when i pair my iphone with my car player via bluetooth or usb the voice is silent. it works on phonecalls and play music from spotify via the phone to the car player but the voiceover voice is silent. have no problem with the bluetooth headset have tested 2 different. every tip is welcome.
I have the same problem.
The iPhone maintains a memory of each thing you connect. Try initiating some Voice Over speech, and pressing the volume up button repeatedly while connected to your car.
I agree with DP
The voiceover volume is always much lower than the normal sound/volume that comes from a radio station or music in our car. I have also experienced the same when I connect my phone to my Bose radio via the auxiliary port. Turning up the voiceover volume has resolved the problem.