Don't know if this might help you out but I had the same problem. When I sent it in the tech said it was supposed to act like an in-line fuse. (Don't know why they couldn't put one on the out side?) The part number if you needed it is CDE7727. Hope this helps http://www.avic411.com/forum/viewtopic. ... ight=sound
Off topic, my fingers are cleaned just stained from being a mechanic that doesn't wear gloves