Mercedes W205 Front Door Wiring Loom Harness Cable Right O/S Side A2055408940

Mercedes W205 Front Door Wiring Loom Harness Cable Right O/S Side is an original electrical installation component designed for the front right door in W205 series models. Thanks to its factory-fit design, the wiring harness ensures proper connection of all electrical components in the door and stable communication with the vehicle's body wiring. It is a practical solution for replacing damaged wiring, post-accident repairs, or restoring full functionality to door equipment.

Specifications and technical data

• SKU: A2055408940
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2055408940
• Substitutable numbers: A2055408940, A 205 540 89 40
• Location on the vehicle: Front, Right
• Part type: Wire Harness
• Category: Wiring Harnesses, Cables & Connectors

Purpose and vehicle placement

The presented wiring harness is intended for installation in the front right door of Mercedes W205 class vehicles. It is responsible for connecting the components located in the door to the main vehicle body electrical system, in accordance with the manufacturer's factory standards. Placement in the front-right zone of the vehicle allows for precise routing of the cables through original mounting points, which reduces the risk of abrasion, short circuits, and device malfunctions.

Function and role in the electrical system

The door wiring harness in the Mercedes W205 is a key communication element between body modules and door equipment. It is responsible for, among other things:

• transmitting control signals to components located in the front right door,
• powering electrical consumers in this zone,
• stable connection with body control modules via factory connectors. By using an original harness from the Wires, harnesses and connectors group, compliance with the factory electrical diagram is maintained, which facilitates diagnostics, service, and subsequent equipment modifications.

Benefits of using an original wiring harness

Choosing an original door wiring harness for the Mercedes W205 allows you to maintain the consistency of the installation with the manufacturer's service documentation. This solution is particularly beneficial for:

• repairs after mechanical damage or corrosion of wires in the door grommet,
• restoring the installation after unprofessional modifications,
• restoring full functionality of door electrics after failures. The original design of the harness minimizes the risk of installation errors, eliminates the need for custom-made connections, and allows for maintaining proper cable routing in factory clips. This translates into stable operation of electrical systems and reduces the risk of future faults resulting from improper installation.

Product characteristics and condition

The offered harness belongs to the body electrical installation group and is classified in the Wires, harnesses and connectors category. The product comes from dismantling, which means it is a used part that retains the factory geometry, connector types, and wiring layout consistent with the solutions used by the manufacturer. This type of component is particularly useful in situations where maintaining the original electrical architecture without the need to build the installation from scratch is required.

Application in service and repairs

The front right door wiring harness for the Mercedes W205 will work well in both professional service centers and workshops specializing in the Mercedes brand. It facilitates:

• efficient replacement of damaged wiring within the front right door,
• restoration of proper operation of electrical door functions,
• maintaining compliance with the vehicle's factory electrical diagrams. Thanks to the preservation of the original configuration of wires and connectors, the installation proceeds in an orderly manner, and the risk of incorrect connection is limited. This is especially important in modern vehicles, where the door installation interacts with many control modules. If you are planning a comprehensive repair or upgrade of the front door zone in your Mercedes and need other elements from the same group, such as sections of door installation, harness connectors, or additional cable branches, check the available parts in the Mercedes Wires, harnesses and connectors category. If you are also considering repairs within the drivetrain and want to better evaluate the cost-effectiveness of using used parts, it is worth familiarizing yourself with practical tips – the article Manual transmission failures in cars – why an original used part is a more sensible choice than regeneration? will be helpful, as it shows a broader context for selecting original components from dismantling.