Audi A4 B8 A5 8T Roof Alarm Movement Detector 8K0951177

Audi A4 B8 A5 8T Roof Alarm Movement Detector is an original interior security system component responsible for precise motion detection in the front part of the cabin. Mounted in the headliner, it works with the factory alarm, increasing the vehicle's protection level and improving the functionality of the anti-theft system. Thanks to its design compliant with manufacturer standards, it serves as a consistent addition to the factory Audi security system.

Specifications and technical data

• SKU: 8K0951177-1
• Mark: Audi
• Condition: Used
• OEM Part Number: 8K0951177
• Substitutable numbers: 8K0951177, 8K0 951 177, 28138344
• Location on the vehicle: Front
• Category: Interior Light Assemblies

Function and role of the cabin motion sensor

The presented headliner motion sensor is a component responsible for monitoring the space inside the vehicle in the front area. Once the alarm is armed, it monitors the cabin, reacting to unwanted movement and sending a signal to the alarm control unit. This allows the system to react faster to any attempt to interfere with the vehicle, which translates into a higher level of interior protection.

Its placement in the headliner facilitates uniform "vision" of the cabin space, and integration with the Audi electrical system ensures stable operation and predictable behavior in typical usage scenarios.

Construction and integration with the vehicle's electrical system

The sensor is designed as a component for installation in the front part of the headliner, taking into account the interior geometry of Audi A4 B8 and A5 8T models. The design provides for cooperation with factory wiring and control modules, which facilitates installation and limits the need for system modifications.

As a component from the Interior lighting group, this element is integrated with the headliner, ensuring it does not disturb the interior aesthetics and remains discreet for the user while maintaining full functionality within the alarm system.

Purpose and application in Audi

The roof alarm movement detector has been developed for Audi vehicles, in particular for the A4 B8 and A5 8T models, where it works with the factory security system. Using an original solution allows for maintaining the consistency of all components responsible for interior security.

This element is particularly useful for:

• restoring full functionality of the alarm system after damage or removal of the previous sensor,
• comprehensive repair of the headliner installation,
• replacing missing components after upholstery work or interior modernization.

Condition, selection, and installation aspects

The product comes from disassembly and is offered as a used original Audi component, which allows for maintaining compliance with factory installation standards and the logic of the alarm system operation. Before selection, it is recommended to verify compatibility with the specific vehicle equipment version to ensure proper cooperation with the existing installation.

Due to its location in the front part of the headliner, installation requires access to the ceiling trim and careful handling of the wiring harness so as not to damage other elements of the lighting system and cabin equipment.

If you are planning a comprehensive repair or modernization of the interior lighting and security zone in your Audi and need other elements from the same group, such as control modules, ceiling lights, or additional sensors, check the available parts in the Audi interior lighting category.

Safety, comfort, and technical knowledge

A functional cabin motion sensor has a direct impact on the effectiveness of the alarm and the peace of mind of the user, who can rely on the factory security system. A properly selected component reduces the risk of false alarms and ensures a predictable vehicle response to real threats.

To better understand the importance of properly functioning components responsible for visibility and safety, it is worth reading the guide on lighting systems and their selection: See more and better – a complete guide to selecting and replacing used LED and Xenon headlights.