Mercedes W177 Remote Key Radio Alarm Fob Button A1779055504

Mercedes W177 Remote Key Radio Alarm Fob Button is an original component from the Switches, controls and ignition locks group, designed for remote vehicle control in Mercedes vehicles. It serves as an ideal base for repairs, refurbishment, or sourcing specific electronic and mechanical components from an existing remote key.

Specifications and technical data

• SKU: A1779055504
• Mark: Mercedes (Genuine OE)
• Condition: For parts or not working
• OEM Part Number: A1779055504
• Substitutable numbers: A1779055504, A 177 905 55 04
• Category: Switches & Controls

Purpose and function of the remote key

The remote key for the W177 model is responsible for remote central locking control and, depending on the vehicle configuration, may work with the ignition system or keyless entry module. As an item from the Switches, controls and ignition locks category, it is part of the system responsible for driver authorization and vehicle starting.

The product is marked as For parts or not working, which means it is best suited for:

• sourcing functional electronic components or the housing,
• comparative analysis when matching another remote key,
• service projects where an original carrier is needed to transfer components.

Benefits of using an original Mercedes remote key

In the case of control and ignition systems, using an original Mercedes remote key ensures compatibility with the vehicle's factory electrical architecture. This facilitates the work of automotive electricians or services specializing in key programming, as the housing, circuit board, and connectors are matched to the manufacturer's standards.

For workshops and automotive electronics specialists, such an item can be a valuable source of spare parts, especially when maintaining the factory look and ergonomics of vehicle operation is a priority.

Service and diagnostic application

Due to its condition marked as For parts or not working, the W177 remote key is recommended primarily for service applications. It can be used as:

• a carrier for transferring functional components from another unit,
• a reference for matching the appropriate housing or buttons,
• training material for learning Mercedes remote key programming and diagnostics.

This approach allows for optimizing repair costs while maintaining a high level of compliance with the manufacturer's factory solutions.

Integration with the vehicle control system

The remote key works with electronic systems responsible for the immobilizer, central locking, and – depending on the configuration – comfort functions. As an element of the control and ignition group, it is part of a broader vehicle security ecosystem, which is why it is often used in workshop practice as a source of original components for repairing existing keys.

If you are planning a comprehensive repair or upgrade of the control and ignition area in your Mercedes and need other elements from the same group, such as buttons, control modules, or ignition inserts, check out the available parts in the Mercedes switches, controls and ignition locks category.

Safety and selection of used components

When working with systems responsible for vehicle safety and control, it is worth using an organized procedure for selecting used parts. For components such as calipers, discs, or ABS modules, the approach described in our blog article may be helpful – you will find a practical checklist there on how to assess the condition and suitability of components from the secondary market. To better plan your service and purchases, read the material: Second-hand braking system: how to safely choose discs, calipers, and ABS?.

Summary

Mercedes W177 Remote Key Radio Alarm Fob Button is an original component intended primarily for parts sourcing and service applications within the vehicle's control and ignition system. For workshops, electronics technicians, and key programming specialists, it can provide a practical base for repairs, reconstruction, or training, while maintaining the factory geometry and standards of the Mercedes manufacturer.