I have installed, rewired all the navi components ,except rear camera, into my CTS coupe. It works turns on and all BUT.. Yess there is a BUT it's LOCKED!!!! I did it on my 2010 SRX with no reprogramming problems. DOES anyone know anybody who unlocks head units?? I tried to relearn the VIN to the HU but the bulletin just tells me to replace the radio. That means that the HU needs to be programmed at GM.. Can anyone help with this?