So after about 7 visits to different dealers, no one can diagnose a gremlin that causes my a/c to come on when the car is parked. Plugged in/not plugged in locked or unlocked. When I hear it on the garage, I can open the door and the a/c light is on and I can press it and it goes off. This is without the key present, thus the car is not 'on'. Anyway, I have given up on this problem, so I am want to tackle it another way. I am looking for a wire I can put a relay on that will prevent the compressor for being able to turn on when the ignition is off. Would anyone have an idea how to locate such a wire ?