GM Service Manual Online
For 1990-2009 cars only

Interval (Pulse) Operation

With the ignition switch in the ON position, B+ is applied to cavity 6 of the windshield wiper motor. With the windshield wiper/washer switch in the INTERVAL position, B+ is applied to cavity 3 of the windshield wiper motor. The length of delay time is determined by the interval switch. The windshield wiper motor operates the wipers for the desired delay.

LOW Speed Operation

With the ignition switch in the ON position, B+ is applied to cavity 6 of the windshield wiper motor. When the windshield wiper/washer switch is in the LO position, B+ is applied to cavity 3 of the windshield wiper motor. The windshield wiper motor operates the wipers at LOW speed until the windshield wiper/washer switch is turned to the OFF position.

When the windshield wiper washer switch is turned off, the mechanical pawl of the windshield wiper motor has B+ applied to cavity 5 until it moves to the park position. In the park position an open occurs through the windshield wiper motor cavity 6 and cavity 5, breaking the circuit.

HIGH Speed Operation

With the ignition switch in the ON position, B+ is applied to cavity 6 of the windshield wiper motor. When the windshield wiper/washer switch is in the HI position, B+ is applied to cavity 2 of the windshield wiper motor. The windshield wiper motor operates the wipers at HIGH speed until the windshield wiper/washer switch is turned to the OFF position.

When the windshield wiper/washer switch is turned OFF, the mechanical pawl of the windshield wiper motor has B+ applied to cavity 5 until it moves to the park position. In the park position an open occurs through the windshield wiper motor cavity 6 and cavity 5, breaking the circuit.