Mercedes W204 Fuse Box Rear SAM Module Electrical Fuse Unit A2049067702

Mercedes W204 Fuse Box Rear SAM Module Electrical Fuse Unit is a factory-original power distribution and circuit protection module designed for installation in the rear of the vehicle. As a component from the Fuses and fuse boxes group, it is responsible for the organized distribution of voltage and the protection of key electrical consumers within the vehicle's electrical system. Using this component allows for a technically correct repair of the installation without the need for the costly purchase of a new part.

Specifications and technical data

• SKU: A2049067702-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2049067702
• Substitutable numbers: A2049067702, A 204 906 77 02
• Location on the vehicle: Rear
• Category: Fuses & Fuse Boxes

Purpose and function in the electrical system

The fuse box located in the rear of the vehicle body is responsible for power distribution to selected circuits, such as rear lighting, specific comfort modules, or additional consumers located in the trunk. Using a dedicated module for a specific vehicle generation ensures:

• correct assignment of circuits to fuse sockets,
• stable electrical connections in the rear body wiring harness,
• easy diagnostics and maintenance thanks to an organized socket structure.

As a result, the electrical installation remains clear and serviceable, and replacing a damaged fuse box restores the proper operation of the protected circuits.

Construction and vehicle placement

The described fuse box is designed for mounting in the rear area of the vehicle, which helps shorten the length of wiring harness sections and reduce voltage drops over long cable runs. The module integrates the following into a single housing:

• fuse sockets for rear circuits,
• connection points for wiring harnesses,
• internal conductive paths that distribute power according to the manufacturer's design.

This solution ensures consistency with the factory electrical diagram and reduces the risk of installation errors that often occur when using universal or non-factory solutions.

Benefits of using an original fuse box

Using an original fuse box in this series of vehicles allows for full compatibility with the existing installation. Key advantages include:

• factory-fit connectors for wiring harnesses in the rear of the vehicle,
• preservation of the original circuit division and protection ratings,
• easier diagnostic work using the manufacturer's service documentation,
• reduced risk of connection overheating due to the correct geometry of current paths.

For workshops and users, this means faster installation, fewer potential secondary faults, and stable operation of the electrical system in the rear of the vehicle.

Condition, verification, and service application

This item comes from the secondary market, which allows for lower repair costs while maintaining the original design. Before installation, it is recommended to perform a standard inspection of the contacts, sockets, and housing for any signs of overheating or mechanical damage. In workshop practice, such a fuse box is used primarily in situations involving:

• mechanical damage to the housing or fuse sockets,
• overheating of current paths as a result of previous faults,
• the need to restore the factory configuration after improper installation modifications.

By maintaining the original connection architecture, the module allows for the restoration of proper operation of the protected circuits without the need to rebuild the wiring harnesses.

System expansion – related components and technical knowledge

If you are planning a comprehensive repair or upgrade of the electrical zone in the rear of your Mercedes and need other components from the same group, such as additional fuse sockets, power distribution modules, or protective covers, check the available parts in the Mercedes Fuses and fuse boxes category.

When performing service work on the electrical installation, the topic of selecting the right transmission for the vehicle's characteristics and driving style often arises; in such cases, it is worth consulting a practical discussion on different types of transmissions and their typical faults in the article Transmission: manual, automatic, or DSG – typical faults and a guide to buying a used gearbox, which helps in better planning the long-term operation of the car.