Interior Sensor FIS (Up To 99 MY)
The interior sensor is mounted in the center of the headliner panel. Due to the design of the vehicles interior, the sensor is uni-directional and must be installed in the proper direction to ensure proper operation of the system.
When the alarm system is armed, the sensor emits electromagnetic waves at a frequency of 2.45 GHz. As long as nothing is moving in the vehicle, the waves as bounced back to the sensor at the same frequency. The sensor monitors these bounced back waves as an indication that nothing is disturbed within the vehicle.
If a foreign object enters the vehicle, the frequency of the bounced back signal changes. The sensor monitors the changed frequency and triggers the alarm.
Every time the DWA system is armed, the sensor adapts to what ever objects might be stationary in the interior. This allows packages or objects to be left inside the car without effecting the operation of the system. The sensitivity of the sensor is set so that the moving object must be at least as large as a bumblebee. This prevents a false alarm from occurring from small insects that might be caught in the vehicle.
The FIS is switched OFF when the vehicle is locked two times within ten seconds. The LED will flash one time for confirmation. This allows the sensor to be switched OFF to avoid false alarms when the windows are left open for venting.