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Common issue on 2004 Mercedes C230...wipers stop working because of worn wiring on Combo Switch on steering column. Aka turn-signal or multi-function switch.
Dealers charge $390 - $500 to replace this switch. You can get the part online for $118 and DIY in about 1 hour.
Requirements:
T10 Torx screwdriver
T30 Torx screwdriver
10mm Hex socket - steering wheel bolt
Breaker bar - steering wheel bolt
Torque Wrench - steering wheel bolt
Flat head screwdriver