Mercedes-Benz E W207 A207 SAM Control Unit Module Fuse Box Rear A2129004222

Mercedes-Benz E W207 A207 SAM Control Unit Module Fuse Box Rear is an advanced electrical system component responsible for stable power supply and control of multiple circuits in the rear section of the vehicle. Thanks to its factory design intended for E-Class W207 and A207 models, it ensures consistency with the original installation and predictable behavior of onboard systems. This is a practical solution for users who want to restore proper electronics operation without interfering with vehicle wiring or parameters.

Specifications and technical data

• SKU: A2129004222
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2129004222
• Substitutable numbers: A2129004222, A 212 900 42 22, BG
• Location on the vehicle: Rear
• Category: Fuses & Fuse Boxes

Function of the SAM module and the role of the rear axle fuse box

The SAM module integrated with the fuse box in the rear of the body is responsible for power distribution and control of selected electrical circuits. In practice, this means:

• control of power supply for consumers located in the rear zone of the vehicle,
• circuit protection through appropriately selected fuses,
• reduction of the risk of overloads and short circuits in the installation,
• organized power routing in a single, easily accessible service point.

Thanks to its factory architecture, the module works with the body electronics in a predictable manner, which promotes stable operation of comfort and safety systems.

Designed for Mercedes-Benz E W207 / A207

The presented element has been designed for the rear body area in Mercedes-Benz E-Class W207 and A207 series models. The appropriate arrangement of connectors and fuse sockets facilitates installation in the original location, without the need for installation modifications.

Such structural fit allows for maintaining factory control logic while reducing the time required for diagnostics and replacement of a damaged module. This is particularly important in vehicles where consistency with the manufacturer's electronic systems is essential.

Benefits of using an original control module

Using an original SAM module with a fuse box in the rear of the vehicle brings a number of practical service and operational benefits:

• preservation of factory electrical system operating parameters,
• easier diagnostics due to compliance with manufacturer service procedures,
• organized access to fuses responsible for the rear zone of the vehicle,
• reduction of the risk of installation errors resulting from the adaptation of unforeseen solutions.

For workshops and users, this means a more predictable repair process and the ability to restore full functionality of electrical systems more quickly.

Condition, installation, and service application

The element comes from the secondary market, which makes it a reasonable choice for repairs where the cost-to-functionality ratio is important. The module is particularly useful in situations where the fuse box in the rear of the vehicle has been damaged or there is a failure in the control of circuits powered from this area.

Due to its specific placement in the vehicle, installation should be performed in accordance with safety procedures, including disconnecting the power supply and checking the correct seating of connectors. A properly installed module allows for restoring power continuity in the rear of the body and reduces the risk of recurring faults resulting from unstable connections.

Electrical system expansion and related components

If you are planning a comprehensive repair or upgrade of the electrical installation area in your Mercedes and need other elements from the same group, such as additional modules, sockets, or housings, check the available parts in the Mercedes Fuses and Fuse Boxes category.

For broader work related to power supply and electronics, it is also worth paying attention to the condition of other charging system components. Practical tips on evaluating the cost-effectiveness of using secondary market components can be found in the article When is it worth replacing an alternator with a used one: a practical guide for drivers, which helps to better plan the service strategy for the entire electrical system.