Mercedes C118 W177 Security Alarm Bonnet Limit Switch A1779059900

Mercedes C118 W177 Security Alarm Bonnet Limit Switch is a precision component of the hood security system, responsible for reliably monitoring the hood's closed status. This component from the Hood hinges, locks and other parts category works with the vehicle's electrical system, transmitting signals to comfort and safety systems. Thanks to its original design intended for Mercedes C118 and W177 series models, it ensures stable operation of the vehicle's factory systems.

Specifications and technical data

• SKU: A1779059900
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1779059900
• Substitutable numbers: A1779059900, A 177 905 99 00
• Category: Hinges, Latches & Additional Bonnet Components

Function and role of the hood sensor

The hood limit switch in Mercedes C118 and W177 models plays a key role in the bodywork area – it informs the vehicle's control units about the current position of the hood. A properly functioning sensor:

• ensures the correct operation of the open hood warning on the instrument cluster,
• supports safety systems that require confirmation that the hood is closed,
• stabilizes the operation of comfort systems that react to the bodywork status.

Thanks to its precise geometry and correct operating travel, the switch works with the hood lock without the need for any additional modifications.

Construction and fitment for Mercedes C118 / W177

The offered hood sensor has been designed specifically for use in the front body structure of Mercedes C118 and W177 models. This means:

• compatible mounting within the lock or its immediate surroundings,
• an electrical connector adapted to the wiring harness in these models,
• properly selected contact operating characteristics for Mercedes electronic systems.

Such fitment allows for installation in place of the factory component, maintaining the original functionality and logic of the vehicle's systems.

Benefits of using an original limit switch

Using a dedicated hood sensor in a Mercedes provides tangible operational benefits:

• Stable cooperation with vehicle electronics – electrical parameters are consistent with the requirements of Mercedes control units.
• Reduction of the risk of errors and warning messages related to incorrect signals from the hood area.
• No need for installation adaptation – the component works in the existing system without additional modifications.

For users who want to maintain the consistency of safety and comfort systems, choosing such a component is a technically sound solution.

Product characteristics and economic aspect

The offered limit switch comes from the used parts group, which allows combining the functionality of an original component with a more favorable purchase cost. For many Mercedes users, this is a reasonable compromise between quality and service budget, especially when repairing bodywork elements and hood accessories.

If you want to better plan your service expenses and understand in which situations used OEM parts are a cost-effective choice, it is worth checking out our guide: Rising repair costs and the boom in used parts – how to save on car maintenance?.

Comprehensive service for the Mercedes hood area

If you are planning a comprehensive repair or upgrade of the hood area in your Mercedes and need other elements from the same group, such as locks, latches, or additional mounts, check out the available parts in the Mercedes hood hinges, locks and other parts category.