Mercedes W167 W177 W205 W213 Trunk Lid Opening Sensor Control Unit A2139052503

Mercedes W167 W177 W205 W213 Trunk Lid Opening Sensor Control Unit is a component from the Electronic control modules and controllers group, responsible for precisely detecting the position of the trunk lid in selected Mercedes models. It enables the proper operation of comfort and safety systems, such as automatic closing, open trunk signaling, or integration with the vehicle's body electronics.

Specifications and technical data

• SKU: A2139052503
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2139052503
• Substitutable numbers: A2139052503, A 213 905 25 03
• Category: ECUs & Computer Modules

Function and application of the trunk lid opening sensor

The trunk lid opening sensor in Mercedes W167, W177, W205, and W213 models is responsible for transmitting information about the current state of the lid – whether it is closed, ajar, or open – to the body control units. This enables:

• proper operation of the trunk lighting,
• displaying warning messages on the instrument cluster,
• cooperation with comfort access and closing systems,
• integration with alarm systems and vehicle security features.

A functional sensor is crucial for the stable operation of the body electronics, eliminating false "trunk open" messages and issues with central locking.

Electronic control modules and controllers in Mercedes

The component belongs to the Electronic control modules and controllers group, which means it works with other electronic systems of the vehicle to create a coherent body function management system. In modern Mercedes vehicles, the signal from the sensor is processed by appropriate controllers that:

• coordinate the operation of the central locking and comfort access system,
• control light and sound signaling,
• communicate with modules responsible for safety and anti-theft protection.

As a result, replacing the sensor with a functional unit allows for restoring the correct operation of the entire associated electronic system.

Benefits of using an original Mercedes component

Using an original trunk lid opening sensor dedicated to specific generations of Mercedes W167, W177, W205, and W213 ensures:

• precise fitment to the electrical installation and factory mounts,
• consistency with body control unit software,
• stable operating parameters under typical operating conditions,
• reduction of the risk of communication errors in the vehicle network.

This solution is particularly beneficial when diagnosing faults related to incorrect trunk status indications, alarm issues, or central locking problems.

Characteristics of the used component

The offered sensor comes from dismantling, which allows combining original manufacturing quality with an attractive purchase price. A used component from the Electronic control modules and controllers group is a good choice when you want to maintain the vehicle's factory specifications while optimizing repair costs. Such components, sourced from vehicles operated under controlled conditions, often retain full functionality and are ready for further service in another car.

Expansion and service of electronics in Mercedes

If you are planning a comprehensive repair or upgrade of the rear body area in your Mercedes and need other elements from the same group, such as additional controllers, body modules, or position sensors, check the available parts in the Mercedes electronic control modules and controllers category.

When working with body electronics, it is also worth expanding your knowledge about the diagnostics and operation of control modules. Practical tips on working with used controllers and comfort modules can be found in the article: Driving pleasure for years – how to take care of iDrive systems and electronic modules in BMW 3 and 5 series models using dismantled parts?, which discusses universal principles for selecting and installing electronic components from the secondary market.