No matter what I search on here I have only found one thread for unlocking the DVD player to display while in motion. I'm not looking to watch movies while I drive, but my wife would like to see what's playing on the overhead TV mirrored on front dash screen from passenger seat. I remember seeing something about a particular wiring harness that should override this. I don't want to mess up any of the other features and just seeing if anyone else has done this without adding an aftermarket headunit. I have a 2012 Tahoe LTZ with entertainment package.