Pioneer double din

[Big Flounder]

Any one here have any car audio experiance? I have the Pioneer AVIC-D3. It was installed 2 years ago and I've had no problems till now. I didn't start my truck all weekend and when it was parked Friday it was fine but when I got in it last night my highs and mids are very faint. When it was installed it was set up to when my seat belt chime went off to let me know it wasent on, my left side highs and mids would cut off and the chime would come through the speakers but now I don't even have the chime. All my mids and highs are powered by the head unit. My amp and subs are working just fine. Do you guys think I some how got an over night loose conection or something?