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Try here youll get most of you answers here, http://www.chevroletforum.com/archive/threads/how-to-install-oem-nav-on-2007-tahoe-5604-1.html Should be the same for the caddy. I just did mine last month on my 08 avalanche. If you have any ??? email me Ill try to help. [email protected]

I have wires coming out of pins # 8 and 16 what are these pins for????

Ok looking at the back of the unit is C1 the first plug colored black on the left first set?? If so my pin 5 is already being used do I slice in to that connection??? Durrrrr, I figured it out thanks