I have a 2011 gmc 2500Hd That has factory nav system but the dvd drive has gone out of it, had a neww dvd drive installed but the nav unit does not seem to recognize, does the truck have to be taken to a gm dealership to have to be programmed, the nav unit does work because installed new disc in but will not close door and start working. Doe anyone have any ideas ????
Thanks
Thanks
