I just hooked up a Navigation Unit on my 07 SIlverad (LTZ Package, RSE, Bose Sound you name it I got it). Installation went fine. Had to take to dealer to get system programmed. I now have no OnStar or XM. Any help I could get would greatly be appreciated. Part #on Nav unit is 15940102.
:glasses: :gasp:
:glasses: :gasp: