P1683 Speed Control Power Relay Circuit

SYMPTOM
P-1683 SPEED CONTROL POWER RELAY CIRCUIT

WHEN MONITORED
With the ignition key on, speed control switched on.

SET CONDITION
The speed control power supply circuit is either open or shorted to ground.

POSSIBLE CAUSES
- S/C brake switch output circuit shorted to ground
- S/C servo connector ground circuit open
- Speed control on/off output circuit open
- Speed control power supply circuit open
- Speed control servo defective
- Brake switch adjustment
- Brake switch defective
- S/C vacuum solenoid control circuit open
- S/C vacuum solenoid control circuit shorted to ground
- S/C vent solenoid control circuit open
- S/C vent solenoid control circuit shorted to ground
- Powertrain control module def (speed control)