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
- Air conditioning clutch relay defective
- Fused ignition switch output circuit open
- A/C clutch relay ckt wiring harness intermittent defect
- A/C clutch relay ckt wiring harness observable defect
- A/C clutch relay control circuit open
- A/C clutch relay control circuit short to ground
- Powertrain control module defective