Normal Operation

Voltage is sent from the PCM to the speed control switches through circuit VES10 (W). When a switch is pressed, the voltage is routed through a specific resistor value for each function. The PCM grounds the reference voltage through circuit RES08 (G/BR). The PCM uses this reference voltage to determine which speed control input function has been selected.

• DTC P0579 (Cruise Control Multifunction Input A Circuit Range/Performance) - sets when the speed control switch circuits are open, shorted to voltage or ground.
• DTC P0581 (Cruise Control Multi-Function Input A Circuit High) - sets when the speed control switch circuits are open or shorted to voltage.