Mercedes W177 Windscreen Windshield Rain Light Sensor Unit A2479007304

Mercedes W177 Windscreen Windshield Rain Light Sensor Unit is an original Mercedes component designed for precise control of wiper operation based on rainfall intensity. This component from the Other wiper parts group allows for maintaining driving comfort and safety, ensuring an automatic response of the wiper system to changing weather conditions.

Specifications and technical data

• SKU: A2479007304
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2479007304
• Substitutable numbers: A2479007304, A 247 900 73 04
• Category: Additional Wiper & Washer Components

Function and application of the Mercedes W177 rain sensor

The rain sensor works with the windshield and the vehicle's control module, analyzing the amount of water on the glass surface and sending a signal to the wiper system. Thanks to this, the wipers can operate in automatic mode without the need for manual adjustment by the driver. In W177 series models, such an element is particularly important for maintaining the full functionality of comfort systems and the correct operation of the AUTO mode on the wiper switch.

A properly selected rain sensor allows for maintaining the consistency of the factory electronics, minimizing the risk of communication errors with other body control modules. This is a beneficial solution both for post-accident repairs and when replacing the windshield, when it is necessary to re-equip the vehicle with a functional measuring element.

Benefits of using an original Mercedes component

Choosing an original rain sensor dedicated to the W177 ensures proper fitment to the electrical installation and compatibility with the vehicle's software. Thanks to this:

• the correct operation of the automatic wiper mode is maintained,
• consistency with factory comfort settings is preserved,
• the risk of errors appearing in onboard systems is reduced.

For the user, this means stable operation of the wiper system in the rain, better visibility, and driving convenience without the need to constantly reach for the stalk. When servicing modern Mercedes models, the use of the correct component from the Other wiper parts group has a direct impact on the comfort of daily operation.

Product characteristics and condition

The offered rain sensor comes from a Mercedes vehicle and is a used item, which provides an attractive cost-effective solution while maintaining the manufacturer's original specifications. This type of component is particularly useful for:

• repairs after windshield damage,
• restoring the efficiency of the wiper system after a sensor failure,
• servicing comfort installations when an element consistent with the factory configuration is required.

A used, original rain sensor is a reasonable compromise between quality and repair cost, allowing to maintain high system functionality without the need to resort to unreliable replacements.

Support in selection and optimization of service costs

When selecting a rain sensor for a specific W177 equipment version, it is worth paying attention to compatibility with the vehicle's electronics and the configuration of comfort systems. It is helpful to compare technical data and part markings in the service documentation to ensure full compatibility after installation.

If you want to better understand how used OEM parts help reduce repair expenses while maintaining high service quality, check out the article Rising repair costs and the boom in used parts – how to save on car service?, which discusses a practical approach to choosing dismantled parts.

Related Mercedes wiper system components

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