Mercedes W177 Remote Key Radio Alarm Fob Button A1779056104

Mercedes W177 Remote Key Radio Alarm Fob Button is an original component from the Switches, controls and ignition locks group, designed for remote vehicle function control. The offered item is marked as For parts or not working, making it an excellent donor for components, housing, or buttons when repairing other key fobs in Mercedes vehicles.

Specifications and technical data

• SKU: A1779056104
• Mark: Mercedes (Genuine OE)
• Condition: For parts or not working
• OEM Part Number: A1779056104
• Substitutable numbers: A1779056104, A 177 905 61 04
• Category: Switches & Controls

Purpose and function of the remote key fob

The remote key fob for the Mercedes W177 series belongs to the central locking and electronic ignition system. In practice, this means its design includes integrated control buttons and electronics that interface with the vehicle's security system. Even in a non-functional state as a complete unit, such a fob remains a valuable source of parts for repairing other units – especially regarding the housing, buttons, circuit boards, or mechanical elements.

Construction and potential service applications

Due to its factory origin, the remote key fob maintains the proper fit for locks, the electronic ignition, and the interior styling characteristic of the Mercedes brand. It can be used:

• as a donor for the housing when replacing a worn or cracked body of another fob,
• to source buttons and mechanical components,
• in diagnostic and training processes related to key fob electronics,
• as a base for professional refurbishment at a specialized service center.

For electronics workshops and service centers specializing in programming and repairing key fobs, such an item serves as practical material for testing and construction work.

Product condition and installation recommendations

The For parts or not working designation clearly indicates that the key is not intended for direct, ready-to-use operation as a fully functional fob. It should be treated as a source of components or a base for repair, taking into account the need for appropriate service work, programming, and adaptation to a specific vehicle. It is recommended that all installation and electronic tasks be performed by a specialized workshop equipped with the appropriate diagnostic tools and experience with Mercedes security systems.

Benefits of choosing an original Mercedes component

Choosing an original fob from the Switches, controls and ignition locks group ensures the preservation of factory geometry, fitment, and material quality. As a result, the housing and buttons sourced from such a key integrate better with existing interior equipment, and the electronic components – after potential repair – remain compliant with the manufacturer's requirements. This is particularly important when servicing premium class cars, where both functionality and visual consistency matter.

If you are planning a comprehensive repair or upgrade of the control and security zone in your Mercedes and need other elements from the same group, such as fobs, electronic ignition locks, or button modules, check the available parts in the Mercedes Switches, controls and ignition locks category.

Expert support and selection of used parts

When working with used control elements, it is worth knowing the specifics of original Mercedes components and the differences between various solutions used in the brand's models. To better plan your repair and consciously select components from dismantling, check out our guide: Used parts for Mercedes – original components from dismantling. You will find practical tips there on how to effectively use recycled components while maintaining a high standard of vehicle service.