Mercedes W639 W903 Tone Horn Signal Fanfare A6395400076

Mercedes W639 W903 Tone Horn Signal Fanfare is an original component from the Horns category, designed for use in Mercedes vehicles. The grey housing provides a neutral, factory-standard appearance, and the OEM design ensures secure mounting and proper operation within the acoustic signaling system.

Specifications and technical data

• SKU: A6395400076
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6395400076
• Substitutable numbers: A6395400076, A 639 540 00 76
• Color: Grey
• Category: Horns

Purpose and function of the horn signal

The Mercedes W639 W903 Tone Horn Signal Fanfare is responsible for generating a clear warning signal, essential for daily vehicle operation. The component works with the factory electrical system, steering wheel button, and circuit protection, ensuring a quick response when the horn is pressed.

Selecting the correct acoustic signal is important both from a safety perspective and for compatibility with the vehicle's electrical system. Using a component from the same model family allows for maintaining correct operating parameters and avoids issues with installation or incorrect sound output.

Construction, color, and fitment

The grey housing blends well with the engine bay and body components without introducing unnecessary visual contrast. The horn signal construction is prepared for installation in the factory-designated location, maintaining the correct orientation relative to airflow and protection against contaminants.

Original mounts and electrical connectors facilitate installation in the vehicle without the need for wiring modifications or custom brackets. As a result, the component can be efficiently connected by a mechanic or auto electrician while adhering to manufacturer standards.

Condition, verification, and service application

The item is offered as used, which in practice means an opportunity for an economical repair of the acoustic signaling system while maintaining original specifications. This type of part is suitable for:

• repairing a non-functional horn following an electrical or mechanical failure,
• restoring full vehicle functionality after a collision,
• servicing a system where the existing horn signal has been damaged or corroded.

Selecting a component from the same model family facilitates compatibility with factory brackets, wiring harnesses, and the vehicle's electrical protection systems.

Benefits of using an original horn

Using a horn signal dedicated to Mercedes allows for maintaining the consistency of the electrical system and avoiding problems typical of aftermarket replacements with uncertain parameters. The most important advantages include:

• secure fitment to the installation and mounts provided by the manufacturer,
• maintaining the correct volume level and sound characteristics,
• reducing the risk of electrical protection malfunctions.

For users who want to keep their vehicle in a configuration close to factory standards, choosing an original horn signal is a technically sound and service-convenient solution.

Related components and additional information

If you are planning a comprehensive repair or upgrade of the acoustic signaling area in your Mercedes and need other elements from the same group, such as additional signals, brackets, or power harnesses, check the available parts in the Mercedes Horns category.

For drivers interested in a broader approach to vehicle diagnostics and optimal selection of drivetrain components, practical tips on assessing wear and selecting parts, available in the article Clutch and dual-mass flywheel – diagnostics and selection of drivetrain components, may be useful.