My fiance's '95 Cutlass Ciera's ABS light had been on continuously for more than 3 years. Off and on I would try to figure it out with no luck. Was searching for info on what scanner may work and also for any helpful general info on on the net....when I came upon a posting(Don't remember where I found it...but if he reads this, thank you :

: ) from a guy with the same car and symptoms...ABS light continuously on which also kept the cruise control from working. ABS continuously light on defaults to normal breaking power. The solution that worked for him....The 3'rd break light bulbs were out(blown, not shorted or anything)! I ran out to the car, and much to my liking, the 3'rd break light did not work. Checked circuit, 2-bulbs(1141's), had power, bulbs burnt out. I "flew" to the parts store, bought 2 new bulbs, put them in, started car...
ABS LIGHT WAS OUT!!!!! While driving home checked cruise, IT WORKED!!!! Was wondering if this has been posted before and hope it helps some people.