Wiper Will Not Shut Off

Disconnect wiring from terminals 4 and 5. Replace park switch assembly if motor stops. If motor still runs, remove wires from terminals 1, 2 and 3. Connect a 12 volt lead to terminal 1 only. If motor does not run it indicates a ground in wires from wiper motor to terminal 2 or 3 at dash switch. If it runs, check for internal ground in high or low brushes.