It seems that even when wipers are turned off, they always cycle one more time at the moment of switching them off. The make or model of the car does not seem to matter.
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Wipers go back and forth between two positions, let’s call them left and right. Neither of these positions is the “stowed” position. There is one place on the cam that makes them go back and forth where if the motor reverses, the wipers are moved into the “stowed” position. When you turn the knob to “off”, they keep running until this spot comes around on the cam, and then the motor reverses to stow them. The place on the cam is not near either the “left” or “right” positions, because the load on the cam is high there and it might break if it was designed that way.
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