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Pinpoint Test B : P0645: Notes

Diagnostic Overview 

Refer to Automatic Climate Control System for schematic and connector information.

Normal Operation and Fault Conditions 

Voltage is provided to the A/C clutch relay coil. When A/C is requested and A/C line pressures allow, a ground is provided to the A/C clutch relay coil from the PCM, energizing the A/C clutch relay.

DTC Fault Trigger Conditions 

DTC Description Fault Trigger Conditions
P0645 A/C Clutch Relay Control Circuit: No Sub Type Information The DTC sets when the PCM grounds the relay circuit and more current than expected is detected on the relay circuit. The DTC also sets when the relay circuit is off and no voltage is detected on the relay circuit.

Possible Sources 

Visual Inspection and Diagnostic Pre-checks 

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