Sensor Operation

The microwave sensor is a movement detector. The microwave sensor detects movement and the direction of movement (changes in distance) in the entire vehicle interior. The range/sensitivity of the microwave sensors is pre-set (depending on vehicle model and equipment).

3 seconds after the last door or hatch is closed, the microwave sensor starts its reference run.

During the reference run, the vehicle interior is "scanned". This allows any changes in the vehicle interior (e.g. objects left on the rear seat) to be recognized. A self-test monitors the correct functioning of the microwave sensors. The microwave sensors are operational 20 seconds after the start of the reference run.

The 4 microwave sensors monitor the vehicle interior in zones. For this, the vehicle interior is divided into in 4 quadrants.

The microwaves disperse in the shape of a sphere.

The DWA control unit actuates the microwave sensors in the following order:

The microwave sensors work in a frequency range of approximately. 2.5 GHz. The microwave sensor uses the Doppler effect to create the alarm trigger signal.

The DWA control unit in the emergency power siren evaluates the signals from the microwave sensor and triggers the alarm.

The emergency power siren for the acoustic alarm is actuated. The signal for the visual alarm is fed to the light module through the K-CAN.