Mercedes Vito Viano W639 Wiper Motor Rear Window Tailgate Motor A6398200408

Mercedes Vito Viano W639 Wiper Motor Rear Window Tailgate Motor is an original component from the Wiper motors and linkages group, designed for operation in the rear section of the vehicle body. It ensures stable drive for the wiper arm, which translates into safe rear visibility during daily use. This solution is dedicated to users who expect a proven design and correct compatibility with the factory electrical system.

Specifications and technical data

• SKU: A6398200408-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6398200408
• Substitutable numbers: A6398200408, A 639 820 04 08, KD
• Location on the vehicle: Rear
• Category: Wiper Linkages, Transmissions & Motors

Purpose and function in the vehicle

The presented motor operates in the tailgate area, responsible for driving the rear window wiper. Its task is to precisely transfer torque to the wiper mechanism so that the arm movement is smooth, uniform, and synchronized with the factory controls. As a result, the window cleaning system maintains proper efficiency both during rainfall and in road dirt conditions.

Construction and technical fitment

The rear window wiper motor in the Mercedes Vito and Viano W639 has been designed as a component that works with the original mounting in the tailgate and the factory electrical harness. The design provides appropriate sealing at the mounting point, which limits the impact of moisture and contaminants on the drive's operation. The mechanical and electrical solutions used are optimized for the operating characteristics of the wiper in commercial and passenger-commercial vehicles.

By maintaining factory mounting parameters, the motor allows for installation without the need for modifications to brackets or the electrical system. This facilitates service and reduces replacement time, which is important for both workshops and fleet users.

Benefits of using an original wiper motor

• Compatibility with the electrical system – correct cooperation with factory wiper controls and vehicle installation.
• Stable operation in the rear of the vehicle – drive adapted to the loads and operating conditions on the tailgate.
• Reduced risk of installation problems – original mounting points and geometry preserved.
• Possibility of using the existing wiper arm and mechanism, if their condition allows.

The element from this group is particularly important in vehicles used intensively, where an efficient rear window wiper affects the safety of maneuvering, reversing, and observing the space behind the vehicle.

Characteristics of the used component

The offered motor comes from dismantling and is intended for users looking for a reasonable compromise between cost and functionality. In the case of this type of component, it is crucial to maintain proper mechanical and electrical operation, which allows for further vehicle use without the need to invest in a new subassembly. This type of solution is often chosen by workshops specializing in servicing Mercedes Vito and Viano models, as well as by fleet users who optimize vehicle maintenance costs.

To better understand the specifics of selecting used drive components and the principles of their verification, it is worth reading our expert guide: Why it is worth buying used gearboxes and engines – facts instead of myths. Although the article focuses on larger assemblies, it discusses universal procedures for selection by OEM numbers and a practical approach to evaluating used parts.

Expanding Mercedes wiper system service

Replacing the rear wiper motor is a good time to comprehensively assess the condition of the entire system – the arm, joints, output shaft, and seals in the tailgate. This helps avoid a situation where the newly installed drive works with an excessively worn mechanism, which could shorten its service life. If you are planning a comprehensive repair or modernization of the rear window visibility zone in your Mercedes and need other elements from the same group, such as drives, gears, or wiper linkages, check the available parts in the Mercedes wiper motors and linkages category.

Summary

Mercedes Vito Viano W639 Wiper Motor Rear Window Tailgate Motor is a practical solution for users expecting correct rear wiper operation while maintaining reasonable service costs. The original design, fitment to the tailgate, and cooperation with the factory control system make it a functional choice when repairing the wiper system in these Mercedes models.