LATCH JEEP GRAND CHEROKEE 2003 WJ / 2.G Service Manual

Washer hose is available for service only as roll
stock, which must then be cut to length. The molded
plastic washer hose fittings cannot be repaired. If
these fittings are faulty or damaged, they must be
replaced.
OPERATION
Washer fluid in the washer reservoir is pressurized
and fed by the front washer pump/motor through the
front washer system plumbing and fittings to the two
front washer nozzles. Whenever routing the washer
hose or a wire harness containing a washer hose, it
must be routed away from hot, sharp, or moving
parts; and, sharp bends that might pinch the hose
must be avoided.
FRONT WASHER NOZZLE
DESCRIPTION
The two front washer nozzles have integral snap
features that secure them in dedicated holes in the
cowl plenum cover/grille panel located near the base
of the windshield. The domed upper surface of the
washer nozzle is visible on the top of the plenum cov-
er/grille panel, and the nozzle orifice is oriented
towards the windshield glass. The washer plumbing
fittings for the washer nozzles are concealed beneath
the cowl plenum cover/grille panel. These fluidic
washer nozzles are constructed of molded plastic. The
cowl plenum cover/grille panel must be removed from
the vehicle to access the nozzles for service. The
washer nozzles cannot be adjusted or repaired. If
faulty or damaged, they must be replaced.
OPERATION
The two front washer nozzles are designed to dis-
pense washer fluid into the wiper pattern area on the
outside of the windshield glass. Pressurized washer
fluid is fed to each nozzle from the washer reservoir
by the front washer pump/motor through a single
hose, which is attached to a barbed nipple on each
front washer nozzle below the cowl plenum cover/
grille panel. The washer nozzles incorporate a fluidic
design, which causes the nozzle to emit the pressur-
ized washer fluid as an oscillating stream to more
effectively cover a larger area of the glass area to be
cleaned.
REMOVAL
(1) Disconnect and isolate the battery negative
cable.
(2) Remove the wiper arms from the wiper pivots.
(Refer to 8 - ELECTRICAL/FRONT WIPERS/WASH-
ERS/FRONT WIPER ARMS - REMOVAL).
(3) Unlatch and open the hood.(4) Pull the hood to plenum seal off of the forward
flanges of the cowl grille cover and the plenum panel.
(5) Remove the six plastic nuts (2 short and 4
long) that secure the cowl grille cover to the studs on
the cowl top panel near the base of the windshield
(Fig. 4).
(6) Lift the left end of the cowl grille cover off of
the cowl plenum panel far enough to access the front
washer plumbing.
(7) Disconnect the engine compartment washer
hose from the cowl grille cover washer hose at the
plastic elbow connector.
(8) Remove the cowl grille cover from the cowl ple-
num and cowl top panels through the opening
between the hood and the base of the windshield.
(9) From the underside of the cowl grille cover, dis-
connect the washer hose(s) from the barbed nipple(s)
of the front washer nozzle(s).
(10) From the underside of the cowl grille cover,
release the integral snap features of the front washer
nozzle(s) and push the nozzle(s) out through the
mounting hole toward the top side of the cowl grille
cover.
INSTALLATION
(1) From the top side of the cowl grille cover,
insert the nipple end of the front washer nozzle(s)
through the mounting hole in the cowl grille cover.
(2) Push firmly and evenly on the top of the front
washer nozzle until the integral snap features lock
into place on the underside of the cowl grille cover.
(3) From the underside of the cowl grille cover,
reconnect the washer hose(s) to the barbed nipple(s)
of the front washer nozzle(s).
Fig. 4 Cowl Grille Cover Remove/Install
1 - WASHER HOSE CONNECTION
2 - STUDS (6)
3 - COWL GRILLE COVER
4 - PLASTIC NUT (6)
WJFRONT WIPERS/WASHERS 8R - 11
FRONT WASHER HOSES/TUBES (Continued)

(4) Reinstall the washer hoses for the front washer
nozzle(s) into their routing clips on the underside of
the cowl grille cover.
