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Tilt sensor, location/purpose/design/function - GF80.50-P-4105T

MODEL 211.0 with code (551a) Anti-theft alarm system (ATA) 

Fig 1: Locating ATA Tilt Sensor
G07265467Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
ATA tilt sensor, location The ATA tilt sensor (B33) is located at the right C-pillar in the area of the backrest  
Tilt sensor, purpose Monitoring position change of vehicle  
Tilt sensor, design The ATA tilt sensor (B33) contains electrodes in an electrolyte (electrically conductive fluid).  
ATA tilt sensor, function   GF80.50-P-4105-01T