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@grams
For intermittent there's a circuit that switches the motor on, and it'll run until they get back to the park position. It then waits a variable amount of time to power up the motor again. If you have intermittent at all, setting the delay between sweeps is solely a UI issue - i.e. you have to provide a knob.
On a lot of cars auto replaces intermittent, since it saves redesigning the stalk and it's basically doing the same thing with wetness replacing the knob position.