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Home >> Fiat >> 2014 >> 500c Abarth >> Repair and Diagnosis >> External Pages >> Different car >> Section 37 (Electric Vehicle Control Unit (EVCU) Module - DTCS B12A4-11 To P1138-00 - 500E) >> Diagnosis And Testing >> P0571-00-Brake Switch 1 Performance >> Theory Of Operation

Theory Of Operation

WARNING: This page is about a different car, the 2014 Fiat 500e. However, it is still accessible from the selected car via links, so may be relevant.

The Electric Vehicle Control Unit (EVCU) monitors the status of both brake switches. Brake Switch 1 is normally closed and Brake Switch 2 is normally open. When the brake pedal is pressed the status of both switches change from Closed to Open or Open to Closed. If one switch status changes and the other does not a diagnostic code will set.

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