P1683 Speed Control Power Relay CKT or 12V Driver Circuit

SYMPTOM
P-1683 SPEED CONTROL POWER RELAY OR CIRCUIT SPEED CONTROL 12V DRIVER 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
- Ground circuit open
- S/C brake switch output circuit shorted to ground
- Speed control brake switch output circuit open
- Speed control power supply circuit open
- Speed control servo defective
- Brake switch defective
- Brake switch out of adjustment
- 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)