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Symptom: P0645-A/C CLUTCH RELAY CIRCUIT When Monitored and Set Condition: 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 A/C CLUTCH RLY CIRCUIT WIRING HARNESS OBSERVABLE PROBLEM A/C CLUTCH RLY CIRCUIT WIRING HARNESS INTERMITTENT PROBLEM FUSED IGNITION SWITCH OUTPUT CIRCUIT OPEN A/C CLUTCH RELAY CONTROL CIRCUIT OPEN A/C CLUTCH RELAY CONTROL CIRCUIT SHORT TO GROUND A/C CLUTCH RELAY PCM (A/C CLUTCH RELAY) TEST ACTION APPLICABILITY 1 Ignition on, engine not running t, actuate the A/C Clutch Relay. Is the A/C Clutch Relay clicking? All Yes → No → 2 Turn the ignition off. All Yes → Repair as necessary. No → 3 Ignition on, engine not running. t, actuate the A/C Clutch Relay. Wiggle the Wiring Harness from the Relay to the PCM. All Yes → Repair as necessary where wiggling caused the clicking to be No → Test Complete. 257 HEATING & A/C |