Mercedes W639 Sliding Door Lock Actuator Mechanism Rear Left N/S A6397300635

Mercedes W639 Sliding Door Lock Actuator Mechanism Rear Left N/S is a precision component from the Interior locks and latches group, designed for the rear left body section. It ensures secure locking of the sliding door, stable operation of the mechanism, and proper interaction with the factory locking system in Mercedes vehicles.

Specifications and technical data

• SKU: A6397300635-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6397300635
• Substitutable numbers: A6397300635, A 639 730 06 35
• Location on the vehicle: Rear, Left
• Category: Exterior Locks & Lock Hardware

Purpose and function in the vehicle

The presented lock actuator is dedicated to operating the sliding door in the rear left part of the body. It is responsible for:

• mechanical locking and unlocking of the door leaf,
• cooperation with the central locking system and the vehicle's electrical installation,
• maintaining a stable door position during driving and while parked.

Thanks to its precise fit to the Mercedes W639 design, this component allows for restoring the proper operation of the sliding door without the need to interfere with factory solutions.

Construction and technical fitment

The sliding door lock actuator has been designed as a part that works with the original wiring and body mounts. The construction provides:

• dedicated mounting points in the rear left part of the vehicle,
• integrated electric drive responsible for the latch operation,
• compatibility with the factory lock control system.

Such a solution facilitates installation and reduces the risk of play, noise, or improper door closing, which translates into stable and repeatable mechanism operation.

Product condition and benefits of choosing a used part

The offered lock actuator comes from a used vehicle, which allows you to combine original specifications with an attractive price. This type of part is particularly beneficial when you want to:

• maintain factory fitment to the body and electrical installation,
• reduce repair costs while maintaining OEM quality,
• quickly replace the component without the need for modifications.

A used sliding door lock actuator is a sensible choice when the existing mechanism has worn out, causes closing problems, or does not work properly with the central locking system.

Why it is worth using a dedicated lock actuator

Using the correct lock actuator in the rear left part of the Mercedes W639 helps avoid typical operational problems, such as irregular locking, the need to push the door, or errors in the locking system. Key advantages include:

• Proper fitment with the sliding door construction,
• maintaining the correct latch operating geometry,
• compatibility with factory lock controller settings.

Thanks to this, you restore the comfort of using the sliding door and reduce the risk of further damage to cooperating elements, such as guides or handles.

Repair scope expansion and related components

If you are planning a comprehensive repair or modernization of the side sliding door area in your Mercedes and need other elements from the same group, such as locking mechanisms, actuators, or additional control modules, check the available parts in the Mercedes interior locks and latches category.

If you are considering a wider use of aftermarket components and want to better understand the advantages of such solutions, the article describing the key benefits of using used subassemblies in premium class cars may be helpful – you can find it here: Used parts for BMW – is it worth it? Key benefits for brand fans.