Tried over in the ECM board and didn't get anything, maybe someone here knows.

I have a 2001 ElectraGlide Classic that's had a code for a while now (6x turn signal flashes at ignition-on). It's still the same code now as it had back when I first pulled the code in February (with the ignition/turn signal dance): 31- Alarm output low. This bike doesn't have a security system installed. My dad bought the bike new in 2001 and never received any fobs, and to his knowledge (and our digging), there is no security system on this bike. I've owned the bike now since February, but since it's an alarm code and doesn't impact functionality, it hasn't been something I've really spent time worrying about clearing.

Does anyone know why this code may have cropped up, and how to clear it? It's been run for way more than 50 cycles, so I know it's a current code.