I have this problem of Bluetooth pairing and no audio all the time. The trick for me to circumvent the problem is to be patient. When you start the car, don't touch the radio until at least 45 seconds, then even wait a some more. Then when you switch the audio source to Bluetooth the audio will flow. I can recreate the problem every time with my iPhone SE. If I pair and try to play music too quickly, the display shows it playing, the phone thinks it's playing, but no audio. Once in this mode, the only way around it is to turn off Bluetooth on the phone, wait, turn it back on, wait, wait some more, then switch the source to Bluetooth and play.
The other thing to check is if your audio on the phone might be turned all the way down. I sometimes need to push my volume up buttons on the phone.
There's always the trusted analog headphone cable...that always works for music, not so much for phone features.
The other thing to check is if your audio on the phone might be turned all the way down. I sometimes need to push my volume up buttons on the phone.
There's always the trusted analog headphone cable...that always works for music, not so much for phone features.