I am having a problem with the nav system, swapped out Bose radio with cd and xm for a Nav system from a 2009 denali yukon with bose and rse and backup camera, the problem I am having is I got the radio unlocked because originally it was locked from the swap. I have got it back and installed it everything works except that I have no warning buzzers or signal sounds and the volume on the radio is wide open and will not respond to the steering wheel controls or the volume knob on the nav unit, I was told I would not have to take to dealer for any programming because it should reset itself once you install on next vehicle. Does this require any extra programming and also does anyone know where a person can split the video cable signal for the backup cam?