Windshield Wiper Motor

A 2-speed windshield wiper motor operates the pulse-type windshield wiper. The wiper switch on the multifunction lever controls the wiper motor.

In the HIGH mode, the windshield wiper motor operates at high speed without any delay after the end of a wipe cycle. When the motor operates at any other mode, the motor operates at low speed. The motor uses a variable time delay between wipe cycles in order to reduce the wipe frequency.

The solid state logic of the windshield wiper motor determines the variable delay. The variable delay is based on the input voltage in CKT 96 (BRN) from the wiper switch. Various resistors in the wiper switch divide the voltage seen by the windshield wiper motor's fixed internal resistance.

A higher switch resistance produces a lower input voltage at the motor. The solid state logic also contains logic that returns the wipers to the fully down position, after the windshield washer switch is placed in the OFF position.