Circuit Description

Wiper/Washer System Electrical Schematics(Pulse And Rainsense):

PULSE OPERATION
With the wiper switch in DELAY (pulse), battery voltage is applied to the wiper motor connector at terminal "B" through CKT 243. Voltage also is applied to terminal "G" through CKT 478 and terminal "H" through CKT 477.

The length of delay time between sweeps is controlled by the variable pulse delay resistor in the wiper/washer switch. The delay is adjustable from 1 to 22 seconds, nominally.

RAINSENSE OPERATION
With the wiper switch in "AUTO DELAY" (Rainsense), battery voltage is applied to the wiper motor connector at terminal "B" through CKT 243. Voltage is also applied to terminal "G" through CKT 478 and terminal "H" through CKT 477. Anytime the ignition switch is in "RUN" or "ACCY," battery voltage is present at the rainsense module connector terminal 8 through CKT 443.

A pulse-width-modulated (PWM) signal is sent from the wiper motor cover to the rainsense module through CKT 482. The type of PWM signal sent is determined by which "AUTO DELAY" position is selected on the wiper/washer switch.

The rainsense module then sends a PWM signal back to the wiper motor cover on CKT 481. The type of PWM signal is determined by the input from the wiper motor cover and the amount of rain sensed on the windshield. The wiper motor cover receives the signal from the rain sense module and actuates the wiper motor accordingly.

LOW SPEED OPERATION
In the "LO" position of the wiper switch, battery voltage is applied to the wiper motor connector at terminal "B" through CKT 243 and terminal "H" through CKT 477. Voltage is also applied to terminal "G" through CKT 478.

HIGH SPEED OPERATION
In the "HI" position of the wiper switch, battery voltage is applied at terminals "B", "D" and "H" of the wiper motor assembly through CKTs 243, 92 and 477. Voltage also is applied to terminal "G" through CKT 478.

PARK POSITION OPERATION
When turned "OFF" from any position, the wipers complete the last sweep and park. When the wiper switch is in "OFF", the wiper motor assembly has battery voltage applied to terminal "B" only, from CKT 243. When the end of sweep switch opens, the control circuit reverses the wiper motor, which activates the external depressed park mechanism (crank arm) The wiper motor continues to run until the park switch opens.

WASHER OPERATION
When the washer switch is pushed, battery voltage is applied to terminal "G" of the wiper motor assembly through CKT 478. The wiper motor has voltage applied to it automatically by the wiper motor cover circuit board and operates at low speed during the wash cycle and then for two sweeps after the wash cycle is complete. If the wipers had been in "DELAY", "LO" or "HI", they would return to that operation after the wash cycle.

MIST OPERATION
When the wiper switch is turned to "MIST" and released, the wipers make one sweep at low speed and return to park position. If the wiper switch is held in "MIST", the wipers will continue to operate until the switch is released. In the "MIST" position of the wiper switch, battery voltage is applied to the wiper motor connector at terminal "B" through CKT 243 and terminal "H" through CKT 477. Voltage is also applied to terminal "C" through CKT 478.