Somehow I never checked the rear wiper since I purchased the new JL. Yes I know I haven't done my homework. Anyways today it rained and so I turned on the rear wiper and I didn't see any wiper moving .I stopped the Jeep and ran outside to see what's going on. Well the wiper blade was turned about an inch to the left from its normal position ,it just slides down under the rear window edge and lands on the upper portion of the rear door which is slightly raised. And so then I called the dealer and he said maybe they installed the motor the other way and on Monday I am heading down to Chrysler to get it inspected by the experts.