Audio not working through USB with iOS 10.02

If you're using USB Playback

1. Restart your iOS device and your car.
2. Connect your iOS device to a different stereo USB port (if you have one).
3. Try a different USB cable.
4. Update your iOS device.
5. Install any firmware updates for your car stereo.
6. Try playing audio from a different app. If you can't play audio from a specific third-party app, contact the app developer for help. If you can't play audio from an Apple app, contact Apple Support.

Get help connecting your iPhone, iPad, or iPod touch with your car stereo - Apple Support
Take care!

That reply is not helpful. The cable and vehicle are the same as prior to the update. Rebooting is fruitless. The iOS update has broken something with the USB communication to vehicle systems. Seeing reports of the issue on multiple car brands. Mine is a Nissan and failing just as described here.

Hi becky_s22,

i have the same problem with my car stereo in combination with iOS 10 and my iPhone 5s. The iphone is connected correctly, my car firmware is up-to-date and the radio is controlling the iphone as expected, meaning: I can start and stop the music and change the song but the sound is not transfered to the car stereo instead it plays on the iphone speakers. I tested this with the same setup and iOS 9 and it works great. I would assume it is a bug which was introduced with iOS 10, perhaps as an sideeffect of the carplay improvements.

Is there any useful tip or timeline when this will be fixed ?

Thanks in advance

UPDATE: I did yet another reboot of my iPhone (5S) and now the USB function is back to normal. This wasn't the first reboot I did, so I don't know why it suddenly began working. I'll see if it lasts.