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Fortunately this is an easy fix. What has happened is when the battery was remove the rear window lost its auto timing which by default stops the wiper. With the key in the on position using the window switch on the instrument panel push and hold the down position on the switch until the rear window goes all the way to the open position and hold it for three seconds then go immediately to the up position and hold it until the window closes then continue to hold for three seconds. That will reset the window then see if the window operates normally and see if the wiper works.
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