DTC P0645: A/C Clutch Relay Circuit Open: Notes
WARNING: This page is about a different car, the 2002 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
For circuit reference, see WIRING DIAGRAMS in appropriate MANUAL or AUTOMATIC A/C-HEATER SYSTEMS article in AIR CONDITIONING & HEATING. For connector terminal identification, see CONNECTOR IDENTIFICATION
.