Emergency exit light and beeper

[Tammy02187]

I have an 09 I C school bus,does anyone know what or which exit is attached to that dash light and beeper, it's driving me nuts cause I can't figure it out!...HELP!...Ihave checked all the exits, all the switches are closed. I think it may be the rear door which doesn't have a switch, just the wires; can't find a combination of connection to shut either light or beeper off!, three wires, white, black, and two pink ones...I'm stuck on stupid right now!