I have a 04 Armada that I got new just last week. It has everything(Nav and all)but it doesn't have Sat radio, where the button should be it says AUX. Can I switch the Head unit that I have with one that has sat and install xm in my car? has anyone done this? and where did you get the radio from. I've talked to a nissan part deportment but they just give me the run around, but I think that you can do it. Does anyone know?