SAM Module Mercedes W213 C238 Rear Trunk Control Unit ECU A2139003326

SAM Module Mercedes W213 C238 Rear Trunk Control Unit ECU is an advanced electronic body component responsible for managing numerous comfort and equipment functions in the rear of the vehicle. As part of the Electronic control modules and controllers group, it ensures consistent control of the electrical installation and stable communication with other vehicle systems. This solution is designed for users who expect precise operation of comfort systems in a premium-class Mercedes.

Specifications and technical data

• SKU: A2139003326
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2139003326
• Substitutable numbers: A2139003326, A 213 900 33 26
• Location on the vehicle: Rear
• Category: ECUs & Computer Modules

Purpose and function of the SAM module in the Mercedes W213 / C238

The presented comfort controller is a component of the electrical architecture of the Mercedes E-Class W213 and C238 models, responsible for handling selected functions in the rear zone of the vehicle. The SAM module integrates signals from sensors and switches and then transmits them to the appropriate receivers, allowing for organized management of electrical circuits. As a result, the comfort system operates in a predictable manner, and communication with other controllers takes place within the factory vehicle network.

Placement on the vehicle and role in the electrical installation

The module is designed for installation in the rear of the vehicle, which helps reduce the length of the electrical wiring harnesses leading to the body components located at the back. Such placement minimizes voltage drops, facilitates diagnostics and service, and improves the clarity of the entire installation. The controller works with other electronic control modules to create a coherent comfort and lighting management system, consistent with Mercedes' factory logic.

Benefits of using an original comfort controller

Using an original SAM module in a Mercedes W213 or C238 allows for maintaining the vehicle's factory configuration and proper cooperation with other controllers. Key advantages include:

• maintaining compatibility with the factory electrical architecture and vehicle software,
• stable operation of comfort systems in the rear of the body,
• easier diagnostics using dedicated service tools,
• the ability to restore original functionality after the previous module has been damaged.

For workshops and users, this means predictable behavior of electrical systems and a reduction in the risk of communication problems between controllers.

Product characteristics and practical application

The offered item belongs to the Electronic control modules and controllers group, which means it serves as a central management point for selected circuits in the vehicle. As a used part, it comes from disassembly and is intended for further use after proper installation and configuration in the vehicle. In practice, this module is used both for repairs following electrical damage and for restoring installations after collisions or interference with electrical wiring.

Selection, installation, and configuration of the controller

When selecting a comfort controller for a Mercedes W213 or C238, it is crucial to pay attention to compatibility with the specific equipment version and the vehicle's production year. It is recommended to match the part by its OEM number and verify hardware and software compatibility based on service documentation or specialized diagnostic software. Installation should be performed by a person with experience in electrical installations in Mercedes vehicles, following procedures for disconnecting power, securing connectors, and subsequent module adaptation in the system.

If you are planning a comprehensive repair or upgrade of the electrical installation area in your Mercedes and need other components from the same group, such as additional controllers, body modules, or comfort management units, check the available parts in the Mercedes electronic control modules and controllers category.

To better understand how to safely select and install used controllers and other vehicle electronics components, it is worth reading the guide on selection by OEM number, hardware and software compatibility, and practical aspects of installation: Used automotive electronics on board – why is it worth choosing second-hand ECU modules and sensors?.