I just checked on my Maxidas scan tool and there is an option to do the vin relearn on the Nav radio. Too bad you're so far away, I would be glad to do it for you.Hi Where are you? I am in Kamloops BC.. I still have not insttalled mine permanently , I tried it and of course it showed the arrow and said it was locked. so put my old 6 disc one back. I found out with pictures of the harness that it does need an antenna so ordered one with the right plug. I heard you have to put a wire to the vehicle speed sensor and been looking on how to do that part of it . soon I am going to pull the dash apart again to see if there are any hidden plugs hanging around to fit it.. Also someone said that certain code readers will program these.. $100.00 to get gm to do it..