Mercedes-Benz C W204 Rear Left N/O/S Right Door Wiring Loom Harness A2045407609

Description

MERCEDES C W204 Door Wiring Harness Right Left Rear is an original electrical installation component from the Wires, Harnesses, and Connectors category, designed for installation in the rear right and left doors. The product ensures factory-standard signal and power routing within the doors, leading to stable electrical operation and proper communication with body modules.

Specifications and technical data

• SKU: A2044401005
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2045407609
• Substitutable numbers: A2045407609, A 204 540 76 09, A2044401005, A 204 440 10 05
• Location on the vehicle: Rear, Right, Left
• Category: Wiring Harnesses, Cables & Connectors

Vehicle Application and Placement

This wiring harness is specifically designed for installation in the vehicle’s rear doors, with dedicated routing for both the right and left sides. It is responsible for connecting the electrical components within the doors to the vehicle’s body wiring, which is crucial for the correct functioning of features such as power windows, central locking, and door lighting (depending on the specific car’s equipment).

Thanks to its factory-matched fit to the door and body pillar structure, the harness is routed in the locations intended by the manufacturer, minimizing the risk of insulation abrasion, wire strain, and subsequent electrical connectivity issues.

Design and Benefits of a Factory Harness

As a component originating from the Mercedes brand, this door wiring harness is manufactured according to the vehicle manufacturer’s requirements regarding wire cross-sections, insulation type, and resistance to bending at the door hinge. This translates to:

• stable electrical parameters across the entire length of the wires,
• appropriate flexibility at the transition points between the door and the body,
• compatibility with factory connectors and sockets in the door and pillar.

The harness is configured for specific connector placement, which simplifies installation and minimizes the risk of errors when connecting individual circuits. Proper wire length and factory mounting points help maintain order in the installation and facilitate potential future service work.

Product Condition and Service Application

This item is offered as a used part, allowing for economical repair of the electrical installation while maintaining the original manufacturer’s specifications. It is a practical solution for situations where the existing harness has suffered mechanical damage (e.g., broken wires in the door grommet) or when signal interruption occurs during door opening and closing.

Replacing with a factory rear door wiring harness is particularly recommended when:

• multiple “splice” repairs have been identified, reducing installation reliability,
• difficult-to-diagnose electrical faults are present within the rear doors,
• it is necessary to restore the original wire routing after bodywork repairs.

Why Choose the Mercedes C W204 Door Harness

Selecting the correct door wiring harness directly impacts vehicle usability and the stability of electrical systems. Using an original solution dedicated to the rear of the body on both sides ensures:

• consistency with the vehicle’s factory electrical architecture,
• proper fitment with connectors and control modules,
• reduced risk of communication errors within the vehicle network.

This is particularly important in modern vehicles where various body modules communicate via data buses, and the quality of wire connections affects the proper functioning of the entire system.

Other Mercedes Wires, Harnesses, and Connectors

If you also need other electrical installation components, such as additional body harnesses, connectors, or wires specific to this brand, check out our offer for Mercedes wires, harnesses, and connectors, where you will find a wide selection of components tailored to various models.

For drivers considering purchasing parts from the secondary market, general tips on selecting used components may also be useful – you can find more on this topic in the article on the benefits of choosing used parts and the principles of their safe selection, which helps to approach vehicle refurbishment and repair consciously.