A/C Switch & Compressor Clutch Relay
WARNING: This page is about a different car, the 1997 Mitsubishi Montero. However, it is still accessible from the selected car via links, so may be relevant.
Using DVOM, check A/C power supply voltage from PCM. Turn ignition to OFF position. Disconnect PCM connector. Turn A/C switch and ignition switch to ON positions. Check voltage between PCM A/C power supply terminal and chassis ground. If battery voltage is not as present, check and repair circuit(s).