Interior Protection (UIS)

INTERIOR PROTECTION (UIS)

The UIS monitors the vehicle interior for motion through ultrasonic sound waves. The UIS is a combined transmitter and receiver.







The X5 UIS sensor is incorporated into the rear seat interior light trim cover. It is a two piece unit with cable connection to the rear transmitter/receiver.

The UIS and trim panel are clearly identified with arrows indicating forward mounting direction.

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 (trim cover ensures directional installation).

Every time the DWA system is armed (signal STDWA), the sensor adapts to what ever objects might be stationary in the interior.







The sensor emits ultra sonic waves in a programmed timed cycle. It receives echos of the emitted waves.

The UIS amplifies the received sound wave signals and compares them with the transmitted waves. The UIS also checks the incoming echos for background hiss (wind noise through a partially open window) and adapts for this.

- If the echos are consistently similar, no movement is detected,
- If the echos are altered, (inconsistent), the UIS determines motion in the interior compartment.

If motion is detected, the UIS changes to a constant cycle and the echo is compared again. If the inconsistency is still present the UIS sends the activate siren signal (INRS) to the GM.

As with the tilt sensor, the UIS is also switched OFF when the vehicle is locked two times within ten seconds. This allows the sensor to be switched OFF for transportation purposes.