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Sun sensor position/task/function - GF83.57-P-2111GI

MODEL 163 as of 1.9.01 with CODE (580a) Automatic air conditioning 

Fig 1: Identifying Sun Sensor
G04608991Courtesy of MERCEDES-BENZ USA
  Sun sensor, location The sun sensor (B32) is located behind the instrument cluster in the instrument panel.  
  Sun sensor, task The sun sensor (B32) measures the intensity and direction of the solar radiation.  
  Sun sensor, function The sun sensor (B32) records the intensity and angle of incidence of the solar radiation onto the vehicle. This makes it possible, dependent on the solar radiation intensity (brightness) the in-car temperature and the blower speed to be automatically adjusted.