bought this Honda about a year ago, It has no aftermarket alarms, plug ins, ETC.. The Battery drains every day lets say it is 13 V one day, the next day it is 12.5 day after 12.0 and so on.. the battery is new and the alternator is charging with no issues.. I even tried unplugging alternator and the drop continued each day.. the other day I removed fuse #15 under the hood "back up acc" and the battery drain has now stopped and battery is holding its charge.. does anyone know what "backup fuse acc" controls as far as fuses in the panel? any idea what this could be? I hear lots of radio horror stories, but this radio is fine and does not go on by itself or do anything weird, I even tried pulling that fuse after hearing all the horror stories with Honda accord radios and even with the radio fuse pulled the battery drain did not go away

Thanks for any input! if I find it on my own I will post the solution

 

That is a big fuse protecting a bunch of different circuits and fuses. Fuses 5 through 9 are protected by the #15 fuse, so plug in #15 and pull 5 through 9 one by one to narrow down the culprit.

 

Did you ever trace the draw down? I am having the same problem in my 02 accord have not been able to trace it beyond the 40 amp back up acc fuse as long as i pull it every time I park the car it will start , mine is linked to radio, door locks, immobilizer, front and rear running lights, not headlights ( blinkers, brake and reverse still work though) My draw down some how effects the immobilizer as it will not start due to no green key flashing on startup, I can pull the fuse and it will start though with no green light flash.