(5) Position the cowl grille cover onto the cowl ple-
num and cowl top panels through the opening
between the hood and the base of the windshield
(Fig. 4).
(6) Lift the left end of the cowl grille cover off of
the cowl plenum panel far enough to access the front
washer plumbing.
(7) Reconnect the cowl grille cover washer hose to
the engine compartment washer hose at the elbow
connector.
(8) Install the six plastic nuts that secure the cowl
grille cover to the studs on the cowl top panel near
the base of the windshield. These nuts are to be
installed by pushing them onto the studs in the fol-
lowing sequence:
(a) First, install the short nuts to the third stud
from the right, then the second stud from the left.
(b) Next, install the long nuts to the right out-
board stud, then the left outboard stud.
(c) Finally, install the two remaining long nuts
to the third stud from the left, then the second
stud from the right.
(9) Starting at the ends and working toward the
center, push the hood to plenum seal onto the for-
ward flanges of the cowl grille cover and the plenum
panel.
(10) Close and latch the hood.
(11) Reinstall the wiper arms onto the wiper piv-
ots. (Refer to 8 - ELECTRICAL/FRONT WIPERS/
WASHERS/FRONT WIPER ARMS -
INSTALLATION).
(12) Reconnect the battery negative cable.
FRONT WASHER PUMP/
MOTOR
DESCRIPTION
The front washer pump/motor unit is located on
the outboard side and near the front of the washer
reservoir, between the left front inner and outer
fender panels (Fig. 5). A small permanently lubri-
cated and sealed electric motor is coupled to the
rotor-type washer pump. A seal flange with a large
barbed inlet nipple on the pump housing passes
through a rubber grommet seal installed in one of
two dedicated mounting holes near the bottom of the
washer reservoir. The front washer pump/motor unit
is always mounted in the lower pump mounting hole
of the reservoir. A smaller barbed outlet nipple on the
pump housing connects the unit to the front washer
hose. The washer pump/motor unit is retained on the
reservoir by the interference fit between the barbedpump inlet nipple and the grommet seal, which is a
light press fit. An integral electrical connector recep-
tacle is located on the top of the motor housing. The
front washer pump/motor unit cannot be repaired. If
faulty or damaged, the entire washer pump/motor
unit must be replaced.
OPERATION
The front washer pump/motor unit is connected to
the vehicle electrical system through a single take
out and two-cavity connector of the left headlamp
and dash wire harness. The washer pump/motor is
grounded at all times through a take out of the left
headlamp and dash wire harness with a single eyelet
terminal connector that is secured under a ground
screw to the top of the left inner fender shield in the
engine compartment. The front washer pump/motor
receives battery current on a fused ignition switch
output (run-acc) circuit through the closed contacts of
the momentary front washer switch within the right
multi-function switch only when the switch control
stalk is pulled towards the steering wheel. Washer
fluid is gravity-fed from the washer reservoir to the
inlet side of the washer pump. When the pump motor
is energized, the rotor-type pump pressurizes the
washer fluid and forces it through the pump outlet
nipple, the front washer plumbing, and the front
washer nozzles onto the windshield glass.
REMOVAL
(1) Disconnect and isolate the battery negative
cable.
Fig. 5 Washer Pumps (Viewed from Bottom of
Reservoir)
1 - REAR WASHER PUMP/MOTOR
2 - FRONT WASHER PUMP/MOTOR
3 - WASHER FLUID LEVEL SWITCH
8R - 12 FRONT WIPERS/WASHERSWJ
FRONT WASHER NOZZLE (Continued)

connection. The mounting nut locks the wiper arm to
the threaded stud on the wiper pivot. The spring-
loaded wiper arm hinge controls the down-force
applied through the tip of the wiper arm to the wiper
blade on the glass. The hook formation on the tip of
the wiper arm provides a cradle for securing and
latching the wiper blade pivot block to the wiper
arm.
