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How the Circuit Works
Low Speed
With the ignition switch in ON (II), battery voltage is
applied to the windshield wiper motor through fuse
8 (in the under-dash fuse/relay box), and to the
windshield wiper/washer switch through fuse 12 (in
the under-dash fuse/relay box). When you move
the wiper switch to LOW, the low speed winding of
the motor is grounded through the low contact of
the wiper/washer switch, and the wipers run at low
speed.
Park/Off
When you turn the wiper switch to OFF, ground is
provided for the low speed winding of the
windshield wiper motor through the wiper switch,
intermittent wiper relay, and the cam switch on the
motor, to G301. The wipers then run at low speed
until the cam switch on the motor moves to PARK,
removing the ground, which stops the wipers in the
park position.
High Speed
When you move the wiper switch to HIGH, the high
speed windings of the windshield wiper motor are
grounded through the HIGH contact of the wiper/
washer switch, and the wipers run at high speed.
Mist
When you push the wiper/washer lever up and
hold it, the high speed winding of the windshield
wiper motor is grounded through the MIST contact
in the wiper/washer switch. The wipers will sweep
at high speed as long as you hold the lever up.
When you release the lever, the PARK/OFF
function then takes over, and the wipers stop in the
PARK position.
Washer
When you pull the wiper/washer lever toward you,
battery voltage is applied to the windshield washer
motor and the CPU in the gauge assembly. The
CPU grounds the coil of the intermittent wiper relay.
The relay, in turn, grounds the low speed windings
of the wiper motor. The washer motor then pumps
washer fluid onto the windshield, and the wipers
run at low speed. When you release the lever, the
wipers make one more sweep and then stop.
Refer to the Service Manual (Section 22, Body
Electrical) for testing and troubleshooting
procedures.
Intermittent
When you move the wiper switch to INT, battery
voltage is applied through fuse 12 (in the
under-dash fuse/relay box) and the windshield
wiper/washer switch to the CPU in the gauge
assembly. The CPU sends a signal to the
wiper/washer driving circuit, which energizes the
intermittent wiper relay by applying a ground signal
to the relay coil. The wipers then make a single
sweep every few seconds.
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