Wiper/Washer System Operation Pulse
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 operating mode in which the wipers make single sweeps with an adjustable time interval between sweeps. The time interval is controlled by a solid-state timer in the wiper motor assembly. The duration of the delay interval is determined by the delay resistor in the wiper/washer switch assembly.
The wiper motor is protected by a circuit breaker. If the wipers are blocked (by snow or ice, for example), the circuit breaker will open the circuit. The circuit breaker resets automatically when it cools.
Pulse Operation
With the wiper switch in DELAY (pulse), battery voltage is applied to the wiper motor cover assembly at terminal B of connector C1 through the GRY/BLK wire. Voltage also is applied to terminal F through the PNK/BLK wire and the pulse delay resistor in the wiper/washer switch assembly. The battery voltage at terminal B energizes the park switch, which closes its contacts. In response to the voltage at terminal F, the solid-state timer momentarily closes contact A, which applies battery voltage at terminal B to the contacts of the park switch to start the wiper motor.
A cam operates contacts in the wiper motor cover assembly, which causes contact A to open when the wipers have completed their sweep. Since the park switch coil remains energized, the wipers do not park but remain just above park position until the cover assembly circuitry closes contact A again to start another sweep.
The length of delay time between sweeps is controlled by the pulse delay rheostat. The delay is adjustable from 1-25 seconds.
Low-Speed Operation
With the wiper switch in LO, battery voltage is applied at the wiper motor cover assembly connector C1 terminals B and C through the GRY/BLK and DK GRN/WHT wires. The park switch is again energized and battery voltage is applied to the park switch contacts and the wiper motor, which runs continuously.
High-Speed Operation
With the wiper switch in the HI position, battery voltage is applied directly to wiper motor connector C2 terminal A without passing through the park switch contacts. Terminal A is connected to a separate wiper brush for high speed operation. The park switch coil remains energized in the HI position because of the voltage present at the low-speed brush to the park switch coil is completed through the wiper/washer switch assembly. An open in this circuit will cause the wipers to cycle in and out of park position in the HI position and possibly prevent LO speed operation.
When turned off from HI, the wipers complete the last sweep at low-speed and park. To do this, the wiper motor receives voltage in the OFF position of the wiper switch, which is applied through the DK GRN/WHT wire to terminal C of connector C1. The park switch is de-energized when the wiper switch is moved to OFF, but the contacts remain closed until the wipers reach the park position.
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. The circuit operation is the same as that of LO.
Washer Operation
When the washer switch is pressed, battery voltage is applied to the wiper motor cover assembly through the PNK/BLK and GRY/BLK wires. The park switch coil is energized by the battery voltage at terminal B of connector C1. The solid state timer turns on the washer pump and the wiper motor off approximately six seconds after it interrupts power to the washer pump. If the wipers had been in DELAY, LO, or HI, they would return to that operation after the wash cycle.
Wiper/Washer System Operation Rainsense
In addition to standard wiper/washer system features, the Rainsense system automatically operates the wipers when rain is sensed on the windshield. This system operates only when the wiper/washer switch is in one of the AUTO DELAY positions. The speed and the duration of wiping is controlled by the Rainsense module and the wiper motor cover. The Rainsense module, which is adhered to the windshield, which is adheared to the rear-view mirror, senses the amount of rain immediately in front of it on the windsheild.
The wiper motor is protected by a circuit breaker. If the wipers are blocked (by snow or ice, for example), the circuit breaker will open the circuit. The circuit breaker resets automatically when it cools.
Rainsense Operation
With the wiper/washer switch in one of the AUTO DELAY positions, voltage is applied to the Rainsense module connector terminal 6 through the PNK wire. This voltage first passes through one of five parallel resistors in the wiper/washer switch. Which resistor the voltage passes through is determined by which AUTO DELAY position the wiper/washer switch is in. Turn the wiper/washer switch toward OFF to reduce sensitivity. The amount of voltage the Rainsense module receives controls its level of sensitivity.
Battery voltage is applied to the wiper motor cover assembly from the wiper/washer switch at terminal C of connector C1 through the GRY wire. The Rainsense module sends voltage to the wiper motor cover on terminal G of connector C1 through the LT GRN wire for automatic low-speed wiping. The Rainsense module sends voltage to the wiper motor cover on terminal F of connector C1 through the LT BLU wire for automatic high speed operation.
A cam operates the contacts in the wiper motor cover assembly, which causes contact A to open when the wipers have completed their sweep. Because the park switch coil remains energized, the wipers do not park, but remain just above park position until the cover assembly circuitry closes contact A again to start another sweep. The length of time between sweeps is controlled by the amount of rain the Rainsense module senses and the AUTO DELAY position selected on the wiper/washer switch.
Low-Speed Operation
With the wiper switch in LO, battery voltage is applied at the wiper motor cover assembly connector C1 terminals C and H through the GRY and DK GRN wires. The park switch is again energized and battery voltage is applied to the park switch contacts and the wiper motor, which runs continuously.
High-Speed Operation
With the wiper switch in the HI position, battery voltage is applied directly to the wiper motor connector C2 terminal A without passing through the park switch contacts. Terminal A is connected to a separate wiper motor brush for high speed operation. The park switch coil remains energized in the HI position because of the voltage present at the low speed wiper motor brush when voltage is applied to the high speed brush. The current path from the low speed brush to the park switch coil is completed through the wiper/washer switch assembly. An open in this circuit will cause the wipers to cycle in and out of the park position in HI and possibly prevent low-speed operation.
When turned off from HI, the wipers complete the last sweep at low speed and park. To do this, the wiper motor receives voltage in the OFF position of the wiper switch, which is applied through the DK GRN wire to terminal H of connector C1. The park switch is de-energized when the wiper switch is moved to OFF, but the contacts remain closed until the wipers reach the park position.
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. The circuit operation is the same as that of low-speed.
Washer Operation
When the washer switch is pressed, battery voltage is applied to the wiper motor cover assembly at terminal C of connector C1 through the GRY wire. Battery voltage is also applied to the Rainsense module at terminal 6 of the Rainsense module connector through the pink wire. Voltage is then applied from the Rainsense module to the wiper motor cover at terminal G of connector C1 through the LT GRN wire. The park switch coil is energized by the battery voltage at terminal B of connector C1. The solid state timer turns on the washer pump and wiper motor by closing contacts A and B. The solid state timer turns the wiper motor off approximately six seconds after it interrupts power to the washer pump. If the wipers had been in the Rainsense mode, LO, or HI, they would return to that operation after the wash cycle.
