Pulse Operation

With the wiper switch in DELAY (pulse), battery voltage is applied to the wiper motor through the ignition positive voltage circuit. Voltage also is applied through both wiper speed signal circuits.

The length of the 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.

Rainsense Operation

With the wiper switch in AUTO DELAY (Rainsense), battery voltage is applied to the wiper motor through the ignition positive voltage circuit. Voltage is also applied through both wiper speed signal circuits. When the ignition switch is in RUN or ACCY, battery voltage is present in the ignition positive voltage circuit of the outside moisture sensor connector.

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

The outside moisture sensor 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 outside moisture sensor 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 through the ignition positive voltage circuit. Voltage is also applied through both wiper speed signal circuits.

High Speed Operation

In the HI position of the wiper switch, battery voltage is applied to the wiper motor through the ignition positive voltage circuit and the high speed input circuit. Voltage is also applied through both wiper speed signal circuits.

Mist Operation

When the wiper switch is moved to MIST and released, the wipers make one sweep at low speed and return to park. The circuit operation is the same as that of low speed. 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 through the ignition positive voltage circuit and both wiper speed signal circuits.

Washer Operation

When the washer switch is pushed, battery voltage is applied to the wiper motor through the wiper speed signal circuit, 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.