Ultrasonic Sensor: Description and Operation

Interior Protection Sensor with Integrated DWA Control Unit




The interior protection sensor is an ultrasound-based (USIS) motion detector which detects all movements inside the vehicle interior and evaluates them using the DWA logic.

The DWA generates an alarm if the interior sensor detects a movement which meets the triggering criteria, or if alarm triggers are indicated via the K-CAN SYSTEM or DWA K bus.

The DWA control unit is supplied voltage by the Power Module (KL 30).

An electronic fuse for the DWA is inside the Power Module.

For reasons of safety, KL 30 is not disconnected for the DWA by the Power Module when consumer cutoffs are performed.

If the DWA detects a drop in the battery voltage below a certain value, then line monitoring of the DWA K bus is deactivated in order to avoid a false alarm. This limit value is set to 8.5 V .

Arming of the DWA is not possible at KL R or KL 15.