Mercedes W639 Electric Sliding Roof Switch Control Button A6396950457

Visual condition of the part

The product shows signs of use visible in the photos.

Mercedes W639 Electric Sliding Roof Switch Control Button is an original control component designed to operate the sunroof in the rear part of the vehicle. This specialized button ensures precise control of the roof movement on either the right or left side, maintaining the factory operating logic and consistency with the Mercedes electrical system. Thanks to the OEM design, it is a convenient, functional solution that is tailored to the factory comfort system.

Specifications and technical data

• SKU: A6396950457-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6396950457
• Substitutable numbers: A6396950457, A 639 695 04 57
• Location on the vehicle: Rear, Right, Left
• Category: Switches & Controls

Function and application of the roof switch in the Mercedes W639

The Mercedes W639 Electric Sliding Roof Switch Control Button is responsible for controlling the opening and closing of the sunroof in the rear of the vehicle. This component works with the factory comfort module, enabling:

• smooth movement of the roof in the selected direction,
• precise stopping at an intermediate position,
• intuitive operation for passengers in the rear of the cabin.

Thanks to its dedicated placement in the rear zone, on the right or left side, the switch allows for maintaining interior ergonomics and convenient access for users.

Construction and integration with the control system

The switch belongs to the Switches, control elements and ignition switches group, which means it is designed to work in the vehicle's low-voltage electrical environment and interacts with other components of the control system. The design provides:

• a dedicated electrical connector matched to the Mercedes wiring harness,
• a button mechanism optimized for repetitive use,
• clear, intuitive operating logic consistent with the brand's factory standards.

Such a solution facilitates installation in the location provided by the manufacturer and reduces the risk of installation errors.

Vehicle placement and installation aspects

The element is intended for installation in the rear of the cabin, with the possibility of use on the right or left side, depending on the interior configuration. Thanks to this, it is possible to:

• restore the original roof control layout in the vehicle,
• provide passengers with convenient access to sunroof operation,
• maintain visual and functional consistency with other switches in the Mercedes.

With proper selection for a specific equipment version, installation comes down to seating the switch in the factory socket and connecting it to the existing wiring harness.

Characteristics of the Mercedes brand and control group

Original control solutions in Mercedes vehicles are designed for long-term operation and maintaining the consistency of the entire comfort system. The Mercedes W639 Electric Sliding Roof Switch Control Button fits into this philosophy, offering:

• compliance with factory safety and ergonomics standards,
• stable cooperation with the vehicle's electrical system,
• preservation of the original sliding roof functionality without the need for installation modifications.

This solution is particularly beneficial during repairs when one wants to maintain a uniform standard of equipment and avoid non-original modifications.

Why choose this switch for your W639

Choosing a dedicated Mercedes W639 Electric Sliding Roof Switch Control Button allows you to restore full sunroof functionality in the rear of the vehicle, without compromises in terms of ergonomics and compatibility. It is a practical solution for users who expect:

• consistent operation with other control elements in the interior,
• preservation of the original character of the passenger cabin,
• reliable, repeatable roof control on the right or left side.

If you are planning a comprehensive repair or upgrade of the comfort control area in your Mercedes and need other elements from the same group, such as window buttons, mirror adjustment knobs, or switch modules, check the available parts in the Switches, control elements and ignition switches Mercedes category.

For users who are simultaneously servicing the braking system and considering the purchase of used components, a guide describing the safe selection of elements such as discs, calipers, or the ABS system may be helpful – detailed tips can be found in the article Braking system second-hand: how to safely choose discs, calipers and ABS?.