First and foremost pull the codes...
Double check, with a TEST LIGHT, the following fuses: Fuse #10 (7.5 amp) in the IP fuse box. Mini Fuse #1 (10 amp) and #8 (30 amp) in Power Distribution Box (PDB) under hood.
For the layout of the PDB click this link Owners Manual
and go to roadside emergencies.
If the fuses are good and with the engine running, set the selector to AC, pull the AC low pressure (cycling) switch and jump the black with yellow stripe wire to chassis ground. If the AC now works, connect your test light to the battery positive terminal and probe the red with yellow wire. Test light should light up. If not, check the AC high pressure switch and associated ground.
If the AC did not come on after jumping the low pressure switch and the high pressure switch and ground circuit are good, pull the AC control relay and verify your getting power from the PCM Power Relay to socket terminal 2. If you have power, connect your test light to the battery positive terminal and probe socket terminal 1 (test light should light up).
If test light lights up, you'll need to pull the dash center panel so you can get to the AC control panel wiring. Once you have the control panel out, look for a purple wire from the selector control switch. Probe this wire and verify you have power at this wire.
If all the above checks good you'll need to check the wiring at the PCM side.
Note, pressure reading without the AC compressor running wont tell you much. However, 100 psi is in the ball park.
If you want a copy of the wiring schematics, PM me a email address and I'll send you a copy.