Check your compressor clutch circuit. Possibly a bad clutch relay, or the field coil has gone bad. May be slightly different terminology as I work on Honda's... but same basic concept.
You should be able to test the clutch be seeing if it will turn when the system is turned off and not when the system is turned on. Just turn the ignition on but don't start the engine of course (I know I point out the obvious, but you can never be too sure, Expat said.....) and see it function. If it does not, you are probably looking at a compressor change and sorry to say, $$$$$$$$$
Matt