Normal Operation
The speed control actuator sends and receives signals to the speed control switches through circuits VES10 (WH) and RES08 (GN/BN). Voltage to the speed control actuator is supplied through circuit CBP20 (YE/VT) from the smart junction box (SJB). Ground for the speed control actuator is through circuit GD123 (BK/GY).
When the brake pedal is applied, the stoplamp switch routes voltage through circuit CCB15 (BN/GN), sending a voltage signal to the speed control actuator. When the speed control actuator receives this input, the speed control actuator goes into a stand-by mode.
The clutch pedal position (CPP) switch, if equipped, is normally closed. When the clutch is applied, ground is removed from circuit CCB15 (BN/GN) to the speed control actuator, and the actuator goes into a stand-by mode.
The speed control deactivator switch (closed when the brake pedal is not applied) routes voltage through circuit CES09 (VT/OG) to the speed control actuator. When the brake pedal is firmly pressed, the speed control deactivator switch opens and voltage is no longer supplied to the speed control actuator.
The speed control actuator receives the speed signal from the powertrain control module (PCM) through circuit VMC05 (VT/OG).
Possible Causes
- Fuse(s)
- Circuit CBP20 (YE/VT) open
- Circuit CCB15 (BN/GN) open
- Circuit CES09 (VT/OG) open
- Circuit GD123 (BK/GY) open
- Circuit RES08 (GN/BN) open or short to voltage
- Circuit VES10 (WH) open, short to ground or voltage
- Circuit VMC05 (VT/OG) open, short to ground or voltage
- Stoplamp switch
- CPP switch (manual transmission)
- Speed control deactivator switch
- Speed control cable
- Throttle body linkage
- Clockspring
- Speed control switch
- Speed control actuator
- SJB
- PCM