I just installed my avic-d1 in my scion, But I also kept my alpine 9855. I am using my 9855 for all the audio functions (xm,cd,dvd,) and using the avic-d1 for navigation ONLY. I was wondering if anyone here knew how I can have my 9855 mute when the navigtion on the avic is speaking?? Can you use the phone mute wire on the 9855 to mute when the navigation is speaking?? if so what wire would I hook to it from the avic-d1 thanks. in advance..