Thread: Everything you ever wanted to know about auto dimming rear view mirrors

Great info! Is there a How-To for converting the 3 pin wire of a 2000 GTP to the 16 pin harness of an On-Star mirror? Cant seem to find one. Thanks !

Yea I am looking for the same thing. I bet that once power goes into the mirror the compass and what not will light up. I bet that all those other pins were for all the on star crap. So try to rind power for the overhead lights, for the mirror and the signal wire to disable the auto dimm in reverse and you should be good. I however, cannot even get the plastic cover off without breaking it but I have a strong rear window tint so Im ok with it for now. Once I get some of these pokers out of the fire, rebuilding second vehicle and fixing GTP I will post back here. Let me know if you figure it out please.