Mercedes-Benz C E W204 W207 W212 Heater Matrix Electrical Wiring Cable Harness

Mercedes-Benz C / E W204 W207 W212 Rear Heater Wiring Harness is an original part from the Cables, Harnesses, and Connectors group, designed to service the rear heating system of the vehicle. Engineered by the manufacturer for specific Mercedes models, it ensures proper signal and power routing, thus guaranteeing stable operation of the heating system.

Specifications and technical data

• SKU: rhd-A2128202913
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2128202913
• Substitutable numbers: A2128202913, A 212 820 29 13, BG
• Location on the vehicle: Rear
• Category: Wiring Harnesses, Cables & Connectors

Application and Function in the Vehicle

This wiring harness is dedicated to the rear body heater system, where it is responsible for secure electrical connections between control elements and heating components. Thanks to its factory fitment for C-Class and E-Class models series W204, W207, and W212, the correct wire routing geometry and compatibility with original connectors are maintained.

The component is designed as part of the thermal comfort system, therefore its proper functioning directly impacts the heating efficiency of the rear cabin area and the reliability of the entire electrical installation in this zone.

Construction and Installation Fit

The harness belongs to the Cables, Harnesses, and Connectors category, meaning it is constructed for stable wire routing, appropriate shielding, and correct wire gauge selection for the heating system's current loads. The connectors used are factory-matched to the sockets in the Mercedes installation, which facilitates installation and minimizes the risk of connection errors.

The original construction ensures:

• factory-compliant harness routing in the rear of the vehicle,
• secure clips and mountings at manufacturer-designated points,
• adequate wire length reserve in areas of movement or vibration exposure.

Benefits of Using an Original Harness

Using the original rear heater harness in a Mercedes offers a range of practical operational benefits:

• Full Electrical Compatibility – correct wire gauges and pin configurations limit the risk of overheating, voltage drops, and control errors.
• Stable Heating System Operation – proper electrical connections promote uniform and predictable operation of the rear cabin heater.
• Easier Diagnostics – maintaining the factory harness routing simplifies the work of diagnosticians and service centers, reducing potential repair times.
• Safe Operation – original connectors and insulation reduce the risk of short circuits, chafing, and thermal damage.

Characteristics of a Used Part

The offered harness is a used part, sourced from disassembly, which allows combining original fitment with an attractive price compared to a new component. For many Mercedes C-Class and E-Class owners, this is a sensible way to restore the functionality of the rear heater system while maintaining factory quality of workmanship.

For installation, standard service procedures are recommended: checking the condition of the insulation and connectors, and correctly routing the harness at manufacturer-designated mounting points to avoid mechanical stress and contact with high-temperature components.

Expanding Electrical System Modernization

If you are planning a comprehensive repair or modernization of the rear electrical system in your Mercedes and need other parts from the same group, such as additional harnesses, power cables, or service connectors, check the available parts in the Mercedes Cables, Harnesses, and Connectors category.

For larger jobs involving the disassembly of interior or body components, it is also worth familiarizing yourself with practical tips on using salvaged parts – you can find them in the article Body and Chassis – Accident Repairs Using Salvaged Parts, which discusses best practices for selecting and installing used OEM components.