Mercedes Vito Viano W639 Headlight Switch Unit Button Knob A6395450104

Visual condition of the part

The product shows signs of use visible in the photos.

Mercedes Vito Viano W639 Headlight Switch Unit Button Knob is a factory-original component from the Switches, control elements and ignition switches category, designed for operating the exterior lighting in Mercedes vehicles. The offered module comes from a vehicle dismantling process, which allows for maintaining the original functionality of the electrical system and consistency with the factory interior equipment.

Specifications and technical data

• SKU: A6395450104
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6395450104
• Substitutable numbers: A6395450104, A 639 545 01 04
• Category: Switches & Controls

Function and application of the headlight switch

The headlight switch in Vito and Viano W639 models is responsible for precise control of driving and parking lights, integrating seamlessly with the vehicle's electrical system. As an OEM component, it ensures proper cooperation with the lighting control system, the dashboard, and other comfort modules, without the need for wiring modifications or adaptations.

Thanks to the original design, installation is carried out in the factory location, maintaining operational ergonomics and the legibility of the markings on the panel. This solution is particularly beneficial for post-collision repairs, mechanical damage to the knob, or issues with unreliable contact in an old switch.

Benefits of using an original Mercedes component

Choosing an original headlight switch for a Mercedes allows you to maintain the consistency of electrical parameters with the rest of the installation. The appropriate contact characteristics, connector fitment, and correct circuit resistance minimize the risk of errors in the diagnostic system and unwanted messages on the instrument cluster.

The offered element, as a used part, provides an economical alternative to a new component while maintaining factory specifications. It is a practical solution for workshops and individual users who want to restore full lighting functionality without interfering with the vehicle's original electrical architecture.

Integration with the control system and installation

The headlight switch is structurally prepared for installation in the factory socket in the dashboard, which facilitates service and reduces replacement time. The use of the original housing and connectors eliminates the need for adapters, soldering wires, or modifying the cockpit panel.

In practice, installation comes down to removing the old module, connecting the factory wiring harness, and seating the switch in its working position. This solution is particularly beneficial for service centers specializing in the Mercedes brand, where repair repeatability, predictable results, and limiting potential sources of electrical faults are essential.

Why choose used original Mercedes components

In the case of Mercedes-Benz vehicles, using used but original control elements allows you to maintain a high level of comfort and functionality at reasonable service costs. You can find more about the advantages of such solutions, including the selection of components from dismantling and their impact on vehicle operation, in the article Used parts for Mercedes – original components from dismantling.

Expanding repairs within the lighting control area

If you are planning a comprehensive repair or upgrade of the lighting control zone in your Mercedes and need other elements from the same group, such as additional switches, control modules, or ignition switch components, check out the available parts in the Mercedes switches, control elements and ignition switches category.