Car bluetooth disables navigation voice

[MathDroid]

I drive a VW Jetta with bluetooth, which has easily paired with my last two phones (Bionic and S4, respectively). While Google map's turn-by-turn map navigation works fine with my phone's bluetooth on, in so far as I can see directions on the map, the navigation voice is disabled. Only when my phone's bluetooth is off do I hear a voice. I'm not sure if this is a function of my phone or my car.

 

[Kimberly Hancher]

I have a galaxy s4 and drive a VW Tiguan. We have the same problem with the navigation voice won't play when the car bluetooth is paired with the phone. What is the solution?