Description And Operation - Jeep 1997 Grand Cherokee Service Manual

8K - 2 WIPER AND WASHER SYSTEMS
DESCRIPTION AND OPERATION (Continued)
The washers will operate only when the ignition
switch is in the Accessory or On positions. A circuit
breaker located in the junction block protects the cir-
cuitry of the washer system. Refer to the owner's
manual for more information on the windshield
washer system controls and operation.
REAR WIPER AND WASHER SYSTEM
A rear wiper and washer system is standard equip-
ment on this model. The rear wiper system provides
the following operating modes:
• Intermittent wipe with a five to eight second
delay between sweeps.
• Continuous fixed-cycle wipe.
• A park mode that operates the wiper motor until
the blade reaches its park position when the rear
wiper switch or ignition switch is placed in the Off
position, or when the liftgate or liftglass (if the vehi-
cle is so equipped) is opened.
• A rear washer mode that provides two or three
wiper blade sweeps before returning to the previously
selected rear wiper switch mode.
A single switch in the instrument panel inboard
switch pod controls both the rear wiper and washer
functions. The rear washer system shares the reser-
voir of the windshield washer system, but has its
own dedicated washer pump and plumbing.
The rear wiper and washer systems will operate
only when the ignition switch is in the Accessory or
On positions, and when the liftgate and/or optional
liftglass are closed. A fuse in the junction block pro-
tects the circuitry of both the rear wiper and washer
systems.
The rear wiper motor circuitry monitors the lift-
gate ajar switch and optional liftglass ajar switch cir-
cuits. Refer to Group 8Q - Vehicle Theft/Security
Systems for more information on the liftgate ajar and
liftglass ajar switch circuits. Refer to the owner's
manual for more information on the rear wiper and
washer system controls and operation.
WIPER ARM AND BLADE
All Grand Cherokee models have two 50.8-centime-
ter (20-inch) windshield wiper blades with replace-
able rubber elements (squeegees). The rear wiper
uses a single 30.48-centimeter (12-inch) wiper blade
with a replaceable rubber element (squeegee).
Caution should be exercised to protect the rubber
squeegees from any petroleum-based cleaners or con-
taminants, which will rapidly deteriorate the rubber.
If the squeegees are damaged, worn, or contami-
nated, they must be replaced.
Wiper squeegees exposed to the elements for a long
time tend to lose their wiping effectiveness. Periodic
cleaning of the squeegees is suggested to remove
deposits of salt and road film. The wiper blades,
arms, and windshield or rear glass should be cleaned
with a sponge or cloth and windshield washer fluid, a
mild detergent, or a non-abrasive cleaner. If the
squeegees continue to streak or smear, they should
be replaced.
The blades are mounted to spring-loaded wiper
arms. The spring tension of the wiper arms controls
the pressure applied to the blades on the glass. The
windshield wiper arms are secured by an integral
latch to the two wiper pivots on the cowl plenum cov-
er/grille panel at the base of the windshield. The rear
wiper arm is secured by a nut under the wiper arm
pivot-end cover directly to the rear wiper motor out-
put shaft on the liftgate panel.
The wiper arms and blades cannot be adjusted or
repaired. If faulty or damaged, they must be
replaced.
WIPER LINKAGE AND PIVOT
The wiper linkage and pivot module is secured
with screws to the cowl plenum panel beneath the
cowl plenum cover/grille panel. The wiper motor is
secured with screws to the center of the linkage and
pivot module bracket. The wiper pivots are secured
to the ends of the module bracket.
The two wiper pivot crank arms and the wiper
motor crank arm each have ball studs on their ends.
The motor crank arm ball stud is the longer of the
three. Two drive links connect the motor crank arm
to the pivot crank arms.
The passenger side drive link has a plastic socket-
type bushing on each end. The driver side drive link
has a plastic socket-type bushing on one end, and a
plastic sleeve-type bushing on the other end. The
socket-type bushing on one end of each drive link is
fit over the ball stud on the crank arm of its respec-
tive pivot. The driver side drive link sleeve-type
bushing end is then fit over the motor crank arm ball
stud, and the other socket-type bushing of the pas-
senger side drive link is snap-fit over the exposed
end of the motor crank arm ball stud.
The wiper linkage, pivots, bushings, and mounting
bracket are only serviced as a complete unit. If any
part of this assembly is faulty or damaged, the entire
wiper linkage and pivots module must be replaced.
The wiper motor and wiper motor crank arm are ser-
viced separately.
WIPER MOTOR
FRONT
The two-speed permanent magnet wiper motor has
an integral transmission and park switch. The motor
is secured to the wiper linkage and pivot module
bracket with three screws. The wiper motor output
shaft passes through a hole in the module bracket,
ZG