I have a GMC Sierra with the built in nav/radio system. It has a USB port in the center console for iPod connections. I can hook up the iPod/iPhone and browse the music and control everything with the head unit or my steering wheel controls. At least I could until I tried my new iPhone 5. Now when I connect it I can only listen to podcasts. It doesn't see any of my music. I've tried opening the music app, starting a song, and then connecting it to force the issue. When the phone is connected I get the "iPod accessory connected" screen on the phone and can't do anything with it. The podcasts play fine, so I know it can transmit audio. Why not my music. Worked great with my iPhone 4. Thanks for any help.