Mercedes W213 Rear Door Wiring Harness Keyless Left Right N/O/S A2135406831

Mercedes W213 Rear Door Wiring Harness Keyless Left Right is an original electrical installation component designed for the rear of the vehicle body, on both the left and right sides. As part of the Wires, harnesses, and connectors category, this product ensures a proper electrical connection between the door and the vehicle body, which translates into stable operation of the door equipment. Thanks to its factory origin, the harness maintains the correct geometry, segment lengths, and compatible connectors.

Specifications and technical data

• SKU: A2135406831
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2135406831
• Substitutable numbers: A2135406831, A 213 540 68 31
• Location on the vehicle: Rear, Right, Left
• Category: Wiring Harnesses, Cables & Connectors

Purpose and function in the vehicle

The presented wiring harness is dedicated to the rear of the car, on both the left and right sides, for the Mercedes W213 model. It is responsible for transmitting signals and power between the door and the main vehicle body electrical system, supporting, among other things, electrically operated components, lighting, and signals from sensors located in the doors.

Factory-standard wire routing and proper connector placement reduce the risk of chafing, interference, and poor contact, which is essential during intensive vehicle use. A correctly selected harness facilitates installation and allows for maintaining the original routing of the installation in the rear doors.

Construction and installation compatibility

The harness has been designed specifically for the W213 body, taking into account the geometry of the rear doors and the grommets between the door and the pillar. The connectors used are matched to the factory sockets in the door and body, which enables installation in a plug-and-play manner, without the need to modify the installation.

The arrangement of wires and mounting points is consistent with the manufacturer's original design, which:

• facilitates routing the harness in factory channels and holders,
• minimizes the risk of mechanical damage during door operation,
• ensures stable electrical connections over a long service life.

Characteristics of the used component

The offered harness is a used component sourced from dismantling, which allows for maintaining compatibility with the vehicle's original installation while optimizing repair costs. This type of component is particularly useful in cases of mechanical damage to wires, broken harnesses in the door grommet, or electrical communication problems in the rear of the vehicle body.

Choosing an original harness from dismantling reduces the risk of connector mismatch, differences in wire lengths, or pin incompatibility that may occur with universal aftermarket replacements.

Benefits of using the dedicated Mercedes W213 harness

Using this wiring harness in the rear doors provides a number of practical benefits:

• maintaining the factory logic of the electrical installation in the rear of the vehicle,
• easier diagnostics of potential faults thanks to the original wiring layout,
• consistency with other electrical components in the W213 model,
• reduced installation time thanks to matched connectors and wire lengths.

For workshops and private users, this means faster repair completion and a lower risk of compatibility issues after installation.

Related Mercedes electrical installation components

If you are planning a comprehensive repair or upgrade of the door electrical installation zone 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 a better understanding of the relationships between individual vehicle system components and the influence of the electrical installation on drivetrain operation, it is worth reading the technical guide: Clutch and dual-mass flywheel – diagnostics and selection of parts for the drivetrain.