Interior motion sensor transmitter and receiver, function - GF80.50-P-4104-02D

Model 202 sedan, 210.0 as of 6/98, 210.2 as of 6/99, 215, 220, sedan with ultrasonic interior protection 

Function principle 

The interior motion sensor transmitter and receiver (A26/14) monitors the vehicle passenger compartment with the aid of ultrasonic signals.

Activation/deactivation 

The unit is activated or deactivated with corresponding commands from the data interface.

Ultrasonic interior protection 

When switched on the transmitter emits ultrasonic pulses. These pulses are reflected by the walls and objects in the vehicle.

The reflections are recognized by the receiver in the unit and evaluated by the micro-controller. The reflection image changes when objects are moved in the passenger compartment. In this manner the unit recognizes any motion in the vehicle and is able to trigger an alarm.

Checking glass breakage sensors (only T-model, models 202/210) 

Glass breakage sensors  are connected to an additional input on the transmitter/receiver unit. A discontinuity in the conductor loops in the glass breakage sensors is recognized as glass breakage by the logic circuitry and transmitted to the PSE (A37) via the data bus.