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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Because the switch doesn’t directly control the wipers. It controls an intermittent relay switch in between the dash and the wiper motor itself. When you turn off your wipers, you tell the relay to stop, but the relay has already sent power to cycle the motor. The cycle is already running, but now that you’ve flipped your switch, the relay won’t start another cycle.
Serves multiple purposes: gives you variable speeds on the wipers, ensures the wipers always run a consistent cycle, and keeps your view clear by making the wipers end at their start position.
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