Mercedes-Benz E-Class W210 Diesel Fuse Box Relay Control Unit A0005400372

The Mercedes-Benz E-Class W210 Diesel Fuse Box Relay Control Unit is a factory-fitted module responsible for power distribution and electrical circuit control in the vehicle. As an item from the Fuses and fuse boxes group, it ensures organized circuit routing, stable system operation, and facilitates the diagnosis of electrical faults.

Specifications and technical data

• SKU: A0005400372
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A0005400372
• Substitutable numbers: A0005400372, A 000 540 03 72, BG
• Fuel type: Diesel
• Category: Fuses & Fuse Boxes

Purpose and function in the electrical system

The presented fuse box with relay module has been designed specifically for the Diesel version of the Mercedes-Benz E-Class W210 generation. It is responsible for the logical arrangement of fuses and relays, as well as their integration with the vehicle's main wiring harness. A correctly selected module of this type reduces the risk of overloads, makes it easier to locate damaged circuits, and supports the stable operation of key components, such as engine control systems, lighting, or comfort equipment.

Benefits of using the original module

Using the original fuse and relay box in a Mercedes-Benz E-Class W210 allows you to maintain the factory electrical system architecture. The main advantages include:

• compatibility with the vehicle's factory electrical diagram,
• properly matched fuse and relay sockets,
• stable contact connections that reduce voltage drops,
• easier diagnostics based on Mercedes service documentation.

As a result, this module is a practical solution for electrical system repairs, replacing a damaged box, or restoring full power system functionality in diesel-powered vehicles.

Condition, installation, and service aspects

The item is offered as a used part, which allows for cost-effective repair while maintaining the manufacturer's original specifications. The module is designed for installation in place of the factory box, using existing connectors and mounts in the vehicle's engine bay. In practice, this means:

• no need for electrical wiring modifications,
• preservation of the original wiring layout,
• the ability to use standard Mercedes service procedures.

Before installation, it is recommended to perform a standard inspection of the contacts, sockets, and relays, as well as to verify the configuration against the specific equipment version of the vehicle.

Application in diagnostics and system upgrades

The Mercedes-Benz E-Class W210 Diesel Fuse Box Relay Control Unit is a key reference point when diagnosing electrical faults. The organized layout of circuits allows for quick checking of individual power lines, and access to fuses and relays makes it easier to locate the causes of power loss in selected systems. In the case of upgrades or system expansions (e.g., adding extra components), maintaining a functional, factory control module minimizes the risk of incorrect connections and overloads.

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

For a comparison of solutions used in other brands and a better understanding of the benefits of original used components, it is worth checking out our guide on timing system servicing in BMW engines – you can find practical tips in the article BMW N47 timing chain – typical failure and repair using original BMW parts.