In addition to the features of a conventional (non-pulse) wiper system (mist, low, and high speeds), the pulse-type windshield wiper/washer system includes an delay operating mode in which the wipers make single sweeps with a time interval between sweeps. The time interval is controlled by the winshield wiper pulse control module. The duration of the delay interval is determined by the delay resistor in the wiper/washer switch assembly.
When the wiper switch is turned off, the wiper motor returns the wipers to the park position.
Voltage is supplied to both the windshield wiper pulse control module and the windshield wiper switch from the WIPER fuse through CKT 143 (YEL) when the ignition switch is in the OFF, ACC or RUN positions. All signals from the windshield wiper switch enter the windshield wiper pulse control module through CKT 96 (BRN) at cavity F, except when the wiper switch is in high and then the signal is sent directly to the wiper motor through CKT 92 (PPL).
The wiper pulse control module, the wiper motor, and the washer pump motor are all grounded at G 200 through CKT 150 (BLK).
Low-Speed Operation
In the LO position of the wiper switch, voltage is applied through a fixed resistor to the pulse wiper module. The voltage is sent out through the wiper motor park switch output to the wiper motor which disengages the park pawl. The voltage is sent back to the pulse control module to the wiper relay coil input and the motor turns continuously in low speed.
High-Speed Operation
In the HI position of the wiper switch, ignition voltage is applied directly to the wiper motor assembly through CKT 92 (PPL). The motor turns continuously in high speed.
Mist Operation
When the wiper switch is moved to MIST and released, the wipers make one sweep at low speed and return to the park position. If the wiper switch is held in MIST, the wipers will continue to operate until the switch is released. The circuit operation is the same as that of low speed.
Delay Operation
When the wiper switch is placed in one of the delay positions, voltage is available to the pulse control module through one of five resistors. Depending on the amount of voltage received at the wiper pulse switch input, the module will delay output of voltage to disengage the park pawl.
Washer Operation
When the washer switch is turned to ON, ignition voltage bypasses the low speed resistor in the wiper switch and is sent directly to the pulse control module. The module uses this signal to activate the washer pump motor output and sends ignition voltage to the washer motor.
If the wipers had been in DELAY, LO, or HI, they would return to that operation after the wash cycle. If they had been in the OFF position, they would then return to the park position after 3-5 wipes.
