Audio Systems: unlock nav sys, chev tahoe, rear camera

Question
how to unlock a touch screen on a navigation system for addresses on chev tahoe 2006

Answer
contact  
oemautosound.com
they have a kit that unlocks the gps ,lets you enter adress when driving
unlock the rear camera video in the screen
it also unlocks the factory dvd when driving
and unlocks the xm radio scrolling text

sorry don't have the name for the box
contact andy  

good luck