Water pump (Opel Vectra B)

The water pump supplies liquid to both the windshield and the rear window. To ensure the desired direction of supply, the pump's poles change in each case, i.e. the "+" and "-" contacts change places, which occurs in the wiper switch depending on the direction of pressure. Then the dry cleaning of the glass is controlled by a multi-timer.

(Source is on this resource: «opelbook»)