Have you tried pushing the AUX/Mode button in your car? In my car it says Mode. It is a larger button to the left of my Radio. It switches my raido to my I-Pod. And don't forget, you may have to play with the sound a bit. Sometimes, I have to really turn the radio up. Or, it my be a simple on/off swith that is in your phone settings. My phone also works. It is an android.
I don't know if you've tried any of this and I hope it helps. Good luck.