Wiper Motor Internal Circuit

There are two sets of windings in the motor to achieve the slow and fast speeds.

The "park" switch is used to supply power to the wiper motor after the normal wiper switch is turned off, and un till the wiper reaches the park position. Once the wiper motor reaches the park position, the park switch opens up, and the motor stops.

The timing used for the intermittent operation is done with electronic circuitry usually in a separate module.