A/C Compressor Clutch

Air compressor clutch dose not engage(no power to it)
I have traced the problem to the A/C enable relay it is not swithing now the problem I dont understand is that the coil on the relay has 12V going to it on both sides ???????? one side should be negative.
one wire comes from from a 10 amp fuse the other one the one that I think may be the problem come from the heater control module 20amp positive and gose threw the A/C low pressure sw and the A/C high pressure sw and then to the vehicle control module from there to the A/C enable relay coil the only thing in my wireing diagram is that when the wire goes into the vehicle control module as a positive what happens to it does it stay positive or what dose it do my info im getting comes from my Haynes manual section 12 page 41 I know this is complacated but I hope someone can help

the problem might be a little vacuum hose behind the a/c switch. it must be plugged for proper a/c power.if u cant find where it plugs then just tape the opening of the hose and that will trigger a/c to work. good luck.

I have check all kinds of resorces and what I have come up with is a leak and with lost of presure the presure swithes will not let the compresor run so I will have a leak check done and a recharge and see if that dose the trick