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Home >> Fiat >> 2016 >> 500 Turbo, Standard Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 14 (Electric Vehicle Control Unit (EVCU) Module - DTCS B12A4-11 To P1138-00 - 500 - Electric) >> DTC Troubleshooting >> P0571-00-Brake Switch 1 Performance >> Theory Of Operation

Theory Of Operation

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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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