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Home >> Chrysler >> 2007 >> Pacifica Base, 4.0 X >> Repair and Diagnosis >> Engine Performance >> System >> DTCS P0645 To P1653 >> P0645-A/C Control Circuit-Open >> Possible Causes
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Possible Causes

Possible Causes 
INTERMITTENT DTC
INTERNAL FUSED B(+) CIRCUIT OPEN OR HIGH RESISTANCE
INTERNAL FUSED IGNITION SWITCH OUTPUT (RUN-START) CIRCUIT OPEN OR HIGH RESISTANCE
(C13) A/C CLUTCH RELAY CONTROL CIRCUIT SHORTED TO VOLTAGE
(C13) A/C CLUTCH RELAY CONTROL CIRCUIT SHORTED TO GROUND
(C13) A/C CLUTCH RELAY CONTROL CIRCUIT OPEN OR HIGH RESISTANCE
A/C CLUTCH RELAY
POWERTRAIN CONTROL MODULE (PCM)

Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .