I'm buying a used '98 Range Rover that has a Pioneer (obviously) F700BT, but it won't let me get into the System Menus, only the Audio and Sound menus. The other ones are all grayed out. I'm also not getting any FM reception (I don't think it's even connected) and it shows my iPhone 4, and shows the song that's playing, but I get no audio through the speakers. It will play CD's though. But I haven't been able to test anything else. Any idea what's going on?