REMOVAL
(1) Lift the front wiper arm to its over-center posi-
tion to hold the wiper blade off of the glass and
relieve the spring tension on the wiper arm to wiper
pivot connection.
(2) Carefully pry the plastic nut cap off of the
pivot end of the wiper arm (Fig. 7).
(3) Remove the nut that secures the wiper arm to
the wiper pivot shaft.
(4) Use a suitable battery terminal puller to disen-
gage the wiper arm from the wiper pivot shaft
splines (Fig. 8).
(5) Remove the front wiper arm pivot end from the
wiper pivot.
INSTALLATION
NOTE: Be certain that the wiper motor is in the park
position before attempting to install the wiper arms.
Turn the ignition switch to the On position and
move the right multi-function switch control knob to
its Off position. If the wiper pivots move, wait until
they stop moving, then turn the ignition switchback to the Off position. The wiper motor is now in
its park position.
(1) The front wiper arms must be indexed to the
wiper pivots with the wiper motor in the park posi-
tion to be properly installed. Position the front wiper
arm pivot ends onto the wiper pivots so that the
lower edge of the blade is aligned with the wiper
alignment lines located in the lower edge of the
windshield glass (Fig. 7).
(2) Once the wiper blade is aligned, lift the wiper
arm away from the windshield slightly to relieve the
spring tension on the pivot end and push the pivot
hole on the end of the wiper arm down over the
wiper pivot shaft.
(3) Install and tighten the nut that secures the
wiper arm to the wiper pivot shaft. Tighten the nut
to 23.7 N´m (210 in. lbs.).
(4) Wet the windshield glass, then operate the
front wipers. Turn the wiper switch to the Off posi-
tion, then check for the correct wiper arm position
and readjust as required.
(5) Reinstall the plastic nut cap onto the wiper
arm pivot nut.
FRONT WIPER BLADE
DESCRIPTION
Each front wiper blade is secured by an integral
latching pivot block to the hook formation on the tip
of the front wiper arms, and rests on the glass near
the base of the windshield when the wipers are not
in operation (Fig. 9). The wiper blade consists of the
following components:
²Superstructure- The superstructure includes
several stamped steel bridges and links with claw
Fig. 7 Wiper Arm Remove/Install
1 - ARM AND BLADE
2 - CAP
3 - NUT
4 - PIVOT SHAFT
5 - ALIGNMENT LINE
Fig. 8 Wiper Arm Puller - Typical
1 - WIPER ARM
2 - WIPER PIVOT
3 - BATTERY TERMINAL PULLER
8R - 14 FRONT WIPERS/WASHERSWJ
FRONT WIPER ARM (Continued)

formations that grip the wiper blade element. Also
included in this unit is the latching, molded plastic
pivot block that secures the superstructure to the
wiper arm. All of the metal components of the wiper
blade have a satin black finish applied.
²Element- The wiper element or squeegee is the
resilient rubber member of the wiper blade that con-
tacts the glass.
²Flexor- The flexor is a rigid metal component
running along the length of each side of the wiper
element where it is gripped by the claws of the
superstructure.
All Grand Cherokee models have two 52.50 centi-
meter (20.67 inch) long windshield wiper blades with
non-replaceable rubber elements (squeegees). The
wiper blades cannot be adjusted or repaired. If faulty,
worn, or damaged the entire wiper blade unit must
be replaced.
OPERATION
The wiper blades are moved back and forth across
the glass by the wiper arms when the wipers are
being operated. The wiper blade superstructure is
the flexible frame that grips the wiper blade element
and evenly distributes the force of the spring-loaded
wiper arm along the length of the element. The com-
bination of the wiper arm force and the flexibility of
the superstructure makes the element conform to
and maintain proper contact with the glass, even as
the blade is moved over the varied curvature found
across the glass surface. The wiper element flexor
provides the claws of the blade superstructure with a
rigid, yet flexible component on the element which
can be gripped. The rubber element is designed to be
stiff enough to maintain an even cleaning edge as it
is drawn across the glass, but resilient enough to
conform to the glass surface and flip from one clean-
ing edge to the other each time the wiper blade
changes directions.
