Fuse Box Mercedes W212 Rear Relay Control Unit Electric Module SAM A2129060005

The Mercedes W212 SAM Control Unit is a component from the Fuses and Fuse Boxes category, responsible for advanced electrical circuit management in the rear of the vehicle. This component, designed for Mercedes E-Class W212 models, ensures organized power distribution and control of numerous electrical consumers. Thanks to its OEM factory construction, the module maintains full compatibility with the car's electrical system.

Specifications and technical data

• SKU: A2129060005
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2129060005
• Substitutable numbers: A2129060005, A 212 906 00 05, A2129062304, A 212 906 23 04
• Location on the vehicle: Rear
• Category: Fuses & Fuse Boxes

Purpose and Function of the SAM Module

The Mercedes W212 SAM Control Unit is a rear management unit, installed in the trunk area, which integrates the functions of a fuse box and a control module. It is responsible for distributing power to selected circuits, monitoring their load, and protecting the system from damage caused by overloads or short circuits.

Its placement in the rear of the vehicle allows for shorter wiring harnesses leading to rear consumers, which reduces voltage drops and improves system operational stability. The use of a dedicated SAM module also simplifies diagnostics – potential faults are concentrated in one, more accessible point of the system.

Construction and Integration with the Electrical System

The module combines the function of a fuse box and an electronic controller in a single housing, simplifying the vehicle's electrical architecture. The connectors are designed for the specific Mercedes platform, ensuring that connection to the factory wiring harness is organized and repeatable. This design minimizes the risk of installation errors and ensures stable electrical contact.

As an original Mercedes part, the module is adapted to the requirements of the W212's onboard systems, including communication with other control units via data buses. This allows for proper cooperation with comfort systems, lighting, and other functions managed from the rear of the body.

Benefits of Using an Original SAM Fuse Box

Using a dedicated SAM module in the Mercedes W212 offers a number of practical benefits:

• consistency with the vehicle's factory electrical architecture,
• organized routing and protection of circuits in the rear of the car,
• easier electrical fault diagnostics due to centralized functions,
• reduced risk of compatibility issues compared to universal aftermarket parts.

For the user, this means more stable operation of electrical systems and a lower probability of unexpected failures related to the power supply of rear consumers.

Condition, Fitment, and Service Application

The offered module is from a used vehicle, making it an attractive service solution for Mercedes W212 owners seeking an economical yet original-compliant part. This type of component is particularly useful for repairs after electrical system damage, power supply issues in the rear of the body, or when replacing a faulty fuse box.

Before installation, standard service procedures are recommended, including checking wiring harnesses, connectors, and the correctness of the vehicle's configuration. Thanks to its factory designation for the W212 platform, the replacement process is predictable and can be performed according to the manufacturer's service documentation.

Mercedes Fuses and Fuse Boxes – Selecting the Right Components

If you need other components from the Fuses and Fuse Boxes category designed for this brand's vehicles, check out the Mercedes fuses and fuse boxes available in our assortment to select a component precisely matched to your specific model version.

More Technical Knowledge

For drivers interested in a broader context of component operation in a car, including the impact of temperature and loads on engine durability, we recommend the guide article Engine Cooling System – Overheating, Repair, and Used Radiators, which helps to better understand the relationships between component efficiency and engine lifespan.