Yep the little light coming on then going off when you start the motor is supposed to mean that the ABS is functioning.

Here in Phoenix it doesn't get too slippery so mine is unplugged. Come to think of it I was fine at the Snowbowl in Flagstaff last winter. If the `91 and `94 systems are the same then the online `94 FSM should have a complete system checkout procedure. I don't have the link for the FSM handy but you should find it on this board or yota. Good luck.