REMOVAL
NOTE: The notched retainer end of the wiper ele-
ment should always be oriented towards the end of
the wiper blade that is nearest to the wiper pivot.
(1) Lift the front wiper arm to raise the wiper
blade and element off of the glass, until the wiper
arm hinge is in its over-center position.
(2) To remove the wiper blade from the wiper arm,
push the pivot block latch release tab under the tip
of the arm and slide the blade away from the tip
towards the pivot end of the arm far enough to dis-
engage the pivot block from the hook (Fig. 10).
(3) Extract the hook formation on the tip of the
wiper arm from the opening in the wiper blade
superstructure ahead of the wiper blade pivot block/
latch unit.
CAUTION: Do not allow the wiper arm to spring
back against the glass without the wiper blade in
place or the glass may be damaged.
(4) Gently lower the wiper arm tip onto the glass.
INSTALLATION
NOTE: The notched retainer end of the wiper ele-
ment should always be oriented towards the end of
the wiper blade that is nearest to the wiper pivot.
(1) Lift the front wiper arm off of the windshield
glass, until the wiper arm hinge is in its over-center
position.
(2) Position the front wiper blade near the hook
formation on the tip of the arm with the notched
retainer for the wiper element oriented towards the
end of the wiper arm that is nearest to the wiper
pivot.
Fig. 9 Wiper Blade - Typical
1 - RELEASE TAB
Fig. 10 Wiper Blade Remove/Install - Typical
1 - RELEASE TAB
WJFRONT WIPERS/WASHERS 8R - 15
FRONT WIPER BLADE (Continued)

(3) Insert the hook formation on the tip of the
wiper arm through the opening in the wiper blade
superstructure ahead of the wiper blade pivot block/
latch unit far enough to engage the pivot block with
the hook (Fig. 10).
(4) Slide the wiper blade pivot block/latch up into
the hook formation on the tip of the wiper arm until
the latch release tab snaps into its locked position.
Latch engagement will be accompanied by an audible
click.
(5) Gently lower the wiper blade onto the glass.
FRONT WIPER MODULE
DESCRIPTION
The front wiper module is secured with four screws
through rubber isolators to the cowl plenum panel
beneath the cowl plenum cover/grille panel (Fig. 11).
The ends of the wiper pivot shafts that protrude
through dedicated openings in the cowl plenum cov-
er/grille panel to drive the wiper arms and blades are
the only visible components of the front wiper mod-
ule. The front wiper module consists of the following
major components:
²Bracket- The front wiper module bracket con-
sists of a long tubular steel main member that has a
stamped pivot bracket formation near each end
where the two wiper pivots are secured. A stamped
steel mounting plate for the wiper motor is secured
with welds near the center of the main member.
²Crank Arm- The front wiper motor crank arm
is a stamped steel unit with a slotted hole on the
driven end that is secured to the wiper motor outputshaft with a nut, and a ball stud secured to the drive
end.
²Linkage- Two stamped steel drive links con-
nect the wiper motor crank arm to the pivot lever
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 snap-fit over the ball stud on the lever
arm of its respective 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 bush-
ing of the passenger side drive link is snap-fit over
the exposed end of the wiper motor crank arm ball
stud.
²Motor- The front wiper motor is secured with
three screws to the motor mounting plate near the
center of the wiper module bracket. The wiper 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. The two-speed perma-
nent magnet wiper motor features an integral trans-
mission, an internal park switch, and an internal
automatic resetting circuit breaker.
