My Buick LeSabre, 2000 model, has had the wiper motor replaced 3 times in an attempt to solve this problem. The multi-switch has also been replaced. The rain sensor on the windshield was disconnected after the 3 motors were put in just to eliminate a potential cause. It is plugged back in now.
The problem is intermittent as well. When you are driving, the wipers engage and nothing will stop them.
The car has a little less than 80,000 miles on it.
Any and all help is most appreciated.