Mercedes W204 SAM Module Fuse Box Relay Control Unit A2129005722

Mercedes W204 SAM Module Fuse Box Relay Control Unit is an original component from the Fuses and fuse boxes group, designed for advanced electrical circuit management in the vehicle. The module ensures stable power distribution and control of multiple electrical consumers, which translates into safe and predictable operation of the electrical system in your Mercedes.

Specifications and technical data

• SKU: A2129005722
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2129005722
• Substitutable numbers: A2129005722, A 212 900 57 22
• Category: Fuses & Fuse Boxes

Function of the SAM module in the Mercedes W204

The SAM module in the W204 model acts as a central hub managing power supply and control signals for numerous electrical components. It is responsible for, among other things:

• distributing voltage to individual circuits protected by fuses,
• integrating signals from sensors and switches,
• cooperating with other control units in the vehicle network,
• monitoring selected power lines for overloads.

Thanks to this, the electrical system remains organized and easier to diagnose, and potential faults can be located more quickly.

Benefits of using an original SAM module

In the case of such a critical component as the SAM module box, it is crucial to maintain full compatibility with the vehicle's electrical architecture. The original Mercedes component ensures:

• factory fitment for electrical harnesses and connectors in the W204,
• proper cooperation with the software of other control units,
• stable operating parameters across a wide range of loads,
• preservation of factory safety and error diagnostic logic.

Such a solution minimizes the risk of communication problems within the vehicle network and eliminates the need for wiring modifications, which is particularly important for modern electronic systems.

Operational characteristics and installation

The offered module belongs to the Fuses and fuse boxes group, which means it combines the function of a fuse carrier and a control system. In practice, this translates into:

• compact installation in the compartment provided by the manufacturer,
• organized access to fuses and relays,
• the ability to perform electrical diagnostics in one place.

When replacing, it is important to maintain the correct configuration and follow the service procedures provided for the specific model, which allows for trouble-free vehicle startup after installation.

Product condition and practical application

The item is offered as a used OEM component, which in practice means a beneficial combination of original build quality and an attractive price compared to a new part. This type of solution is particularly cost-effective for electrical system repairs where structural and software compatibility with the factory vehicle configuration is essential.

If you are considering choosing between a used original part and a replacement, it is worth checking out the practical tips in the article 5 reasons why a used OEM part is a better choice than a replacement, where you will find specific examples and selection criteria.

Expansion and selection of components from the same group

If you are planning a comprehensive repair or upgrade of the electrical system area in your Mercedes and need other components from the same group, such as additional boxes, distribution modules, or housings with fuse sockets, check out the available parts in the Mercedes Fuses and fuse boxes category.