No twelve volts anywhere for A/C

Have you checked refrigerant level? Have the system drained to measure how much Freon is in it and then charge it with the proper amount. If it is ok check the A/C clutch relay circuit for an open circuit. Also if you have a compatible scan tool see if you can see the actual command being sent to activate the compressor?

Also check the high pressure cut off since the circuit runs through there before going through the cycle switch. Let us know what you find.

Added some diagrams too.