Test C: DTC P0579 Or DTC P0581 - Speed Control Switch Circuit Failure

PINPOINT TEST C: DTC P0579 OR DTC P0581 - SPEED CONTROL SWITCH CIRCUIT FAILURE

C1-C2:

C3-C5:

C5-C6:

C7-C9:

C9-C10:

Normal Operation
The PCM sends a signal through circuit VES10 (WH) to the speed control switches, which passes through the clockspring. The return signal is sent to the PCM through circuit RES08 (GN/BN) and the clockspring.

DTC P0579 - may set when the speed control switch circuits are open, shorted to voltage or ground.

DTC P0581 - sets when the speed control switch circuits are shorted to voltage or open.

Possible Causes
- Circuitry
- Clockspring
- Speed control switch
- PCM