Can someone please help me im trying to install a Dual xdvd9101 head unit in a 2009 pontiac g6. I have installed many head units but this one relle stumps me. I hooked up all the harness and amp and my box correct far as my knowledge but when I plug in my harness the radio and amp comes on and then shuts back of i have never installed one of these head units before and im pretty sure im doing something wrong can someone please help me i paid entirley too much for this system to not be able to use it.