Mercedes CL203 Rear Roof Alarm Motion Sensor Cover Trim Black A2038219551

Mercedes CL203 Rear Roof Alarm Motion Sensor Cover Trim is a precisely fitted trim element designed for installation in the rear section of the headliner. The black color ensures consistency with the factory interior styling, and the design, prepared for the motion sensor, allows for aesthetic integration of the alarm system. It is a practical solution for users who want to maintain the original look and functionality of the security system in their Mercedes.

Specifications and technical data

• SKU: A2038219551
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2038219551
• Substitutable numbers: A2038219551, A 203 821 95 51, KZ
• Location on the vehicle: Rear
• Color: Black
• Category: ECUs & Computer Modules

Purpose and function of the component

The described cover is part of the Electronic control modules and controllers group, responsible for the aesthetic and secure mounting of the rear alarm motion sensor in the vehicle's roof. The component is installed in the rear zone of the passenger cabin, in the headliner area, where it protects the sensor against mechanical damage and limits its exposure to dirt.

Thanks to its properly shaped geometry, the cover ensures the correct field of view for the sensor, which promotes stable operation of the alarm system and minimizes the risk of false alarms. Factory fitment for the specific Mercedes platform facilitates installation and allows for maintaining the original electrical wiring routing.

Construction, color scheme, and interior integration

The cover is made in black, which enables harmonious integration with most upholstery and headliner configurations used in Mercedes coupe models. The neutral color limits light reflections and does not distract the driver or passengers, while also effectively masking any minor signs of wear.

The design of the element includes openings and indentations for the alarm motion sensor, so there is no need for additional adjustments or modifications. The properly selected thickness and shape ensure stable seating in the headliner and proper adhesion to adjacent trim panels.

Service and upgrade application

The rear alarm motion sensor cover is suitable both for standard replacement of a damaged part and for retrofitting the car with an alarm system, provided the factory installation allows for mounting the sensor in the rear roof section. Using an original component allows for maintaining structural and visual consistency of the interior, which is particularly important in premium class vehicles.

The element from this group may be useful, among others, for:

• repairing or replacing the headliner after a collision or flooding,
• servicing the alarm system when disassembly and reassembly of the sensor is necessary,
• restoring the factory state of equipment after previous interior modifications.

Benefits of using an original cover

Using a dedicated motion sensor cover in the rear roof section allows for maintaining proper operating conditions for the alarm electronics and cabin aesthetics. Original fitment for the Mercedes brand reduces the risk of looseness, rattles, or improper adhesion of the element, which is typical for universal aftermarket replacements.

A used component of this type is an attractive cost-effective solution, especially in the case of post-accident repairs or interior renovations, where compliance with the factory design and the ability to install without additional modifications are key.

Support for selecting electronics and alarm components

When working with alarm systems and motion sensors, it is worth paying attention to the compatibility of modules, hardware versions, and software. Practical tips on selecting and installing used electronic components can be found in the Global Parts guide: Used automotive electronics on board – why is it worth choosing second-hand ECU modules and sensors?

If you are planning a comprehensive repair or upgrade of the security and comfort zone in your Mercedes and need other elements from the same group, such as control modules, comfort controllers, or sensor housings, check the available parts in the Mercedes electronic control modules and controllers category.