Mercedes W204 SAM Module Control Unit Rear A2049060305

Mercedes W204 SAM Control Module A2049060305 is an advanced electrical system component responsible for intelligent circuit management in the rear of the vehicle. As part of the Electronic Control Modules and Controllers group, it ensures consistent control of numerous body functions, supporting stable and predictable system operation. A used OEM component is a sensible choice for drivers seeking a proven solution at an attractive price.

Specifications and technical data

• SKU: A2049060305-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2049060305
• Substitutable numbers: A2049060305, A 204 906 03 05, 5DK011022-12, 5DK 011 022-12
• Location on the vehicle: Rear
• Category: ECUs & Computer Modules

Purpose and Function of the SAM Module

The SAM control unit in the Mercedes W204 acts as a central hub for power distribution and control signals in the rear of the car. It is responsible for logical circuit management, cooperation with the lighting system, comfort features, and other electrical components. This keeps the vehicle's electrical system organized, with individual functions handled in a predictable and repeatable manner.

Vehicle Placement and System Integration

The module is designed for installation in the rear of the car, in accordance with the factory electrical system architecture. This vehicle placement allows for shorter wiring harnesses, reduced voltage drops, and simplified diagnosis of potential faults. The control unit communicates with other modules in the vehicle, forming a cohesive communication and power system.

Benefits of Using an Original Mercedes Controller

Choosing an original module from the Mercedes brand means maintaining the factory operating logic of the systems and full compatibility with the vehicle's construction. Key advantages of this solution include:

• factory fit for the electrical system and vehicle architecture,
• preservation of original operating parameters for comfort and safety systems,
• compatibility with the software of other control units in the car,
• diagnosability using standard service tools.

Additionally, the presence of dedicated part numbers and interchangeable numbers simplifies the selection of the appropriate module variant for a specific vehicle configuration.

Characteristics of a Used Product

The offered SAM control unit is a used component, representing a favorable compromise between repair cost and maintaining OEM quality. This type of part allows for restoring the electrical system's functionality without the need to invest in a new component. In practice, this is often the preferred solution in professional automotive electronics workshops.

Before installation, the standard service procedure is recommended: verify compatibility by OEM number, check hardware and software version compliance, and perform any necessary adaptations using an appropriate diagnostic tester.

Selection by OEM Number and Interchangeable Numbers

This control unit model has an assigned OEM part number and associated interchangeable numbers, significantly simplifying the identification of the correct component. In practice, this means the module can be selected based on:

• the OEM number assigned to a specific reference,
• the list of interchangeable numbers approved by the manufacturer,
• designations used by automotive electronics suppliers.

If you want to deepen your knowledge on safely selecting used control units and sensors, how to verify compatibility, and best installation practices, check out the guide: Used Automotive Electronics – How to Make Informed Choices for Control Modules and Sensors by OEM Number.

Practical Application in Service

The Mercedes W204 SAM Control Module A2049060305 is suitable for both professional dealerships and independent workshops specializing in electronics. It can be used for:

• repairs of the electrical system in the rear of the vehicle,
• resolving power supply issues for selected circuits,
• restoring functionality after mechanical damage or flooding of the original module,
• comparative diagnostics – as a test element.

If you are assembling a larger set of parts for vehicle repair, consider the one-stop-shop model – you can find more on this topic in the article: How to Assemble Used Car Parts in One Place and Avoid Problems with Replacements.

Summary

This control unit from the Electronic Control Modules and Controllers group is a practical solution for Mercedes W204 owners who want to restore the correct operation of the electrical system in the rear of the vehicle while maintaining the factory operating logic of the systems. A used OEM module allows for reduced repair costs while maintaining a high level of compatibility and predictable operation of the entire system.