holen1

I did this to my 2013 Yukon Denali and I believe the 2012, 2013, and 2014 are the same. This gives me a display in the navigation screen and rear view mirror when it is reverse. To get a constant picture in the mirror you would need a switched 12v connection to the mirror via number 9 pin position on the mirror plug. You would also need to have the camera connected to a switched hot wire all the time. Run 2 wires from the plug on the back of the navigation head (easy to remove) attach a T tap to the blue wire and a T tap the white wire on the back of the nav unit that reside in the gray connector on the back of the navigation unit, one below the other in the connector plug, it, (the plug in connector could be brown) . Remove the home link - map light panel, just above the rear view mirror on the head liner by popping out the plastic lens and then remove 2 screws, pull the panel out, remove it. Then pull the mirror plug wiring harness back from the windshield and then down through the hole where the plastic panel was removed from the headliner which contains the home link and map lights. Separate the wires in the mirror harness and tap just the blue and white wires then plug in the wires from the navigation head. Remove the right passenger A pillar, 2 bolts under the caps on the passenger assist grab bar.Just run the 2 wires from the taps (blue and white) on the navigation head under the dash and then up the passenger A pillar. Then hide them in the headliner en-route to the blue and white wires respectively on the mirror plug. If terminal 9 on the mirror plug becomes activated with 12V or more when the shifter is placed in reverse then you will have the camera video image displayed in the mirror LCD and the navigation screen when all is connected. Video quality is not diminished by the dual connection. That should do it. Find other instructions for removing the bezel for the GMC factory nav. They are available at https://www. coastaletech.com/ under the GM2 installation instructions