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Wiper system automatic speed reduction, function - GF82.30-P-4006SX

MODEL 221.0/1, 216.3 except CODE (494) USA version up to Model Year 8 

Fig 1: Wiper System Automatic Speed Reduction Function Diagram
G10112178Courtesy of MERCEDES-BENZ USA

Function requirements 

Function 

If the vehicle speed undershoots 5 km/h, then the front SAM control unit switches the wiper motors down one level. During rain sensor mode, the speed remains dependent on the degree of wetting at the rain/light sensor.

Function abort 

The speed reduction is canceled by turning the combination switch to another position or by operating the touch wiping or washing functions.

If the value of 8 km/h is exceeded again as the vehicle speed increases, then the front SAM control unit automatically switches the wiper motors back to the wiper level set at the combination switch.

  Instrument cluster, component description A1
Model 221.0/1
GF54.30-P-6000SX
  Wiper motor - Component description M6/6 and M6/7 GF82.30-P-5010SX 
  Driver-side SAM control unit with fuse and relay module, component description N10/1 GF54.21-P-6010SX
  Electronic ignition/starter switch control unit (EIS) component description N73 GF80.57-P-6000SX
  Steering column module component description N80 GF54.21-P-6050SX
  Central gateway control unit, component description N93 GF54.21-P-4170SX
  Combination switch, component description S4 GF82.30-P-5000SX