²Pivots- The two front wiper pivots are secured
to the ends of the wiper module bracket. The crank
arms that extend from the bottom of the pivot shafts
each have a ball stud on their end. The upper end of
each pivot shaft where the wiper arms will be fas-
tened each has an externally serrated drum with a
threaded stud secured to it.
The front wiper module cannot be adjusted or
repaired. If any component of the module is faulty or
damaged, the entire front wiper module unit must be
replaced. The reinforcement bracket and stud plate
are available for service replacement.OPERATION
The front wiper module operation is controlled by
the battery current inputs received by the wiper
motor from the wiper on/off and wiper high/low
relays. The wiper motor speed is controlled by cur-
rent flow to either the low speed or the high speed
set of brushes. The park switch is a single pole, sin-
gle throw, momentary switch within the wiper motor
that is mechanically actuated by the wiper motor
transmission components. The park switch alter-
nately closes the wiper park switch sense circuit to
ground or to battery current, depending upon the
position of the wipers on the glass. This feature
allows the motor to complete its current wipe cycle
after the wiper system has been turned Off, and to
park the wiper blades in the lowest portion of the
wipe pattern. The automatic resetting circuit breaker
protects the motor from overloads. The wiper motor
Fig. 11 Front Wiper Module
1 - FRONT WIPER MODULE
2 - SCREW (4)
3 - WIRE HARNESS CONNECTOR
4 - LOWER COWL PLENUM PANEL
8R - 16 FRONT WIPERS/WASHERSWJ
FRONT WIPER BLADE (Continued)

crank arm, the two wiper linkage members, and the
two wiper pivots mechanically convert the rotary out-
put of the wiper motor to the back and forth wiping
motion of the wiper arms and blades on the glass.
REMOVAL
(1) Disconnect and isolate the battery negative
cable.
(2) Remove the front wiper arms from the wiper
pivots. (Refer to 8 - ELECTRICAL/FRONT WIPERS/
WASHERS/FRONT WIPER ARMS - REMOVAL).
(3) Unlatch and open the hood.
(4) Remove the hood to plenum seal from the for-
ward flanges of the cowl grille cover and the plenum
panel.
(5) Remove the six plastic nuts (2 short and 4
long) that secure the cowl grille cover to the studs on
the cowl top panel near the base of the windshield
(Fig. 12).
(6) Lift the left end of the cowl grille cover off of
the cowl plenum panel far enough to access the front
washer plumbing.
(7) Disconnect the front washer engine compart-
ment hose from the cowl grille cover hose at the
elbow connector.
(8) Remove the cowl grille cover from the cowl ple-
num and cowl top panels through the opening
between the hood and the base of the windshield.
(9) Remove the four screws that secure the front
wiper module to the cowl plenum panel (Fig. 13).
(10) Lift the left end of the front wiper module far
enough to access the front wiper motor wire harness
connector.(11) Disconnect the left headlamp and dash wire
harness connector for the front wiper motor from the
front wiper motor pigtail wire connector.
(12) Remove the front wiper module from the cowl
plenum as a unit.
INSTALLATION
(1) Position the front wiper module into the cowl
plenum as a unit (Fig. 13).
(2) Lift the left end of the front wiper module far
enough to access the front wiper motor wire harness
connector.
(3) Reconnect the left headlamp and dash wire
harness connector for the front wiper motor to the
front wiper motor pigtail wire connector.
(4) Loosely install one of the front wiper module
mounting screws to the mounting hole near the pivot
on the right end of the module to locate the module
in the plenum.
(5) Working from left to right, install and tighten
the four screws that secure the front wiper module to
the cowl plenum panel. Tighten the screws to 8 N´m
(72 in. lbs.).
(6) Position the cowl grille cover onto the cowl ple-
num and cowl top panels through the opening
between the hood and the base of the windshield
(Fig. 12).
(7) Lift the left end of the cowl grille cover off of
the cowl plenum panel far enough to access the front
washer plumbing.
