ABS brakes

alright so last night i was driving and my ABS light lights up on my dash, when i got home the light was still on so then after i turn my car off i could hear the ABS system running under the hood. I just left it thinking that it would turn off in a while but then this morning when i went out to start my car, the ABS system drained my battery. Anyone know how to turn it off or disconnect it?

car: 1992 Nissan 240sx