Wiper and Washer Systems: Description and Operation

System Operation
1. Low speed and high speed
^ When the windshield wiper switch is moved to LO, current flows through the windshield wiper switch, to the windshield wiper motor, and then to ground. The wipers operate at low speed.
^ When the windshield wiper switch is moved to HI, current flows through the windshield wiper switch, to the windshield wiper motor, and then to ground. The wipers operate at high speed.

2. Autostop
^ While the windshield wiper motor is operating, the autostop switch is on. If the wiper switch is moved to OFF, current continues to flow through the autostop switch, to the intermittent wiper relay, to the one-touch switch, to the windshield wiper motor, and then to ground. Thus, the wipers keep moving until they reach the park position. When the wipers reach the park position, the autostop switch turns off and the wipers stop.

3. One-touch wiper
^ When the windshield wiper and washer switch is pushed, the one-ouch switch turns on and current flows through the one-touch switch, to the windshield wiper motor, and then to ground. The wipers operate at high speed for one cycle.
^ When the windshield wiper and washer switch is pushed and held, the wipers cycle at high speed. When the switch is released, the autostop function is activated and the wipers stop at the park position.

4. Intermittent wiper
^ When the wiper switch is moved to INT, the intermittent wiper relay is activated, and current flows through the wiper switch, to the intermittent wiper relay, to the one-touch switch, to the windshield wiper motor, and then to ground. The wipers operate at low speed. When the intermittent wiper relay internal circuit turns oft the relay, the autostop function is activated, and the wipers stop at the park position.
^ After the wipers stop, discharge from the capacitor inside the relay turns the intermittent wiper relay on again, and current flows to operate the wipers again.

5. Washer
^ When the windshield wiper and washer switch is pulled, the washer switch is turned on. Current flows through the washer switch, to the windshield washer motor, and then to ground. The windshield washer motor is activated.
^ Current also flows to the intermittent wiper relay, turning it on, and continues through the one-touch switch, to the windshield wiper motor, and then to ground. The wipers operate at low speed.
^ When the washer switch is ON for more than 1.5 sec., power is stored in the condenser inside of the intermittent wiper relay and so the windshield wiper motor continues to operate for 2.6 sec. after the switch is turned OFF. Then the windshield wiper motor returns to the park position due to the autostop function.