(8) Reconnect the front washer system engine com-
partment hose to the cowl grille cover hose at the
elbow connector.
Fig. 12 Cowl Grille Cover Remove/Install
1 - WASHER HOSE CONNECTION
2 - STUDS (6)
3 - COWL GRILLE COVER
4 - PLASTIC NUT (6)
Fig. 13 Front Wiper Module Remove/Install
1 - FRONT WIPER MODULE
2 - SCREW (4)
3 - WIRE HARNESS CONNECTOR
4 - LOWER COWL PLENUM PANEL
WJFRONT WIPERS/WASHERS 8R - 17
FRONT WIPER MODULE (Continued)

(9) Install the six plastic nuts that secure the cowl
grille cover to the studs on the cowl top panel near
the base of the windshield. These nuts are to be
installed by pushing them onto the studs in the fol-
lowing sequence:
(a) First, install the short nuts to the third stud
from the right, then the second stud from the left.
(b) Next, install long nuts to the right outboard
stud, then the left outboard stud.
(c) Finally, install the two remaining long nuts
to the third stud from the left, then the second
stud from the right.
(10) Starting at the ends and working toward the
center, push the hood to plenum seal onto the for-
ward flanges of the cowl grille cover and the plenum
panel.
(11) Close and latch the hood.
(12) Reinstall the wiper arms onto the wiper piv-
ots. (Refer to 8 - ELECTRICAL/FRONT WIPERS/
WASHERS/FRONT WIPER ARMS -
INSTALLATION).
(13) Reconnect the battery negative cable.
RAIN SENSOR MODULE
DESCRIPTION
The Rain Sensor Module (RSM) is the primary
component of the automatic wiper system (Fig. 14).
The RSM is located on the inside of the windshield,
between the rear view mirror mounting button and
the windshield header and is concealed behind a
molded plastic trim cover that snaps over the modulehousing. The triangular-shaped molded black plastic
housing of the RSM has a rectangular opening
located on the upper end of the housing for the mod-
ule connector receptacle, which contains four termi-
nal pins. These terminal pins connect the rain sensor
to the vehicle electrical system through a dedicated
take out and connector of the overhead wire harness
that extends from above the headliner. Five openings
on the windshield side of the RSM housing are fitted
with eight convex clear plastic lenses. A metal spring
clip on each side of the housing near the bottom
secures the RSM to a plastic mounting bracket that
is bonded to the windshield glass. Concealed within
the RSM housing is the electronic circuitry of the
module, which includes four InfraRed (IR) diodes,
two photocells, and a microprocessor.
The RSM software is Flash compatible, which
means it can be reprogrammed using Flash repro-
gramming procedures. However, if any of the hard-
ware of the RSM is damaged or faulty, the entire
module must be replaced. The RSM bracket is ser-
viced as a unit with the windshield glass. If the
bracket is faulty, damaged, or separated from the
windshield glass, the windshield unit must be
replaced.
OPERATION
The microprocessor-based Rain Sensor Module
(RSM) senses moisture in the wipe pattern on the
outside of the windshield glass and sends wipe com-
mands to the Body Control Module (BCM). Four
InfraRed (IR) diodes within the RSM generate IR
light beams that are aimed by four of the convex
optical lenses near the base of the module through
the windshield glass. Four additional convex optical
lenses near the top of the RSM are focused on the IR
light beams on the outside of the windshield glass
and allow the two photocells within the module to
sense changes in the intensity of these IR light
beams. When sufficient moisture accumulates within
the wipe pattern of the windshield glass, the RSM
detects a change in the monitored IR light beam
intensity.
