Mercedes CLC CL203 Trunk Lid Tailgate Left N/S Wiring Cable Harness A2035406609

Mercedes CLC CL203 Trunk Lid Tailgate Left N/S Wiring Cable Harness is an original electrical component from the Wires, harnesses, and connectors group, designed to support circuits in the rear part of the body on the left side. It is a practical solution for users who want to restore full functionality to the trunk wiring in their Mercedes while maintaining the factory logic of cable and connector routing.

Specifications and technical data

• SKU: A2035406609
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2035406609
• Substitutable numbers: A2035406609, A 203 540 66 09, KD
• Location on the vehicle: Left
• Category: Wiring Harnesses, Cables & Connectors

Purpose and function of the trunk wiring harness

The presented harness is dedicated to installation on the left side of the luggage compartment, where it is responsible for power supply and signal transmission between the rear of the body and the rest of the vehicle's electrical system. This includes typical circuits routed in the trunk, such as lighting, selected sensors, or control elements, in accordance with the factory configuration of the CL203 model.

By maintaining the original cable routing, correct segment lengths, and properly selected connectors, the harness allows for organized installation without the need for electrical system modifications. This is particularly important in vehicles where previous repairs were performed using "shortcuts," leading to problems with diagnostics and connection durability.

Benefits of using an original Mercedes harness

Using a factory trunk harness in the CL203 model provides a number of practical advantages:

• compliance with the manufacturer's service documentation and electrical diagrams,
• correct placement of connectors within the left side of the trunk,
• reduced risk of installation errors compared to aftermarket or custom-made wiring,
• easier diagnostics of electrical faults in the future.

For workshops and private users, this means faster installation, fewer potential points of failure, and greater predictability of the electrical system's behavior. The original harness design also helps maintain the clarity of the installation in the trunk, which is important for future repairs or vehicle retrofitting.

Condition, origin, and service application

The item comes from a dismantled Mercedes vehicle, which allows for consistency with the factory manufacturing standard. This type of harness is particularly useful in situations where the installation has been damaged as a result of a rear-end collision, wire corrosion, interference in the trunk, or improper previous repairs.

Replacing the complete harness on the left side of the trunk is often a faster and more predictable solution than spot-soldering individual wires. This allows for the restoration of proper electrical connections, minimization of voltage drops, and avoidance of problems with unstable operation of lighting or equipment located in the rear of the vehicle.

Installation tips and fitment

Before installation, it is recommended to compare the shape, number of connectors, and routing of the harness with the currently installed component in the vehicle. Proper placement of wires in the factory guides and holders in the trunk reduces the risk of insulation abrasion and accidental crushing of the harness by equipment elements. Proper fitment to the specific CL203 body version is crucial for maintaining the full functionality of all circuits supported by the trunk wiring.

In the case of older vehicles where the availability of new components is limited, using a verified harness from dismantling is a reasonable compromise between repair cost and build quality. A properly selected element from the Wires, harnesses, and connectors group allows for the restoration of proper electrical system operation without the need for expensive modifications.

If you are planning a comprehensive repair or upgrade of the trunk area in your Mercedes and need other elements from the same group, such as wires, harnesses, or connectors, check the available parts in the Mercedes wires, harnesses, and connectors category.

When working on an older model and the availability of new components is limited, it is worth considering a wider use of verified parts from dismantling – you can find more practical tips in the article No parts at the dealership? How to deal with repairing older models using parts from dismantling.