A lot of people have cured this witha new multifunction(wiper) switch. If you can unplug switch harness and motor quits that should indicate bad switch.
March, 8, 2011 AT 1:05 PM
I have a different opinion on that problem. Of course the wiper motor is going to stop when you remove all the power sources however the problem is usually caused by the pulse/park circuit board which is attached to the motor. The motor gets constant power so it is able to park itself when shut off.