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Rain Sensor - Location/Task/Design/Function - GF82.30-P-4103GH

MODEL 163 with code 345a Rain sensor 

Fig 1: Identifying Rain Sensor Location
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  Rain Sensor - Location The rain sensor (B38) is adhered to the inside surface of the windshield.  
  Rain Sensor - Task The rain sensor (B38) assesses the rain intensity  on the windshield and automatically adjusts the intermittent wiper speed. In addition, light sensors gauge ambient light conditions  and this data is used to control the vehicle's light system.  
  Rain Sensor - Design The rain sensor (B38) comprises an IR transmitter and receiver unit, light sensors  and an electronic data analysis and interface circuit. The rain sensor (B38) is connected to the engine compartment CAN  .  
  Rain Sensor - Function   GF82.30-P-4103-02GH