Permanent Magnet Motor

Fig. 12 Permanent magnet type windshield wiper motor. 1985---87 Astro Van & Safari:

1985---87 ASTRO VAN & SAFARI MODELS
The wiper motor consists of a permanent magnet positive park pulse wiper, a washer pump mounted under the washer bottle and a turn signal type wiper/washer switch. The die cast aluminum housing of the wiper provides superior cooling of internal parts, Fig. 12.
An electronic circuit board controls all the timing and washer commands. When the washer button is pushed for more than .3 seconds, a demand wash is performed in 1.5 second intervals for as long as the button is held followed by approximately 6 seconds of dry wipes and a shut off.
Turning switch to either the ``Lo'' or ``Hi'' speed position completes the circuit and runs at that speed. The pulse and demand wash functions are controlled by a plug-in printed circuit board enclosed in the wiper housing cover. Turning switch to the ``Pulse'' position operates the motor intermittently and the delay can be varied by rotating the switch. An instantaneous wipe can be obtained by rotating the switch to the ``Mist'' position and a continuous wipe will be performed if the button is held.