P0645 A/C Clutch Relay Circuit

SYMPTOM
P-0645 A/C CLUTCH RELAY CIRCUIT

WHEN MONITORED
With the ignition key in the run position and battery voltage above 10.4 volts.

SET CONDITION
An open or shorted condition is detected in the A/C clutch relay control circuit.

POSSIBLE CAUSES
- Fused ignition switch output circuit open
- A/C clutch relay def
- A/C clutch relay control circuit open
- A/C clutch relay control circuit short to ground
- A/C clutch rly ckt wiring harn intermittent def
- A/C clutch rly ckt wiring harn observable def
- PCM def (A/C clutch relay)