Select AUX on the rear controls?

[llajumpvid]

I can not select the AUX or the DVD on the rear controls. I don't have a factory DVD so that would explain why I can't select the DVD. I can only get the AUX to light up if I turn off the rear control on the dash and select the AUX up front. Is it just mine or is that the way they all are? If it is thats irks me because I have my aftermarket DVD hooked into the AUX and want to be able to use the headphones for AUX in the rear and play the radio up front!

If this is the way its designed anyone know a way to wire into the system? I can select between two of the three AM, FM or CD depending on what is selected up front. I'd be willing to make all three devoted to the DVD if I had to in order to get the DVD audio through the rear IR headphones.