Mercedes W177 W243 W247 Rear Door Wiring Harness Cable Left N/S A1775402811

Mercedes W177 W243 W247 Rear Door Wiring Harness Cable Left N/S is an original electrical installation component designed for the rear left door wing in selected Mercedes models. Thanks to the factory fit and the maintenance of proper signal and power routing, the harness ensures stable operation of the door electronics and reduces the risk of faults resulting from improper connections. This is a solution for users who want to maintain OEM installation consistency without modifications or quality compromises.

Specifications and technical data

• SKU: A1775402811
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1775402811
• Substitutable numbers: A1775402811, A 177 540 28 11
• Location on the vehicle: Rear, Left
• Category: Wiring Harnesses, Cables & Connectors

Purpose and function in the vehicle

The presented wiring harness is designed for installation in the rear left door area, where it is responsible for transmitting power and control signals between the door and the rest of the vehicle's installation. This includes typical circuits used in doors, such as power supply for receivers, control lines, and signal wires, which allows for maintaining full functionality of the door equipment after replacing a damaged harness.

Thanks to the factory fit for a specific body zone, the installation proceeds in an orderly manner, maintaining proper wire routing paths and mounting points. This minimizes the risk of insulation abrasion, unwanted tension, and interference in the operation of electrical components.

Advantages of using an original Mercedes harness

Using an original wiring harness in the rear left door allows for maintaining the electrical and mechanical parameters specified by the vehicle manufacturer. In practice, this means:

• secure connections with factory connectors in the door and body,
• properly selected wire cross-sections for current loads,
• correct shielding and routing of signal lines,
• compatibility with factory diagnostic systems.

Such a solution is particularly beneficial in vehicles equipped with extensive comfort and safety systems, where stability of electrical communication has a direct impact on the correct operation of control modules.

Product characteristics and installation

The harness belongs to the Wires, harnesses, and connectors group, which means it was designed as an integral part of the body's electrical installation. The design provides for factory connectors, appropriately shaped wire sections, and mounting points, which facilitates installation in the original routing locations.

When replacing, it is recommended to:

• compare the wire routing with the removed harness,
• check the condition of sockets and connectors on the body and door side,
• carefully install in factory holders to avoid twisting or excessive bending of the wires.

Such an approach allows for maintaining the durability of connections and reducing the risk of subsequent problems with circuit interruptions during door opening and closing.

Why choose a used OEM harness

A used OEM door wiring harness is a solution that combines controlled costs with the maintenance of factory specifications. Unlike universal replacements, the original component is prepared exactly for a given vehicle area, which eliminates the need for modifications and wire shortening. For many users, this is the simplest way to restore full functionality of the door electronics after damage or wire corrosion.

If you want to better understand when choosing a used factory component is more beneficial than a replacement, the following article will be helpful: 5 reasons why a used OEM part is a better choice than a replacement. You will find practical tips and criteria for selecting parts based on real examples.

Expansion of the installation within Mercedes wires and harnesses

If you are planning a comprehensive repair or modernization of the body's electrical installation zone in your Mercedes and need other components from the same group, such as additional door harnesses, wire sections, or dedicated connectors, check the available parts in the Mercedes wires, harnesses, and connectors category.