Mercedes W204 Rear SAM Module Fuse Box Control Unit A2049006301

The Mercedes W204 Rear SAM Module / Fuse Box is an advanced electronic control unit responsible for power distribution and control of numerous circuits in the rear of the vehicle. A correctly selected and functional module ensures stable operation of the electrical system, reduces the risk of malfunctions, and facilitates diagnostics. By choosing an original part designed for the Mercedes C-Class W204, you invest in compatibility with the car's factory electrical architecture.

Specifications and technical data

• SKU: A2049006301-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2049006301
• Substitutable numbers: A2049006301, A 204 900 63 01, 5DK00922514, 5DK 009 225 14, A2045458732, A 204 545 87 32
• Location on the vehicle: Rear
• Part type: Fuse Box
• Category: Fuses & Fuse Boxes

Function and Role of the Rear SAM Module in the Mercedes W204

The Rear SAM (Signal Acquisition Module) plays a crucial role in managing power and control signals in the rear of the Mercedes W204. It is responsible for, among other things, handling lighting circuits, selected comfort features, and protecting individual power lines through its integrated fuse box. This ensures the entire system is organized, with individual circuits logically separated and easier to service.

Using a dedicated module for this Mercedes model maintains consistency with the vehicle's factory configuration, which is particularly important when working with the CAN bus, coding, and computer diagnostics. A correctly selected SAM module minimizes the risk of communication errors between control units and simplifies subsequent service work.

Construction, Integration, and Technical Advantages

The Rear SAM module in the Mercedes W204 combines the functions of a fuse box and a control unit within a single housing. This design reduces the number of connections, improves system clarity, and facilitates access to the fuses for individual circuits. Using an original solution from the Mercedes brand ensures compatibility with factory wiring harnesses, connectors, and electrical diagrams.

The main technical advantages of this type of module include:

• integration of multiple functions into a single component,
• designed to work with Mercedes diagnostic systems,
• logical arrangement of fuses and relays,
• stable operation under conditions typical for a trunk compartment.

Consequently, the rear vehicle SAM module is an important element of the entire electrical system, contributing to reliable daily operation.

Application in Service, Repairs, and Youngtimer Restoration

The Mercedes C-Class W204 generation is increasingly considered an attractive youngtimer, especially well-maintained versions with richer equipment. In such vehicles, functional electronics directly impact user comfort and the car's technical assessment. Replacing a faulty rear SAM module with the correct part is one of the key steps in restoring full functionality to lighting, comfort, and selected safety systems.

If you are planning a comprehensive electrical refresh for your Mercedes from the years 1998–2012, we recommend reading our blog guide: Second Life for a Youngtimer – How Used Car Parts Revitalize Cars from 1998–2012. You will find practical tips on selecting and installing used components in Mercedes and other popular brands.

Selection, Compatibility, and Installation Aspects

For the rear SAM module to function correctly, it must be compatible with the specific equipment configuration of a given Mercedes W204. When selecting a part, pay attention to:

• compatibility with the body version and model year,
• the type of electrical system installed,
• coding and adaptation requirements for the vehicle.

In many cases, installation involves mechanically fitting the module into its factory location and connecting the wiring harnesses to the appropriate connectors. Further steps may require using a factory diagnostic tester to check communication with other control units. A correctly performed replacement restores full functionality to the systems powered by the module without the need for modifications beyond factory standards.

Benefits of Using an Original Module in a Mercedes

Choosing an original rear SAM module for the Mercedes W204 is a solution that technically and functionally surpasses random aftermarket replacements. You receive a component designed specifically for this model, with appropriate electrical characteristics and full integration with other control units. This translates to:

• stable operation of the electrical system in the rear of the vehicle,
• easier diagnostics and servicing,
• preservation of factory comfort and safety functions,
• greater predictability of the vehicle's behavior in the long term.

For owners who want to maintain their Mercedes W204 in good technical condition or are preparing the car for extended use, a dedicated rear SAM module is a sensible investment in the reliability of the electrical system.