Mercedes V251 Rear Fuse Box Relay Power Distribution Module Unit A1649820423

The Mercedes V251 Rear Fuse Box Power Distribution and Relay Module is a specialized component of the electrical system, responsible for stable power distribution in the rear of the vehicle. The original Mercedes design ensures proper fit with the factory wiring harness and compatibility with onboard systems, facilitating service and replacement. Consequently, this used module serves as a functional service solution for electrical system repairs in V-Class models, specifically the V251 variant.

Specifications and technical data

• SKU: A1649820423
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1649820423
• Substitutable numbers: A1649820423, A 164 982 04 23
• Location on the vehicle: Rear
• Category: Fuses & Fuse Boxes

Purpose and Function in the Vehicle

The rear fuse box module in the Mercedes V251 is responsible for powering and protecting electrical circuits located in the rear of the body. As a component within the Fuses and Fuse Boxes category, it integrates power supply paths, relays, and fuse sockets into a single housing, simplifying diagnostics and replacement in case of failure.

Its placement in the rear zone of the vehicle allows for shorter cable runs to consumers such as comfort modules or lighting, which reduces voltage drops and improves the reliability of the electrical system.

Construction and Technical Aspects

The power distribution module is designed as a factory component of the Mercedes electrical system, with appropriately selected current paths and sockets for specific types of relays and fuses. The arrangement of connectors and mounting points conforms to the original V251 design, enabling installation in place of the old component without electrical system modifications.

The circuit distribution within the module simplifies servicing: individual sections are logically grouped, which speeds up fault localization and fuse replacement. This makes the module well-suited for both routine repairs and more extensive service work on the rear electrical system.

Benefits of Using an Original Module

Using an original rear fuse box module in the Mercedes V251 ensures:

• a secure fit with the factory wiring harness and mounting points,
• adherence to the manufacturer's designed current carrying capacity parameters,
• consistency with the factory logic of fuses and relays,
• easier diagnostics based on Mercedes service documentation.

A used component allows for economical repair while maintaining the original electrical architecture of the vehicle, which is particularly important for vehicles equipped with extensive comfort electronics.

Selection and Practical Application

When selecting a rear fuse box module for the Mercedes V251, it is crucial to ensure compatibility with the specific vehicle configuration and the factory protection system. This component is designed for installation in the rear of the car, in the location designated by the manufacturer, using original brackets and connectors.

In practice, the module is used for:

• repairs after damage to the electrical system in the rear of the body,
• problems with the power supply to selected consumers in the rear zone,
• the need to replace a damaged fuse box or relay section.

Expanding the Electrical System in a Mercedes

If you are planning a comprehensive repair or upgrade of the electrical system area in the rear of your Mercedes and require other components from the same group, such as additional protection modules, fuse box housings, or service connectors, check the available parts in the Mercedes Fuses and Fuse Boxes category.

To better plan the purchase of a used module and other electrical components, it is worth familiarizing yourself with practical tips for choosing used parts – you can find them in the article Used Parts – Your Guide to the Best Offers in the Automotive Store, which helps you consciously assess the cost-effectiveness and selection method for such items.