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Interior protection sensor, location/purpose/function - GF80.50-P-4113TA

MODEL 211.0 with code (551a) Anti-theft alarm system (ATA) with code (882b) Interior motion sensor (only with anti-theft alarm system) except CODE (413) Panorama sliding roof 

MODEL 211.2 with code (551a) Anti-theft alarm system (ATA) with code (882b) Interior motion sensor (only with anti-theft alarm system) 

Shown on model 211.2 

Fig 1: Locating Rear Interior Lamp And Interior Protection Sensor
G07265470Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Interior protection sensor, location The interior protection sensor (E15/3b2) is located in the rear interior lamp (E15/3)
Interior protection sensor, purpose The interior protection sensor (E15/3b2) operates a motion sensor and senses motions in the passenger compartment
Interior protection sensor, function Monitoring interior compartment with aid of ultrasonic signals not specially focussed. In this manner the interior protection sensor (E15/3b2) recognizes entry into the vehicle and can actuate an alarm.