I have a stock mirror currently with nothing on it and i want to replace it with the one that has onstar/temp/compass/auto dimming. Now i dont want the onstar even though i think it doesnt even work on these cars. My car is a 2002 GT without a sunroof. is there a wiring diagram for the wires above the headliner. I think i can hook the power up to just any 12v supply, and then ive heard about some wires under the hood somewhere that you connect for the temp sensor or something. If I could get some help it would be greatly appreciated.