The internal programming of the RSM then sends
the appropriate electronic wipe command messages
to the BCM over the Programmable Communications
Interface (PCI) data bus. The BCM responds by acti-
vating or deactivating the front wiper system. The
BCM also sends electronic sensitivity level messages
to the RSM over the PCI data bus based upon the
driver-selected sensitivity setting of the control knob
on the control stalk of the right (wiper) multi-func-
tion switch. The higher the selected sensitivity set-
ting the more sensitive the RSM is to the
accumulated moisture on the windshield glass, and
Fig. 14 Rain Sensor Module
1 - SPRING CLIP (2)
2 - INFRARED LENS (4)
3 - HOUSING
4 - CONNECTOR RECEPTACLE
5 - PHOTOCELL LENS (4)
8R - 18 FRONT WIPERS/WASHERSWJ
FRONT WIPER MODULE (Continued)

secured loosely to and pivots on the wiper arm hinge
pin to conceal the wiper arm retaining nut. The wide
end of a tapered, stamped steel channel is secured
with a hinge pin to the pivot end of the wiper arm.
One end of a long, rigid, stamped steel strap, with a
small hole near its pivot end, is riveted and crimped
within the narrow end of the stamped steel channel.
The tip of the wiper blade end of this strap is bent
back under itself to form a small hook. Concealed
within the stamped steel channel, one end of a long
spring is engaged with a wire hook on the underside
of the die cast pivot end, while the other end of the
spring is hooked through the small hole in the steel
strap. A molded plastic wiper arm support is snapped
onto the wiper arm strap where it exits the channel.
The entire wiper arm has a satin black finish applied
to all of its visible surfaces.
A wiper arm cannot be adjusted or repaired. If
damaged or faulty, the entire wiper arm unit must be
replaced.
OPERATION
The rear wiper arm is designed to mechanically
transmit the motion from the rear wiper motor out-
put shaft to the rear wiper blade. The wiper arm
must be properly indexed to the motor output shaft
in order to maintain the proper wiper blade travel on
the glass. The wiper arm support is designed to lift
and support the rear wiper arm and blade off of the
glass when the rear wiper blade is parked. This sup-
port and the park ramp on the liftgate outer panel
below the glass also provide an alignment reference
to ensure accurate rear wiper arm and blade instal-
lation. The hole with internal serrations in the wiper
arm pivot end interlocks with the serrations on the
outer circumference of the motor output shaft, allow-
ing positive engagement and finite adjustment of this
connection. A hex nut secures the wiper arm pivot
end to the threads on the motor output shaft and the
pivot cover hinges and snaps over this connection for
a neat appearance. The spring-loaded wiper arm
hinge controls the down-force applied through the tip
of the wiper arm to the wiper blade on the glass. The
hook formation on the tip of the wiper arm provides
a cradle for securing and latching the wiper blade
pivot block to the wiper arm.
REMOVAL
(1) Lift the rear wiper arm pivot cover by lifting it
at the rear wiper motor output shaft end of the arm
(Fig. 8).
(2) Remove the nut that secures the rear wiper
arm to the rear wiper motor output shaft.
(3) Lift the rear wiper arm far enough to engage
the over-center arm hinge in its upright position to
hold the wiper blade off of the liftgate.(4) Use a battery terminal puller to disengage the
wiper arm from the rear wiper motor output shaft
splines (Fig. 9).
(5) Remove the rear wiper arm pivot end from the
motor output shaft.
INSTALLATION
NOTE: Always install the wiper arm and blade with
the wiper motor in the Park position.
Fig. 8 Rear Wiper Arm Remove/Install
1 - LIFTGATE
2 - REAR WIPER MOTOR OUTPUT SHAFT
3 - PARK RAMP
4 - PIVOT COVER
5 - REAR WIPER ARM
6 - NUT
Fig. 9 Wiper Arm Puller - Typical
1 - WIPER ARM
2 - WIPER PIVOT
3 - BATTERY TERMINAL PULLER
8R - 42 REAR WIPERS/WASHERSWJ
REAR WIPER ARM (Continued)

(1) The rear wiper arm must be indexed to the
motor output shaft with the rear wiper motor in the
park position to be properly installed. Place the
wiper arm onto the liftgate with the wiper arm sup-
port positioned on the park ramp and the pivot hole
on the end of the arm positioned over the rear wiper
motor output shaft.
