Windshield wipers

While driving, the windshield wipers on my 2000 Saturn sometimes come on without me turning them on and they continue to operate for several minutes after being turned off. What is causing this and is it an easy fix?

The trouble is most likely with the park switch inside the motor so replacing it should fix the problem if that is the case. The trouble may also be with the control switch. Checking the voltage from the switch while it is turned off and while the trouble is occuring would show if that is true or not.