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Rain/light sensor location/task/function - GF54.21-P-4123Q

MODEL 209.3 /4, 211.0 /2, 215, 220 as of 1.9.02 

Fig 1: Locating Rain/Light Sensor
G07288141Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Shown on model 209.3 

Rain/light sensor location The rain/light sensor (B38/2) is stuck onto the inside of the windshield below the overhead control panel control module.  
Rain/light sensor task The rain sensor (B38/2) measures the quantity of moisture on the windshield and controls the intermittent time of the wiper system. At the same time it also records the intensity of the daylight and through this controls the automatic functions of exterior lights and interior lights.  
Rain sensor/light sensor, function   GF54.21-P-4123-04Q