2002 GMC Sierra

Electrical problem
2002 GMC Sierra V8 Two Wheel Drive Automatic 54000 miles

When the wipers are turned off they do not go all the way down to park position. I am concerned they will fail at a critical time as I tow a 5th wheel all over the U.S. I cannot find where the motor is located but I think the module is on the firewall. Also where is the washer pump? I appreciate any help you can give me
March 25, 2010.

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