2012 with OEM head unit. I have paired the phone and made/answered calls, no problems. Is it possible to play music on iPhone and have it play on the car’s system?

 

Yes. Thre are several YouTube videos on how to enable ' BT AUX '

 

I didn't even know this was possible in our cars! I just followed this tutorial and it works!

Edit: it is slightly confusing that even though your phone is paired with PCM, you have to pair it a second time to get BT AUX to function. Just follow the video instructions.