Mercedes W212 Fuse Box Rear SAM Relay Control Unit Module A2129001306

Mercedes W212 Fuse Box A2129001306 is an original electrical system component designed for installation in the rear of the vehicle. Thanks to its factory design, it ensures consistent electrical circuit management and stable protection for key consumers. This is a practical solution for users who want to maintain compatibility with the factory electrical architecture of their Mercedes.

Specifications and technical data

• SKU: A2129001306
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2129001306
• Substitutable numbers: A2129001306, A 212 900 13 06, KZ
• Location on the vehicle: Rear
• Category: Fuses & Fuse Boxes

Purpose and Function in the Electrical System

The rear-mounted fuse box is responsible for power distribution and protection of selected electrical circuits in the trunk area and the rear of the body. This component is important for:

• safe protection of circuits against overload and short circuits,
• organized power routing to individual modules,
• maintaining the factory logic of the Mercedes W212 electrical system.

By using an original fuse box from the Fuses and Fuse Boxes group, the risk of compatibility issues and incorrect operation of electrical systems is minimized.

Benefits of Using an Original Fuse Box

Choosing a factory solution for your Mercedes translates into a number of practical advantages in daily vehicle operation:

• Perfect Structural Fit – the fuse box is designed for the specific W212 platform, with the correct layout of sockets and connectors.
• Consistency with Service Documentation – facilitates diagnostics, circuit location, and work with factory wiring diagrams.
• Stable Mounting in the Rear of the Vehicle – designated mounting points reduce vibrations and mechanical stress.
• Clear Circuit Organization – the logical arrangement of fuses and relays allows for quick inspections and potential repairs.

Characteristics of Rear Vehicle Installation

The placement of the fuse box in the rear section of the Mercedes W212 allows for efficient management of power circuits supplying components located in the trunk and the rear of the body. This configuration:

• shortens the length of some wiring harnesses,
• facilitates service access from the trunk side,
• reduces the need for intervention in the front part of the system when working in the rear area.

For workshops and users, this means a more predictable service process and a lower risk of errors when servicing the electrical system.

Component Condition and Practical Application

The fuse box is offered as a used part, allowing for an economical replacement of a damaged module while maintaining the original manufacturer's specifications. This solution is particularly beneficial for:

• repairs after electrical system damage,
• resolving power supply issues in the rear of the vehicle,
• restoring full functionality after interventions in the electrical system.

Using an original fuse box helps maintain the stability of electrical systems and reduce the risk of incorrectly selected aftermarket replacements.

System Expansion and Additional Materials

If you are planning a comprehensive repair or upgrade of the electrical zone in your Mercedes and need other components from the same group, such as additional fuse boxes, protection modules, or circuit distributors, check the available parts in the Mercedes Fuses and Fuse Boxes category.

Before undertaking major service work, especially during the autumn and winter seasons, it is worth familiarizing yourself with practical tips for preparing your car – the article Winter Essentials: Which Used Car Parts Are Worth Checking and Replacing Before the Frost?, containing checklists and information on selecting parts by OEM numbers, may be helpful.