All--Item 66 "Socket" is shown directly under speedometer on wiring diag. (Owner's Manual "fold-out" occupying pages 113-114.) Socket has 2 male spade lugs on top, with socket opening pointed down, but socket is empty. There is a stripped black wire hanging nearby. Used a jumper to see if I could get continuity (light) between black wire and lugs. No luck, but got a faint "buzz" when I touched body of socket. Maybe relay "chatter??" Could Socket 66 be seat belt buzzer? Could it be courtesy light for driver's footwell (my overhead courtesy light works perfectly, even "time-delay" relay after I shut the door). Red "Brake" and "Fasten Seat Belts" lights don't work correctly, but I'm fine with their current set-up. I get red "Fasten Seat Belts" light when brake pulled, and when driving with or without belts fastened, "Fasten Seat Belts" is out. I never get red "Brake" light. There is NO courtesy light in passenger footwell, and I do NOT see "courtesy light" in wiring diag. Note that wiring diag. item 70 is "Interior light and switches", and 75 is "Timer for interior lights." (Why is it "lights" if only one in overhead???) Thanks in advance for any help.