A/C Clutch Relay -- PCM Output

Fig. 25 Power Distribution Center (PDC):

The PCM controls the air conditioning clutch relay ground circuit. Buss bars in the Power Distribution Center (PDC) supply voltage to the solenoid side and power side of the relay.

When the PCM senses low idle speeds or wide open throttle through the throttle position sensor, it removes the ground for the A/C compressor clutch relay. When the relay de-energizes, the contacts open preventing air conditioning clutch engagement.

The air conditioning clutch relay is located in the PDC Fig. 25. The inside top of the PDC cover has a label showing relay and fuse location.