Thank you for all your responses. I wanted to elaborate a little further. One of the features I am reading about is the Driver Specific Presets. On the inside of the Door handle there are two buttons for the driver numbers. When the driver number is pressed, the seat moves to that drivers seating position, and the radio loads with that drivers presets.
I assume that this function is controlled through an interface on the head unit. But if I put in an alternate head unit, is there a specific feature I should be looking for to maintain that functionality?
Also, in one of the Illustrations, the Heads Up Display is shown with the Radio Station Displayed. Does anyone know if this is also a function of the Head Unit? I figured somethng this specific would simply be a function assigned to one of the wires in the harness, and that any aftermarket should be able to reproduce that effect.
Also please advise if I should be posting this in the GXP Forum.