WIPER/WASHER SYSTEM
1988 Jeep Cherokee
1988 Wiper/Washer Systems JEEP
All Models
DESCRIPTION
Jeep vehicles use a 2-speed electric motor, which is a compound wound (series and shunt) type. A crank arm, attached externally to gear shaft, operates linkage which activates wiper blades.
All models have an optional intermittent feature. All models use an electric washer system consisting of a motor, reservoir, and necessary hoses and nozzles.
Some Cherokee and Wagoneer models are equipped with rear wipers. The rear motor is a single-speed motor with an automatic park feature. The circuit is protected by a separate 4.5-amp circuit breaker attached to brake pedal support.
TROUBLE SHOOTING
WIPER INOPERATIVE OR OPERATES AT ONE SPEED ONLY
1) If
wiper does not operate on either speed, check for
binding or
interference of linkage. If okay, place wiper switch on
"LO"
and then on "HI" setting. Connect a test light between
terminals
of wiring harness plug that connects to motor.
2) Check
for power at White wire with tracer and Black
(ground)
wire terminal for low speed. Check between Dk. Blue with
tracer and Black wire terminal for high speed.
3) If
light does not glow, check ignition switch, wiper
switch,
harness or terminals for open circuits. If light glows, check
for
loose or misaligned connection between wiring harness plug and
motor
plug. If okay, replace wiper motor.
WIPERS DO NOT PARK
Disconnect
motor and connect Gray lead to White lead.
Apply 12 volts
to Blue lead. Replace motor if it fails to park. If it
parks,
turn ignition switch on, and wiper switch to "PARK".
Connect
a test light to Lt. Green wire with tracer
and to
ground at motor plug.
Check
continuity between Tan wire with tracer and White
wire with
tracer.
If test
light does not glow, check harness connections
between motor and
instrument panel switch. If okay, replace panel
switch. If not
okay, repair harness connection.
WIPER MOTOR QUITS WHILE WIPING
With
engine idling and blower motor on high, operate
wipers
at high speed setting for 5 cycles
consisting of 3 seconds of
water and 57
seconds of drying.
If motor
struggles to a complete stop, clean glass and
replace blades.
Repeat test. If motor stops, test circuit breaker in
panel
switch. If motor stopped suddenly in original test, check
circuit
breaker. Repeat test. If motor stops, replace motor.
ALL FUNCTIONS OKAY EXCEPT INTERMITTENT WIPE
If blades
stop and start erratically, test circuit
breaker. If okay, check
wiper switch continuity. If continuity is
present, check
continuity of wiring between switch, governor and
ground. Repair
wiring or replace governor as necessary.
If
operation is intermittent on low speed only, check for
loose
connections at governor by disconnecting governor and
connecting
switch directly to instrument panel harness.
If all
functions except pulse and mist work, replace
governor. If
functions are not okay, recheck wiring and replace
governor.
WINDSHIELD WASHER DOES NOT OPERATE
If motor
runs but does not pump, check fluid level. If
level is okay,
check for split, loose, pinched or kinked hoses. Check
for
restrictions at nozzles. Check for reversed wire leads to motor.
If motor
does not run, check for blown fuse. Replace fuse,
if necessary.
If fuse is okay, disconnect plug at reservoir and check
for power
by connecting a test light across connector terminals.
Energize
washer circuit by closing washer and ignition switches.
If no
power is present, check for open ground wire or
defective
wiper/washer switch. Repair or replace as necessary. If
power is
present, reconnect plug to motor and check for tight
connection.
If motor does not run, replace pump motor.
REMOVAL & INSTALLATION
REAR WIPER SWITCH
Removal & Installation
Remove instrument panel bezel and switch housing panel.
Disconnect switch connector, slightly depress switch mounting tabs and remove switch. To install, reverse removal procedure.
REAR WIPER MOTOR
Removal & Installation
Remove
wiper arm from pivot pin by depressing tab and
pulling arm
straight out. Disconnect washer hose. Remove pivot pin
retaining
nut and interior trim panel. Remove rear wiper motor
attaching
screws and remove wiper motor.
To
install, reverse removal procedure. Wiper blade should
be
parallel to window in parked position (3/8-3/4" from
bottom of
window) and come no closer than 3/16" to
window seal when operated on
a wet
window.
WINDSHIELD WIPER MOTOR
Removal & Installation
Remove wiper arm assemblies by lifting blades off windshield and pulling out tab that locks blade in up position. Remove cowl trim panel. Disconnect washer hose. Remove cowl mounting bracket attaching nuts and pivot pin screws. Disconnect wiring harness and remove wiper motor. To install, reverse removal procedure.
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