Just bought a 2010 Scion Xb and love it. It had an after-market stereo in it, and I just replaced it with the Pioneer PT546-00111. Years ago I had a Sony stereo with the USB iPhone hookup and I could toggle it to control the content that would play through my iPhone, and not by using the dials on the stereo. Anyone know if this is an option on the Pioneer Scion stereo?