Mercedes ML W164 Fuse Box Relay Control Unit Rear A1645403372

Mercedes ML W164 Fuse Box Relay Control Unit Rear is a factory electrical system component responsible for organized power distribution and circuit protection in the rear of the vehicle. As part of the Fuses and fuse boxes group, it ensures stable operation of numerous electrical consumers, minimizing the risk of failure. Using this OEM component allows for a technically correct replacement of a damaged fuse box without interfering with the original wiring architecture.

Specifications and technical data

• SKU: A1645403372-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1645403372
• Substitutable numbers: A1645403372, A 164 540 33 72
• Location on the vehicle: Rear
• Category: Fuses & Fuse Boxes

Purpose and function in the vehicle

Mercedes ML W164 Fuse Box Relay Control Unit Rear is a component mounted in the rear of the car, where key power circuits for lighting, comfort modules, and other electrical systems are concentrated. Its location in the rear area reduces wiring harness length, improves system clarity, and facilitates diagnostics.

In practice, the fuse box performs several essential roles:

• organizes power distribution to individual circuits in the rear zone of the vehicle,
• provides a mounting point for fuses and relays in one easily accessible location,
• protects the installation from the effects of short circuits and overloads,
• facilitates service – the mechanic has quick access to protective elements.

Construction and technical advantages

As an original fuse box from the Fuses and fuse boxes group for Mercedes, the component is designed for specific current loads and circuit layouts in the ML W164 model. The arrangement of fuse and relay sockets is optimized for the factory wiring harness, which eliminates the need for modifications.

Key technical advantages include:

• dedicated design for the rear body electrical installation,
• preservation of the original electrical protection logic,
• compatibility with factory brackets and mounting points,
• possibility of quick replacement of a damaged fuse box without interfering with the wiring harnesses.

Condition and service application

The item is offered as a used original part, which in practice means maintaining factory geometry, connectors, and current path layout. For workshops and private users, this is a cost-effective service solution – the efficiency of the electrical system can be restored without the cost of purchasing a new module.

The fuse box will prove particularly useful in situations such as:

• mechanical or thermal damage to the existing fuse box,
• power supply problems for circuits in the rear of the vehicle,
• the need to restore the original configuration after previous, unprofessional installation modifications.

Compatibility and part selection

As a Mercedes brand product, the fuse box is intended for use in the ML W164 model, specifically for the rear mounting zone. When selecting parts, it is worth paying attention to compatibility with the equipment of a specific vehicle to maintain full functionality of all circuits.

To facilitate identification, the manufacturer has provided an OEM part number and related interchangeable numbers – their compliance with vehicle documentation or service system data allows for precise confirmation of component fitment.

Electrical system expansion and related components

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

To better plan service work and reduce vehicle downtime in the workshop, it is worth learning practical tips on using a wide range of used parts – more information can be found in the article No more weeks of waiting – how a wide assortment in one warehouse really shortens your car's downtime at the mechanic?.