Windshield Wiper/Washer System Components
The windshield wiper/washer system consists of the following components:
• | Windshield wiper/washer switch |
• | Windshield washer relay |
Wiper/Washer System Operation
The windshield wiper motor module is part of the windshield wiper motor
cover and controls the windshield wiper motor and washer pump operation. The
windshield wiper motor is a 2 speed motor and is operated at low speed in
all modes except HIGH. The accessory voltage supply circuit to the windshield
wiper motor provides the power for operating the wiper motor and the wiper
motor module. The windshield wiper switch supply voltage circuit is a 12-volt
reference from the wiper motor module to the wiper/washer switch. The WASH,
MIST, LOW, and DELAY modes are controlled by the windshield wiper/washer switch
through a series of internal resistors, and the switch position determines
the point on the resistor assembly where the reference voltage is applied.
The windshield wiper switch signal 1 circuit supplies the signal voltage from
the switch assembly to the wiper motor module which determines the operating
mode. Windshield wiper motor high speed operation is controlled
by the windshield wiper/washer switch through the windshield wiper switch
high signal circuit. The windshield wiper switch high signal circuit is supplied
12 volts by the wiper motor module and when the wiper/washer switch is turned
to the HIGH position the windshield wiper switch high signal circuit is grounded.
The windshield washer pump is controlled by the wiper motor module through
the windshield washer relay. The windshield washer relay coil and switch is
supplied battery positive voltage, and during WASH mode the wiper motor module
grounds the washer relay control circuit energizing the relay. While the relay
coil is energized battery positive voltage to the switch side of the relay
is supplied to the washer pump control circuit.