Problems with the wiper parking circuit or wiper motor can cause the windshield wipers not to stop in the proper position.Google+
Car Problem Reports
Chrysler Town & Country Wipers don't stop in proper position due to wiper parking circuit/motor problems
Chrysler Town & Country Problem
Average Mileage: 148,000 mi (112,000 mi - 198,000 mi)
Visitor, 2000 Chrysler Town & Country, 134,000 mi
Wiper does not stop when wipers are turned to off position. Sometimes wipers continue to operate even after key is removed from ignition.
Visitor, 2006 Chrysler Town & Country, 112,000 mi
My windshield wipers won't shut off have to in hook battery to stop them
Visitor, 1996 Chrysler Town & Country, 198,000 mi
The winshield wipers have a mind of their own! I haven't fixed it!