Mercedes S204 W204 Door Wiring Loom Harness Front Right O/S A2044405535

Mercedes S204 W204 Door Wiring Loom Harness Front Right O/S is an original electrical installation component designed for the passenger side door in C-Class models. Thanks to its factory-fit design for the S204/W204 body, the harness ensures proper connection of all electrical components in the door, such as window controls, locks, or mirrors. Using this OEM component allows for a technically correct repair without the need for any modifications to the installation.

Specifications and technical data

• SKU: RHD-A2044405535
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2044405535
• Substitutable numbers: A2044405535, A 204 440 55 35
• Location on the vehicle: Front, Right
• Category: Other Starters, Alternators, ECUs & Wiring

Purpose and vehicle placement

The presented wiring harness is designed for installation in the front right door of Mercedes S204/W204 family vehicles. It is responsible for transmitting signals and power between the body wiring and the modules located in the door, which is crucial for the stable operation of the electrical system in this area.

The vehicle placement defined as front – right side means that the harness is structurally matched to the specific side of the body, with the appropriate wire length, connector layout, and door/pillar grommets.

Key technical features of the harness

The door harness for the S204/W204 has been manufactured in accordance with the manufacturer's standards, which translates into:

• factory connectors compatible with modules and door equipment,
• appropriate wire cross-section selected for electrical loads,
• mounting and routing points as specified by the manufacturer,
• maintenance of proper positioning in the grommet between the pillar and the door.

As a result, the installation process is orderly, and the risk of mechanical damage to the wires during door operation is minimized.

Application in door installation repairs

The front right door wiring harness is particularly useful in situations where the vehicle experiences:

• interruptions in the operation of electric windows or central locking on the right side,
• problems with power supply to mirrors or door lighting,
• wire damage in the grommet resulting from years of use.

Using an original harness allows for restoring proper circuit continuity without the need for splicing wires, soldering, or using non-original connectors, which is a more predictable solution in terms of reliability.

Characteristics of the used product

The item comes from a dismantled Mercedes vehicle, thanks to which it retains the factory wire routing geometry and original connectors. A used harness is a good choice for budget-friendly repairs where it is important to combine reasonable cost with maintaining compatibility with the vehicle's installation. Before installation, it is recommended to perform a standard inspection of the insulation and contact condition for any signs of wear.

Compatibility and part selection

To correctly select the door harness for a specific body version and equipment level, it is worth paying attention to the manufacturer's markings and connector configuration. The product has an assigned OEM part number and interchangeable numbers, which facilitates verification of compatibility with your vehicle in service catalogs or with a technical advisor.

If you are planning a comprehensive repair or upgrade of the body electrical installation in your Mercedes and need other elements from the same group, such as additional harnesses, connectors, or control modules, check the available parts in the Other Mercedes category.

For drivers interested in comparing technical solutions used in different brands and sports versions, including engines, brakes, and chassis, the article on our blog may be helpful: Audi RS vs other models – what is hidden under the hood and chassis?.

If you are considering a wider replacement of body or installation elements using components from dismantling, it is worth reading our guide on the quality of used body parts and equipment: Replacing body elements with used ones – can body parts from dismantling look like new?.