Mercedes W221 Rear Door Wiring Loom Harness Cable Connector Left N/S A2215408707

Mercedes W221 Rear Door Wiring Loom Harness Cable Connector Left N/S is an original electrical installation component designed for the rear left section of the vehicle body. Thanks to its factory fitment for the W221 S-Class generation, the wiring harness ensures a consistent connection for all electrical receivers in the door and stable communication with the body control modules. It is a practical solution for users looking to restore full functionality of the door electronics after a collision, water damage, or wiring failure.

Specifications and technical data

• SKU: A2215408707
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2215408707
• Substitutable numbers: A2215408707, A 221 540 87 07
• Location on the vehicle: Rear, Left
• Part type: Wire Harness
• Category: Wiring Harnesses, Cables & Connectors

Purpose and function in the vehicle

The presented wiring harness belongs to the Wires, harnesses, and connectors category and is specifically designed for installation in the rear left door of the vehicle. It is responsible for transmitting signals and power between the door and the rest of the vehicle's electrical installation, supporting, among others, electrically controlled components, lighting, and communication with comfort modules. Its placement in the rear – left side area ensures that the harness is structurally matched to the geometry of the door and grommets, which reduces the risk of chafing, wire kinking, and subsequent circuit continuity issues.

Construction and fitment for Mercedes W221

As a component dedicated to the Mercedes brand, the rear door wiring harness has been developed in accordance with the manufacturer's factory standards. This means:

• appropriate wire length matched to the door and pillar construction,
• connectors compatible with original modules and equipment in the door,
• wire routing consistent with factory mounting points. Such a solution facilitates installation and allows for maintaining the original wiring path, which is essential for both reliability and subsequent electrical diagnostics.

Condition, origin, and benefits of use

The item is offered as used, which allows for an economical repair of the installation while maintaining original build quality. A harness from dismantling is a good solution in situations where:

• damage to the wires in the door grommet has occurred,
• the installation has been melted or cut,
• a complete section of wiring needs to be replaced after bodywork repairs. Using an original harness dedicated to the W221 minimizes the risk of compatibility issues that often arise when custom-making installations or using universal solutions.

Service comfort and installation aspects

The door harness intended for the rear left side is structurally prepared for installation in factory mounting points, which speeds up service work. A mechanic or auto electrician can:

• easily route the wires through the original grommets,
• seamlessly connect the plugs to the modules and equipment in the door,
• maintain compliance with the Mercedes W221 service documentation. Such fitment reduces repair time and decreases the risk of installation errors that could result in subsequent electrical faults.

Installation expansion and related components

If you are planning a comprehensive repair or upgrade of the electrical installation area in your Mercedes and need other components from the same group, such as additional door harnesses, wire sections, or installation connectors, check the available parts in the Mercedes Wires, harnesses, and connectors category. For users interested in the broader use of parts from dismantling in the field of automotive electronics, practical tips on working with modules and installations may be useful – you will find them in the article Driving pleasure for years – how to take care of iDrive systems and electronic modules in BMW 3 and 5 series models using parts from dismantling?, which discusses best practices for selecting and installing used electronic components.