Mercedes ML W166 Seat Backrest Wiring Harness Front Left Right N/O/S A1664407807

The Mercedes W166 2013 Wiring Harness is a factory original electrical system component designed for W166 series models from the 2013 model year. It is responsible for the stable connection of all key electrical consumers in the vehicle, ensuring proper communication between sub-assemblies and safe power supply to comfort and control systems.

Specifications and technical data

• SKU: A1664407807
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1664407807
• Substitutable numbers: A1664407807, A 166 440 78 07
• Location on the vehicle: Front, Left, Right
• Category: Wiring Harnesses, Cables & Connectors

Purpose and Function in the Vehicle

The Mercedes W166 2013 ELECTRICAL WIRING HARNESS is a complete set of wires specifically designed for this generation of premium class SUVs. This component forms the main skeleton of the electrical system, connecting control modules, sensors, consumers, and safety elements into a coherent, logical layout.

Appropriately selected wire gauges, connectors, and mounting points allow for secure routing of the harness within the body, minimizing the risk of chafing, short circuits, and signal interference. This ensures that comfort, safety, and drive systems can operate under stable power conditions.

Advantages of Using an Original Wiring Harness

Using an original harness in a Mercedes W166 offers a range of practical service and operational benefits:

• precise fit to factory mounting points and wire routing,
• compatibility with control modules and the electrical architecture of the specific model year,
• preservation of factory protection logic and circuit distribution,
• reduced risk of installation errors compared to universal solutions.

For premium class vehicles, maintaining the integrity of the entire electrical architecture is particularly important. An original wiring harness helps avoid problems with communication between control units, on-board network errors, or incorrect operation of driver assistance systems.

Professional Installation and Diagnostics

Replacing the wiring harness in a Mercedes W166 requires a precise approach: correct wire routing, proper connector engagement, and circuit checks after installation. It is recommended to perform this operation at a workshop experienced with installations in vehicles of this brand, which reduces the risk of subsequent malfunctions and speeds up the diagnostic process.

When working on the drivetrain and components interacting with the electrical system, it is also worth paying attention to the condition of mechanical parts. If your car has started making disturbing noises from the area of the drive axle, the following guide may be helpful: why a used OEM differential might be a better choice than an uncertain aftermarket part.

Why Choose a Part from Mercedes

A wiring harness developed by the vehicle manufacturer is designed for long-term, stable operation in a specific model. Consistency with service documentation facilitates diagnostics, and compliance with factory schematics allows for quick location of potential circuit breaks or damage.

For the user, this means a lower risk of unplanned vehicle downtime, predictable behavior of electronic systems, and easier cooperation with diagnostic testers. This is especially important in modern SUVs, where the electrical system supports extensive comfort, safety, and drive systems.

Summary

The wiring harness for the Mercedes W166 from 2013 is a key element of the vehicle's electrical infrastructure, ensuring proper power supply and communication between sub-assemblies. Choosing an original solution from Mercedes helps maintain high system reliability, facilitates servicing, and reduces the risk of future electronic problems.