There seems to be a bug with this regarding audio. I have a USB thumbdrive plugged into my car for music, and when I am using g.maps through android auto it switches me to phone audio and I have to keep switching back. It used to work properly where it lowered the volume of my music through the USB for the g.maps directions. I've made my car forget my phone, uninstalled AA, uninstalled programs that cooperate with AA, and factory reset both my phone and my car system. Nothing has fixed it.