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Symptom: P0645-A/C CLUTCH RELAY CKT When Monitored and Set Condition: P0645-A/C CLUTCH RELAY CKT When Monitored: With the ignition on. Battery voltage greater than 10.4 volts. A/C Switch on. Set Condition: An open or shorted condition is detected in the A/C clutch relay control circuit. POSSIBLE CAUSES A/C CLUTCH RELAY OPERATION FUSED IGNITION SWITCH OUTPUT CIRCUIT OPEN INTELLIGENT POWER MODULE A/C CLUTCH RELAY IPM FUSE & RELAY CENTER (C13) A/C CLUTCH RELAY CONTROL CKT OPEN (C13) A/C CLUTCH RELAY CONTROL CIRCUIT SHORT TO GROUND PCM TEST ACTION APPLICABILITY 1 Turn the ignition on. t, actuate the A/C Clutch Relay. Is the A/C Clutch Relay operating? All Yes → Refer to the INTERMITTENT CONDITION symptom in the Driveability category. No → Go To 2 2 Turn the ignition off. All Yes → Go To 3 No → Go To 8 139 DRIVEABILITY - SBEC |