Mercedes W205 Door Wiring Loom Harness Rear Left Right N/O/S A2055409108

Mercedes W205 Door Wiring Loom Harness Rear Left Right is an original electrical installation component designed for installation in the rear left or right door. As part of the Wires, harnesses and connectors group, it ensures a stable connection between body modules and door equipment, supporting the proper operation of the vehicle's electrical system. The used OEM component allows for a technically correct repair without the need for installation modifications.

Specifications and technical data

• SKU: RHD-A2055409108
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2055409108
• Substitutable numbers: A2055409108, A 205 540 91 08
• Location on the vehicle: Rear, Right, Left
• Part type: Loom
• Category: Wiring Harnesses, Cables & Connectors

Purpose and function in the electrical system

The described door wiring harness has been designed specifically for the Mercedes C-Class W205 generation body and operates in the rear part of the vehicle, on both the driver and passenger sides. It is responsible for transmitting signals and power between the body installation and components located in the doors, such as actuators, controllers, or sensors. Thanks to factory-standard wire routing and matched connectors, it ensures stable electrical communication and reduces the risk of interference or circuit breaks.

Construction and mounting fitment

The harness belongs to the Wires, harnesses and connectors group, which means it consists of a set of wires with appropriately selected cross-sections, insulation, and factory connectors matching the sockets in the door and body. The connectors used are prepared for direct plugging into the original modules, which facilitates installation and reduces the need for interference with the factory wiring. The placement in the rear part of the vehicle on the left or right side allows the harness to be used for repairs of both rear doors, depending on the body configuration. Such a solution promotes the maintenance of electrical system consistency and proper wire routing in the grommets between the pillar and the door.

Service application and installation benefits

The rear door wiring harness for the Mercedes W205 is particularly useful in situations where the factory installation has suffered mechanical damage (broken wires in the grommet, contact corrosion, post-collision damage) or there are problems with powering components in the door. Using an original component allows you to:

• restore the factory wire routing in the door,
• maintain compatibility with body control modules,
• minimize the risk of installation errors during repair,
• maintain the clarity and serviceability of the electrical system. Thanks to this, the repair is more predictable, and the diagnostics of any future faults remain clear for the service center.

Product characteristics and condition

The offered harness is a used component, sourced from dismantling, which allows for an economical repair while maintaining the manufacturer's original specifications. This type of component is particularly useful in professional workshops dealing with body electrical repairs in Mercedes vehicles, as well as for individual users who expect factory-matched connectors and wire lengths without the need for custom wiring.

Complementary Mercedes Wires, harnesses and connectors

If you are planning a comprehensive repair or upgrade of the door and body zone in your Mercedes and need other elements from the same group, such as additional door harnesses, wire sections, or installation connectors, check the available parts in the Mercedes Wires, harnesses and connectors category.

Technical support and knowledge about vehicle systems

When working with electrical installations and control elements in a car, it is worth understanding the relationships between harnesses, modules, and the steering and body system. Additional information on component operation, diagnostics, and examples of used parts can be found in the article Steering system and power steering – how it works and what fails?, which can serve as a practical supplement to service knowledge.