Jeep 1996 Grand Cherokee Service Manual - page 363
• 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 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 right
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.
These systems will operate only when the ignition
switch is in the Accessory or On positions, and when
the liftgate and/or liftglass (if equipped) are closed.
The rear wiper motor monitors the liftgate ajar and
liftglass ajar (if equipped) switch circuit. Refer to
Group 8Q - Vehicle Theft/Security Systems for more
information on the liftgate ajar and liftglass ajar
switches.
A fuse in the junction block protects the circuitry of
both the rear wiper and washer systems. Refer to the
owner’s manual for more information on the rear
wiper and washer system controls and operation.
WIPER ARMS AND BLADES
All Grand Cherokee models have two 20-inch wind-
shield wiper blades with replaceable rubber elements
(squeegees). The rear wiper uses a single 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 a mild detergent or non-
abrasive cleaner. If the squeegees continue to streak
or smear, they should be replaced.
The blades are mounted to spring-loaded wiper
arms. Spring tension of the wiper arms controls the
pressure applied to the blades on the glass. The
windshield wiper arms are attached by an integral
latch to the two wiper pivots on the cowl grille panel
at the base of the windshield. The rear wiper arm is
attached by a nut under the wiper arm pivot-end
cover directly to the rear wiper motor output shaft on
the liftgate panel. The wiper arms and blades cannot
be adjusted or repaired. If faulty, they must be
replaced.
WIPER LINKAGE AND PIVOTS
The wiper linkage and pivot module is fastened
with screws to the cowl plenum panel beneath the
cowl plenum cover/grille panel. The wiper motor is
fastened with screws to the center of the linkage and
pivot module bracket. The wiper pivots are fastened
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 right drive link has a
plastic socket-type bushing on each end. The left
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 respective pivot. The left drive link sleeve-type
bushing end is then fit over the motor crank arm ball
stud, and the other socket-type bushing of the right
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, the entire unit must
be replaced. The wiper motor and motor crank arm
are serviced separately.
WIPER MOTORS
FRONT
The two-speed permanent magnet wiper motor has
an integral transmission and park switch. The motor
is mounted to the wiper linkage and pivot module
bracket with three screws. The motor output shaft
passes through a hole in the module bracket, where a
nut secures the wiper motor crank arm to the motor
output shaft.
Wiper speed is controlled by current flow to the
appropriate set of brushes. The wiper motor com-
pletes its wipe cycle when the wiper/washer (multi-
function) switch is turned to the Off position, and
parks the blades in the lowest portion of the wipe
pattern. The wiper motor cannot be repaired. If
faulty, the entire wiper motor assembly must be
replaced. The motor crank arm and the linkage and
pivot module are available for service.
REAR
The rear wiper motor is mounted with two bolts
and nuts to a bracket on the liftgate inner panel,
below the rear glass and behind the liftgate trim.
The motor output shaft passes through the liftgate
outer panel where a gasket, bezel, and nut, seal and
8K - 2
WIPER AND WASHER SYSTEMS
ZJ
DESCRIPTION AND OPERATION (Continued)