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Rain sensor, location/task/design/function - GF82.30-P-4103GA

MODEL 463.306 /336 /346 as of model year 2011 /YoM 10 

MODEL 463.202 /222 /236 /237 as of model year 2009 /YoM 08 

MODEL 463.244 /245 /247 /248 /249 /250 /254 /309 /332 /333 up to 31.8.08 

MODEL 463.270 /271 /303 /340 /341 as of model year 2007 

Fig 1: Locating Rain Sensor
G07705750Courtesy of MERCEDES-BENZ USA
  Rain sensor, location The rain sensor is glued onto the inside of the windshield in the area of the inside rearview mirror unit.  
  Rain sensor, purpose The rain sensor (B38) measures the quantity of moisture on the windshield and controls the intermittent time of the wiper system.  
  Rain sensor, design The rain sensor (B38) consists of an infrared transmitter and receiver unit and an electronic circuit which serves for evaluation and as interface.  
  Rain sensor, function   GF82.30-P-4103-02GA