Rain Sensor Mercedes W118 W177 W247 Windscreen Light Control Unit A2479009107

The Mercedes W212 Rain and Light Sensor A2079012200 is an original part from the Electronic Control Units and Controllers group, designed for precise control of automatic light activation and wipers in Mercedes vehicles. This component ensures stable compatibility with the factory electrical system, enhancing driving comfort and safety in varying weather conditions.

Specifications and technical data

• SKU: A2479009107
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2479009107
• Substitutable numbers: A2479009107, A 247 900 91 07, 6PW013009, 6PW 013 009, KD
• Category: ECUs & Computer Modules

Function and Application of the Rain and Light Sensor

The rain and light sensor is responsible for automatically controlling the operation of wipers and the activation of exterior lighting based on the intensity of precipitation and light. In Mercedes W212 series vehicles, it works in conjunction with comfort modules and the lighting system, enabling:

• smooth adjustment of wiper frequency depending on rain intensity,
• automatic activation of low beam headlights in reduced visibility conditions,
• increased driver convenience by minimizing manual switch operation,
• consistent operation with other electronic vehicle systems.

Thanks to this, the rain and light sensor for Mercedes W212 effectively supports safe vehicle operation in urban traffic and on the road.

Benefits of Using an Original Mercedes Module

As a part of the Electronic Control Units and Controllers group, the sensor is designed for Mercedes' specific electrical architecture. This translates to:

• factory-perfect fit for the electrical installation and wiring harnesses,
• correct communication with other vehicle controllers,
• stable operation of automatic functions without unwanted system errors,
• preservation of the original operating logic for comfort and lighting systems.

A used, functional module of this type offers a sensible compromise between cost and maintaining high quality and compliance with original manufacturer standards.

Condition, Verification, and Selection by OEM

The offered sensor is in used condition, which means it comes from a dismantled vehicle and has been verified for its suitability for further use. Such electronic components are particularly cost-effective for repairs when you aim to maintain the vehicle's original specifications without investing in a new part.

When selecting a sensor for a specific car, it is advisable to base your choice on the OEM number and interchangeable numbers, as well as vehicle data (model, year, equipment version). This minimizes the risk of hardware and software compatibility issues after installation.

If you wish to deepen your knowledge on the safe selection of used control units and sensors, how to choose them by number, and compatibility issues, consult the guide: Used Automotive Electronics – ECU Modules and Second-Hand Sensors.

Installation and Integration with Vehicle Systems

The rain and light sensor in the Mercedes W212 is integrated into the vehicle's electronic system. Therefore, during installation, it is crucial to maintain the correct position relative to the windshield and ensure proper connection to the wiring harness. In many cases, when using the correct OEM number, installation is similar to a plug-and-play solution, without the need for installation modifications.

After installation, it is recommended to perform service procedures specified by the manufacturer, such as potential calibration or adaptation in the diagnostic system, to ensure proper response to changes in light and precipitation intensity. A correctly selected and installed module allows for full utilization of the comfort functions intended for that specific Mercedes model.

Expanding Mercedes Electronics System

If you are planning a comprehensive repair or upgrade of the comfort and safety electronics in your Mercedes and require other parts from the same group, such as control units, comfort modules, or additional sensors, check the available parts in the Mercedes Electronic Control Units and Controllers category.