Blinking red light blinking abnormally fast

Hey guys. I noticed today when I turned off my car, got out and locked it, that the little red light on the top left of the dash was blinking super fast. Like a couple times a second. My first instinct is battery issues but I honestly have no idea. Any help or input is appreciated.
Cheers boys.
2000 civic SE btw
Light actually comes on even when the car door isnt closed or locked. Idk if that makes a difference based on what I said before.