and during sudden downpours,
• maintenance of full functionality of comfort systems linked to wiper operation,
• consistency with the factory electrical installation and vehicle software.

For many BMW users, it is important that the wiper system operates as close to the factory state as possible – using the appropriate rain sensor allows this effect to be achieved without the need for costly modifications.

Expanding the BMW wiper system

If you are planning a comprehensive repair or upgrade of the windshield area and wiper system in your BMW and need other elements from the same group, such as arms, mounts, or additional control components, check the available parts in the Other BMW wiper parts category.

Practical knowledge when selecting used components

When choosing used electronic components – such as sensors, modules, or controllers – it is worth following principles similar to those applied when selecting powertrain components. Issues of compatibility, purchase cost-effectiveness, and the differences between regeneration and replacement with a used part are discussed in more detail in the article Used gearbox – when is it worth it and what you need to remember. Although it concerns a different sub-assembly, the approach to cost and risk analysis presented there can also be helpful when making a decision about purchasing a used rain sensor.