The stereo volume is controlled separately from the nav and phone volume. To increase the nav and phone volume, go into your settings and select system settings, then volume. Ensure that the mute button is not selected, otherwise, no matter how loud your volume is set, you will not hear nav or phone. If the "mute" button is not selected, try raising the volume settings for both nav and phone (which you can do independently of each other.) If this doesn't work, check with the dealer for another solution. Good luck.
