P1683 Speed Control Power Relay CKT or 12V Driver Circuit

SYMPTOM
P-1683 SPEED CONTROL POWER RELAY CIRCUIT

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)