Mercedes W177 Door Harness Loom Cable Wiring Rear Left Right N/O/S A1775405501

Mercedes W177 Door Harness Loom Cable Wiring Rear Left Right is an original electrical installation component designed for the rear part of the vehicle body, on both the left and right sides. Thanks to its factory geometry and connectors tailored to Mercedes standards, the harness allows for the efficient restoration of full door electrical functionality without the need for modifications. This solution is particularly beneficial for post-accident repairs, door replacements, or addressing damage to the installation in the rear zone of the vehicle.

Specifications and technical data

• SKU: A1775405501
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1775405501
• Substitutable numbers: A1775405501, A 177 540 55 01
• Location on the vehicle: Rear, Right, Left
• Category: Wiring Harnesses, Cables & Connectors

Purpose and vehicle placement

The presented harness belongs to the Wires, harnesses, and connectors group and has been designed for installation in the rear part of the body, on both the left and right sides. It is responsible for transmitting signals and power between the vehicle's main installation and modules located in the rear doors, such as window controls, central locking, or auxiliary lighting (depending on the specific vehicle's equipment).

The placement on the vehicle covers the area of the transition between the body and the rear doors, where resistance to bending, twisting, and temperature changes is particularly important. Using a dedicated harness allows for maintaining the correct routing of wires and minimizes the risk of abrasion or damage resulting from improper installation.

Technical and functional characteristics

As an original component for the Mercedes brand, the wiring harness ensures compatibility with the vehicle's factory electrical architecture. Properly selected wire cross-sections, insulation types, and connector designs are adapted to the current loads and requirements of the systems used in the W177 model. As a result, the stability of electrical parameters and proper cooperation with control modules are maintained.

The harness has been prepared for operation in the demanding environment of the rear doors, where frequent opening and closing movements occur. The construction of the wires and their layout limit mechanical stress, which translates into a longer service life of the installation and a lower risk of failures related to circuit breakage.

Benefits of using an original harness

Using a dedicated wiring harness in the rear part of the vehicle brings a number of practical benefits:

• maintaining the factory routing of the electrical installation in the rear doors,
• secure fit of connectors to the original sockets in the vehicle,
• reduction of the risk of assembly errors typical of universal solutions,
• stable operation of electrical systems associated with the rear doors,
• easier diagnostics of potential faults in the future.

For users and service centers repairing Mercedes vehicles, this means faster assembly, predictable system behavior, and compliance with the manufacturer's technical documentation.

Component condition and service application

The offered wiring harness comes from the secondary market, which makes it an attractive cost-effective solution while maintaining factory design and compatibility. This is particularly important in the case of repairs where matching the specific model and limiting interference with the vehicle's original installation is crucial.

The component will prove useful both when replacing a damaged harness in one of the rear doors and during a comprehensive reconstruction of the installation in the rear part of the body, e.g., after a collision or wire corrosion. Choosing an original harness allows you to avoid improvised connections that could lead to unstable operation of electrical systems.

Expanding the installation in the rear part of the vehicle

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

For modernization or tuning projects where you use secondary market components, it is also worth paying attention to good practices for component selection. To better prepare for such modifications and avoid common problems, check out the tips in the article Buying used car parts • Most common mistakes when choosing tuning parts.