My car has BT for 'phone' and 'audio'. I never play audio that way though. The problem is that when I get in the car and it BT connects, the phone auto brings up the music app and starts to play. I don't have the car head unit set for that input method, so the tunes go nowhere, but suck battery life. There is no way to tell the head unit to not use BT audio when connected. Is there a way to have the phone not bring up the music app when BT connected?