Mercedes W639 Door Lock Latch Actuator Mechanism Front Right O/S A6397201535

Mercedes W639 Door Lock Latch Actuator Mechanism Front Right O/S A6397201535 is an original component from the Locks and Latches group, designed for installation on the passenger side. It ensures the proper operation of the central locking system, secure latching, and stable integration with the vehicle's electrical system. This solution is dedicated to users who expect reliable performance and compatibility with the factory door design.

Specifications and technical data

• SKU: rhd-A6397201535
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6397201535
• Substitutable numbers: A6397201535, A 639 720 15 35, KD
• Location on the vehicle: Front, Right
• Category: Exterior Locks & Lock Hardware

Purpose and function in the vehicle

The presented lock mechanism is designed for installation in the front right door of Mercedes W639 series models. It is responsible for:

• mechanical locking and unlocking of the door leaf,
• cooperation with the central locking system and remote control,
• correct positioning of the lock tongue relative to the body pillar,
• stable retention of the door in the closed position while driving.

Thanks to a design consistent with Mercedes factory standards, this component maintains the correct geometry of rods, handles, and actuators, which translates into repeatable and predictable lock operation in daily use.

Construction and technical compatibility

The front right door lock mechanism in the Mercedes W639 combines a mechanical part with a set of components that interface with the vehicle's electrical system. The design includes:

• a set of latches and levers responsible for locking,
• mounting points matched to the factory door panel,
• an interface for connecting to internal and external handle rods,
• adaptation for operation in areas exposed to vibrations and temperature changes.

Using an original solution from the Locks and Latches group allows for maintaining consistency with the factory safety system and avoiding fitment issues that often occur with universal parts.

Vehicle placement and installation aspects

The component is intended for installation in the front – right side of the vehicle area, which means it works with the passenger door in left-hand drive vehicles. Correct placement is crucial for:

• axial alignment of the lock relative to the striker in the pillar,
• proper routing of rods and cables inside the door,
• maintaining tightness and eliminating play when closing.

When replacing, it is recommended to follow the door trim removal sequence, disconnect the electrical system, and check the condition of guides and rods. This allows the new mechanism to operate smoothly, without excessive resistance or noise.

Part condition and benefits of using an original

The offered lock mechanism is a used part, sourced from dismantling, which allows for maintaining factory structural compatibility with the vehicle. In practice, this means:

• fitment to original mounting points in the door,
• proper cooperation with the central locking system and cabin controls,
• preservation of the lock operating characteristics intended by the manufacturer.

For Mercedes W639 users, this is a solution that allows restoring proper door operation after a lock failure, without the need to modify the installation or interfere with the door panel structure.

Expansion of the security system in Mercedes

If you are planning a comprehensive repair or upgrade of the door and security area in your Mercedes and need other components from the same group, such as latches, cylinders, or additional door mechanisms, check the available parts in the Mercedes Locks and Latches category.

For drivers interested in further improving ergonomics and driving comfort, especially in premium class vehicles, a guide on selecting interior equipment may be helpful – more information can be found in the article Personalization and ergonomics – when is it worth replacing the steering wheel with a premium model?.