No power to ac compressor

99 astro awd. the ac was working last week, the system is charged and does hold freon. when i jump the pessure sensor on the dryer it still doesn not come on. i checked all fuses and relays , all check ok. i do have 12v+ coming into the switch on the back of the compressor and returning out so i know that switch is closed. i do have a ground at the power plug ontop of teh comessor. when i give the green wire +12v with a power probe the compressor comes on and tha ac blows cold. i beleive the ac switch is working because when its on ac i get the 12v+ to the switch on back of compressor, i have no idea what that switch does. when i turn switch of i lose the +12v. any suggesions? thanks joe donato

after reading i found out the switch on back of compressor is the high pressure switch, it is closed and is getting power in and out of it. hope this helps

problem solved,, green/white wire pulled out from vcm under hood in plug labeled white.