GM Dude

I'm not sure about the 2010 but I would assume it is the same as my 2011. Right above the drivers side kick panel and towards the door opening you will see a connector that has a white, blue and an uninsulated wire (shield). You can tap into the white and blue wires and run it to your nav unit. You will have an image in both the mirror and the nav unit or you can disconnect the connector and tap the wires that are routed behind the kick panel and run to your nav unit and you will have video in the nav unit only.