Digging out an old thread here, I know, but I have the 2011 cx9 with navigation. It is new as of a week or two, and I had it working fine with bluetooth phone and a2dp audio.
I "installed" the ipod harness and box $230 ripoff combo, which doesn't work for some reason, and after turning things on and reconnecting the battery I lost audio over A2DP. I still have telephone, and it still thinks it is getting audio (the nav screen lets me pause/start/skip in pandora), but no sound comes out!
I am going nuts here. Any suggestions? Radio works for sound.