Mercedes-Benz W204 W212 W221 Radio Remote Control Keyless Key Button A2049055902

Mercedes-Benz W204 W212 W221 Radio Remote Control Keyless Key Button is an original part from the Switches, control elements and ignition switches category, designed for the remote control and keyless entry system in selected Mercedes models. The product is offered in for parts or not working condition, making it suitable primarily as a donor for components, housings, or buttons for specialized key repairs and refurbishment.

Specifications and technical data

• SKU: A2049055902
• Mark: Mercedes (Genuine OE)
• Condition: For parts or not working
• OEM Part Number: A2049055902
• Substitutable numbers: A2049055902, A 204 905 59 02, KZ
• Category: Switches & Controls

Application and function in the vehicle

The presented keyless remote button is responsible for operating the radio remote control functions in Mercedes C-Class (W204), E-Class (W212), and S-Class (W221) vehicles equipped with the appropriate comfort access system. The component is part of the central locking and ignition control system, interacting with the vehicle's electronics via an encoded radio signal.

Due to its design, it can be used as a base for:

• transferring functional parts of the housing or buttons to another key,
• obtaining mechanical components for repairing worn-out remotes,
• training and diagnostic purposes in workshops specializing in Mercedes electronics.

Construction and technical characteristics

The Mercedes-Benz W204 W212 W221 Radio Remote Control Keyless Key Button is part of the comfort control system, where the key acts as a radio transmitter interacting with body control modules. As an item from the Switches, control elements and ignition switches category, it is responsible for the physical operation of opening, closing, and – depending on the vehicle configuration – additional comfort functions.

This type of solution is designed by the manufacturer with precise fitment for a specific vehicle generation in mind, both in terms of shape and electronic interface. This allows for maintaining consistency with the factory security and comfort system, provided the element is used as intended and after proper verification by a specialist.

Technical condition and potential service applications

The offered item is classified as for parts or not working, which means it is not intended for direct, functional use as a complete, working remote. However, it can serve as a valuable source of parts for workshops dealing with key refurbishment, automotive electronics repair, or the reconstruction of damaged housings.

Before using it in a specific vehicle, detailed diagnostics and compatibility verification by an experienced service center are recommended due to its connection with the immobilizer system and vehicle security. This approach helps reduce repair costs while maintaining compliance with the manufacturer's factory solutions.

Integration with other Mercedes control elements

In Mercedes vehicles, the remote control system works in conjunction with comfort modules, the electronic ignition switch, and security systems. Proper matching of components from the switches and controllers group is important for the stability of the entire system. In the case of extensive repairs or upgrades to the keyless entry system, it is worth considering the full context of the installation, not just a single remote component.

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 remote buttons, ignition switch inserts, or control modules, check the available parts in the Mercedes switches, control elements and ignition switches category.

Expert support and selection of used parts

When working with used comfort system and body electronics components, it is particularly important to select the correct parts and understand the differences between individual equipment versions. In the context of the Mercedes brand, it is worth familiarizing yourself with practical tips regarding the selection of dismantled components, their verification, and the cost-effectiveness of repairs compared to purchasing new parts.

More information on the safe and informed use of dismantled components can be found in the article Used parts for Mercedes – original components from dismantling, which discusses, among other things, the specifics of comfort and electronic elements in vehicles of this brand.