I have had installed a JVC KW-V930BW head unit which works fine except that Android Auto is not using the attached microphone plugged into the unit, instead it is using the phone's speaker. I have conformed this by placing a pillow over the phone , at this stage it will no longer respond to my "hey google" command.
I suppose that the options are to try another mic but that would mean taking it back to the installer of the head unit who is quite a distance from me. He said he definitely remembered connecting the mic but who knows.
It is entirely possible I have not set something correctly on the phone or the head unit but nothing is jumping out at me.
Anyone know if there is some special thing I need to do to activate the mic?