Either bad connection to body control module or intelligent power module(under hood fuse box) or bad components themselves. Check all connection to body module, power module, wiper motor. If any corrosion in any connection, clean and apply dielectric grease. If no change then may be a bad power module, body module, or wiper motor. The wiper motor also has a sensor in it that puts it in park but may not be functioning properly when wipers are turned off so it can't park the wipers. Included are diagrams for reference.
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Wednesday, February 5th, 2014 AT 5:39 PM