P0645

Tests 1 - 3:

Tests 4 - 8:

Test 9:

SYMPTOM
P0645-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
- A/C clutch relay circuit wiring harness intermittent problem
- A/C clutch relay circuit wiring harness observable defect
- A/C clutch relay control circuit short to ground
- Air conditioning clutch relay control circuit open
- Fused ignition switch output circuit open
- Fused ignition switch output circuit high resistance
- Powertrain control module