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Interior motion sensor transmitter/receiver, location/task/design/function - GF80.50-P-4104QA

MODEL 209.4 with CODE (551a) Anti-theft alarm system (ATA) with CODE (882b) Interior motion sensor (only with anti-theft alarm system) except CODE (810) Sound system 

Fig 1: Identifying Interior Motion Sensor Transmitter/Receiver Location - Model 209.4
G04960179Courtesy of MERCEDES-BENZ USA
  interior motion sensor transmitter/receiver, location The interior motion sensor transmitter/receiver (A26/14) is located in the front center stowage compartment.
Die interior motion sensor transmitter/receiver (Slave) (A26/15) is located in the rear stowage shell
 
  Interior motion sensor transmitter/receiver, purpose The interior motion sensor transmitter/receiver (A26/14) and the interior motion sensor transmitter/receiver (slave) (A26/15) operate as motion detector and sense motions in the passenger compartment.  
  Interior motion sensor transmitter/receiver, body The interior motion sensor transmitter/receiver (A26/14) and the interior motion sensor transmitter/receiver (slave) (A26/15) include an ultrasonic sensor and receiver as well as a microcontroller with data interface.  
  Interior motion sensor transmitter/receiver, function   GF80.50-P-4104-02Q