Question android auto device audio output selection issue

[maverick353535]

hi guys,

I have recently bought a multimedia screen for my car and when i switch on android auto on this device via my phone, even i connect my car's radio bluetooth too to my phone, audio comes out from the multimedia device speaker all the time whereas I want to have the sound directly from car's speakers instead of multimedia device speaker. I tried to switch bluetooth priority on my phone too, but nothing. Multimedia screen device actives automatically its bluetooth connection on my phone. How can I resolve this issue? thanks in advance