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Stop lamp switch, location/task/function - GF42.10-P-4000A

WARNING: This page does not describe the selected car, but rather 42 other vehicles, including the 1999 Mercedes-Benz S600, 1999 Mercedes-Benz S500, 1999 Mercedes-Benz S420, 1999 Mercedes-Benz S320, and 1999 Mercedes-Benz CL600. However, it is still accessible from the selected car via links, so may be relevant.

MODELS 129, 140, 163, 168, 170, 202, 203, 208, 209, 210, 211, 215, 220, 230, 240, 460, 461, 463 

Fig 1: Identifying Stop Lamp Switch
G04607216Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
  Stop lamp switch, location   GF42.10-P-4000-01A
  Stop lamp switch, task The stop lamp switch (S9/1) passes a signal to the stop lamps indicating that the driver has pressed the brake pedal and also passes a signal to inform different electronic systems (e.g. BAS, ETS, ASR, ESP, CC, IFI, DFI, CDI, ME-SFI) of the brake actuation.  
  Stop lamp switch, function The stop lamp switch (S9/1) functions in two ways:
It functions as a NO contact (2) for the stop lamp and as a NC contact (1) for control modules.