First some background... my bike is a 2005 with ABS and CD Changer. I had two winter projects, one was to install lighted trunk & saddlebag moldings... the second project was to mount a ZUMO 450 on the clutch reservoir, which I wired to the accessory terminals in the fuse box. I also added a 6 foot cable for the speaker connections from the ZUMO to the connector under the left fairing pocket. Both projects seemed to go OK.
Since I had part of the bike disassembled anyway, after the ZUMO 450 project I removed the top shelf looking for something I dropped (never did find it). And while I can't be positive, I believe the audio system was working prior to and after the ZUMO installation. But, when I removed then replaced the top shelf, the audio system was stuck on AUX... and none of the audio controls worked except for the Volume and the Mode. To further confuse me, the Volume control on the handle bar doesn't work. So, I am essentially stuck in AUX mode which, by the way, plays my ZUMO mp3 files just fine.
I've made sure the two audio plugs under the top shelf are seated and I've checked the appropriate fuses... they are OK. Since I did the lighting project first, I pulled the fuses for the rear lights and brakes just to see if that might affect the audio system... it had no effect at all on the audio system (so I assume my lighting project was OK).
So, I'm basically at a point where I don't know what to check next (I hate to have to take to the Honda dealer for a fix).
Does anyone have any ideas on what I should check next?