Start Stop Switch Mercedes W177 W247 W907 Engine Button Unit A1779051001

Start Stop Switch Mercedes W177 W247 W907 Engine Button Unit is an original engine start control component, belonging to the Switches, control elements and ignition locks category. Designed by the vehicle manufacturer, it ensures seamless operation with factory electronics and convenient control of the engine start and stop functions. This used component allows for a technical, yet cost-effective replacement of a damaged button in the latest generation of Mercedes vehicles.

Specifications and technical data

• SKU: A1779051001-2
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1779051001
• Substitutable numbers: A1779051001, A 177 905 10 01
• Category: Switches & Controls

Function and application of the Start Stop Switch

The presented button is a central control component for the keyless start system in newer Mercedes compact and commercial models. It is responsible for:

• transmitting control signals to the electronic modules responsible for engine ignition,
• handling the engine shutdown procedure,
• ergonomic control of the start/stop function from the console or dashboard.

Thanks to its factory design, the button works with the original wiring harness and vehicle safety systems, which promotes stable operation of the starting system.

Construction and integration with the control system

As a part of the Switches, control elements and ignition locks group, the start/stop button is integrated with the vehicle's electronics in the manner intended by the manufacturer. This means:

• a dedicated electrical connector design tailored for Mercedes installations,
• a spring mechanism providing a tactile, repeatable click when pressed,
• a housing adapted for mounting in the factory slot in the console or control panel.

Such a solution facilitates installation and reduces the risk of improper seating of the component, which is essential for the correct operation of the starting system.

Benefits of using an original used component

Choosing an original, used start/stop button for a Mercedes allows you to combine the preservation of factory performance parameters with reasonable repair costs. Key advantages include:

• factory fitment to the electrical installation and interior architecture of the vehicle,
• maintaining consistency with comfort and safety systems,
• reducing the risk of communication errors in the vehicle network compared to low-quality replacements.

A used component is a good solution when replacing a damaged button if you want to maintain the original functionality and aesthetics of the control panel.

Selection, installation, and vehicle compatibility

To correctly select this button for a specific Mercedes, it is worth verifying compatibility with the vehicle's equipment and the installed starting system. Data such as part identifiers or manufacturer markings are helpful, as they allow for precise matching of the component to the given model and year.

The installation itself usually comes down to removing the panel, unplugging the old button, and connecting the new component into the same slot. Thanks to the design provided by the vehicle manufacturer, the entire operation is similar to plug-and-play, which reduces the time required for service and minimizes the risk of damaging the installation.

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

Vehicle system safety and expert knowledge

Replacing control elements in modern cars requires considering the impact on safety systems and electronic communication. When working on critical systems, such as brakes, it is worth additionally consulting specialized materials. An extended list of recommendations regarding the safe selection of used components can be found in the article Second-hand braking system: how to safely choose discs, calipers, and ABS?, which organizes the key principles of assessing the condition of parts and their correct installation.

For a broader perspective on the use of original, used components in premium cars, including Mercedes vehicles, the material Crisis in the new parts market? Why used originals for premium cars (BMW, Mercedes, Porsche) are the hottest trend in 2026 may also be helpful, discussing current directions in the spare parts market and a practical approach to repairs using second-hand OEM components.