You are going to have to break down and check the wiring to it. Most likely the switch is bad, you can pull up a diagram and make sure power and ground exists only when it should with the switch in several positions to accurately diagnose it.
Replace the wiper regulator. It's on the passenger side by the firewall. But before you replace it. Look at it. There is a small spring loaded catch. this catch rarely goes bad. But what it supposed to catch is a small metal arm., at the base. Sometimes the arm breaks off(replace the regulator) most times it just bends out of the way. bend it back to 90 degrees.
Have you checked the park-sensor?
WINDSHIELD WIPERS
It
can be faulty wiper motor or blown wiper control fuse.
Do
you hear any kind of noise when you starter the wiper function. If yes then
fuse is ok, but issue is wiper motor.
If
no movement at all and no noise then its blown fuse or shorted/loose wiper
control wiring: -----
For
complete troubleshooting i suggest you few helpful links with accurate
solutions.
-------------
Click
the link below: -------
1993 Ford F350 wipers not working?
http://repairhelpcenter.blogspot.in/2012/02/1993-ford-f350-wipers-not-working.html
------------
How to Replace a Windshield Wiper Motor
http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-windshield-wiper-motor.html
------------
Wipers not working, but hear relay click on Lincoln LS?
http://schematicsdiagram.blogspot.com/2011/12/wipers-not-workingbut-hear-relay-click.html
-----------
Car windshield wiper gets power for movement and stops?
http://schematicsdiagram.blogspot.com/2011/12/car-windshield-wiper-gets-power-for.html
----------
How does cars Windshield Wiper System Works
http://technoanswers.blogspot.com/2011/11/how-does-cars-windshield-wiper-system.html
---------
1997 Honda Protege: Replace Wiper Transmission?
http://technoanswers.blogspot.in/2012/06/1997-honda-protege-replace-wiper.html
----------------
Windshield wiper fluid container leaking?
http://whatisbyme.blogspot.in/2012/05/windshield-wiper-fluid-container.html
-----------------
Where is wiper fuse located on1993 chevrolet suburban
http://technoanswers.blogspot.in/2012/02/where-is-wiper-fuse-located-on1993.html
------------
2002 Toyota Sienna: Wipers and Passenger side Power window
stopped working?
http://technoanswers.blogspot.in/2012/04/2002-toyota-sienna-wipers-and-passenger.html
-------------
Complete wiper components replacing details for Acura Car
Models?
http://repairhelpcenter.blogspot.com/2011/11/complete-wiper-components-replacing.html
------------
These details will help.
Thanks.
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