I have tried to listen to music through my car stereo using the output jack. After about a minute or sometimes 30 sec the music level drops with a bunch of odd audio noise so it is impossible to listen. My phone does not have this issue as it will function correctly. My radio only supports bluetooth for calls and not streaming, in case you were to suggest that. However, this works with my phone using the headset jack input to connect to the radio. But not the tablet. Also, it does not matter if it is plugged in charging or not.
NOTE***
Connecting to my radio via usb is not a problem, except that I can not see what music is playing as it is recognized just like a flash drive. Any help would be appreciated.