Have you confirmed fuse F2.23, F2.2, and F1.24? (F1=BJB, F2=CJB)
Have you tested the AC clutch itself? Send +12 volts directly to the clutch to verify function. BK/YE wire at the CCRM.
Verify +12 volts at the AC pressure switch DG/OG wire (post).
Verify continutity at the high pressure switch terminals 1/4 and 2/3 (post).
Monitor the PCM with an ODB2 scanner. Confirm that the PCM is calling for AC.
If all of the above is good, may be the function selector switch in the dash. Depending upon other tests results, the problem can be narrowed down.