Mercedes W220 Door Wiring Harness Rear Right Left N/O/S Keyless Go A2205400507

Mercedes W220 Door Wiring Harness Rear Right Left N/O/S Keyless Go is a specialized electrical installation component designed to support the keyless entry system in the vehicle's rear doors. The product belongs to the Wires, harnesses, and connectors category and has been engineered for precise signal and power delivery to the door modules. Thanks to its factory-spec design, the harness ensures stable operation of comfort electronics and the Keyless Go function in the rear section of the body.

Specifications and technical data

• SKU: A2205400507
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2205400507
• Substitutable numbers: A2205400507, A 220 540 05 07
• Location on the vehicle: Rear, Right, Left
• Part type: Wire Harness
• Category: Wiring Harnesses, Cables & Connectors

Application and vehicle function

The described harness is intended for installation in the rear doors on both the left and right sides, in the area where locks, actuators, sensors, and Keyless Go system components are located. It is responsible for:

• transmitting signals between door modules and the body wiring,
• powering actuators and sensors in the rear doors,
• integrating comfort functions with the keyless system,
• maintaining a stable electrical connection in an area subject to movement (opening and closing of doors). By being matched to the specific body generation, the harness maintains the correct wire routing geometry, which reduces the risk of chafing, kinking, and electronic interference.

Construction and technical features

The harness belongs to the Wires, harnesses, and connectors category, meaning it consists of a set of wires with appropriately selected cross-sections and connectors matched to the factory sockets in the doors and body. Characteristic features of this component include:

• dedicated connectors compatible with the vehicle's installation,
• appropriately selected wire lengths for the rear left and right sides,
• factory mounting points enabling correct harness routing,
• design adapted for compatibility with the Keyless Go system. Such a solution allows for installation without the need for modifying the wiring, soldering, or creating additional wire sections, which translates into a more trouble-free and repeatable installation.

Benefits of using an original harness

Using a dedicated door harness in a vehicle of this brand provides a number of practical benefits:

• Compatibility with factory electronics – proper pin and connector assignment minimizes the risk of communication errors in the comfort system.
• Reduction of Keyless Go issues – proper wire routing and correct shielding promote stable operation of the keyless system.
• Easier diagnostics – maintaining the original installation structure facilitates work for service centers and technicians.
• Consistency with body construction – the harness is matched to the geometry of the rear doors, which improves the durability of connections. Choosing such a component is particularly important in vehicles equipped with extensive comfort electronics, where the quality of wire connections has a direct impact on the car's daily functionality.

Condition and service purpose

The offered harness is an aftermarket component, intended primarily as a spare part for repairs of the installation in the rear doors. It is effective in situations where the existing harness has suffered mechanical damage, contact corrosion, or wire breakage in the door hinge area. Due to its factory origin and fitment for the specific model, the installation process is orderly, maintaining the original wire routing paths. This is a good solution for workshops specializing in the electronics of this brand's vehicles and for users who want to restore full functionality of the Keyless Go system in the rear of the vehicle.

Related products and technical knowledge

If you are planning a comprehensive repair or upgrade of the door electrical installation in your Mercedes and need other components from the same group, such as additional harnesses, wires, or connectors, check the available parts in the Mercedes Wires, harnesses, and connectors category. To better care for the durability of the electrical installation and other components sourced from dismantling, it is worth learning practical tips regarding operation and maintenance – you will find them in the article How to extend the service life of used car parts?.