Installed a D3, nav works flawlessly, voice guidance too. Radio plays great. I ordered the i pod cable, plugged in the ipod, and the interface pops up, says its playing, no volume. I figured the iPod cable is no good, I was getting ready to return the cable, but i tried a dvd today, it played fine, but no volume, then i treid a cd, the display showed the play time but had no volume either. Is there a wire i may have missed? or a setting i didn't do right? I need any help i can get, thanks.