(2) Position the ridge of the wiper arm support on
the liftgate park ramp in the Installation Position
(Fig. 10).
(3) With the wiper arm in the Installation Posi-
tion, push the pivot hole on the end of the wiper arm
down over the rear wiper motor output shaft.
(4) Install and tighten the nut that secures the
rear wiper arm to the rear wiper motor output shaft.
Tighten the nut to 18 N´m (160 in. lbs.).
(5) Close the rear wiper arm pivot cover.(6) Lift the rear wiper arm support away from the
park ramp, then place the wiper arm support in the
park ramp in the Park Position (Fig. 10).
REAR WIPER BLADE
DESCRIPTION
The rear wiper blade is secured by an integral
latching pivot block to the hook formation on the tip
of the rear wiper arm, and rests off the glass near
the base of the liftgate glass opening when the wiper
is not in operation. The wiper blade consists of the
following components:
²Superstructure- The superstructure includes
a stamped steel bridge and plastic links with claw
formations that grip the wiper blade element. Also
included in this unit is the latching, molded plastic
pivot block that secures the superstructure to the
wiper arm. All of the metal components of the wiper
blade have a satin black finish applied.
²Element- The wiper element or squeegee is the
resilient rubber member of the wiper blade that con-
tacts the glass.
²Flexor- The flexor is a rigid metal component
running along the length of each side of the wiper
element where it is gripped by the claws of the
superstructure.
All Grand Cherokee models have a single 31.00
centimeter (12.20 inch) rear wiper blade with a non-
replaceable rubber element (squeegee). The wiper
blade cannot be adjusted or repaired. If faulty, worn,
or damaged the entire wiper blade unit must be
replaced.
OPERATION
The wiper blade is moved back and forth across the
glass by the wiper arm when the wiper system is in
operation. The wiper blade superstructure is the flex-
ible frame that grips the wiper blade element and
evenly distributes the force of the spring-loaded
wiper arm along the length of the element. The com-
bination of the wiper arm force and the flexibility of
the superstructure makes the element conform to
and maintain proper contact with the glass, even as
the blade is moved over the varied curvature found
across the glass surface. The wiper element flexor
provides the claws of the blade superstructure with a
rigid, yet flexible component on the element which
can be gripped. The rubber element is designed to be
stiff enough to maintain an even cleaning edge as it
is drawn across the glass, but resilient enough to
conform to the glass surface and flip from one clean-
ing edge to the other each time the wiper blade
changes directions.
Fig. 10 Rear Wiper Arm Installation
1 - LIFTGATE
2 - PARK RAMP
3 - REAR WIPER ARM
4 - INSTALLATION POSITION
5 - REAR WIPER ARM AND BLADE
6 - PARK POSITION
7 - PARK RAMP
8 - LIFTGATE
WJREAR WIPERS/WASHERS 8R - 43
REAR WIPER ARM (Continued)

REMOVAL
NOTE: The notched retainer end of the wiper ele-
ment should always be oriented towards the end of
the wiper blade that is nearest to the wiper motor
output shaft.
(1) Disengage the rear wiper arm support from the
rubber rear wiper arm park ramp on the right side of
the liftgate just below the liftgate glass.
(2) Lift the rear wiper arm to engage the arm
hinge in its over-center position with the wiper blade
and element off of the liftgate and the glass.
(3) To remove the wiper blade from the wiper arm,
push the pivot block latch release tab under the tip
of the arm and slide the blade away from the tip
towards the pivot end of the arm far enough to dis-
engage the pivot block from the hook (Fig. 11).
(4) Extract the hook formation on the tip of the
wiper arm from the opening in the wiper blade
superstructure ahead of the wiper blade pivot block/
latch unit.
CAUTION: Do not allow the wiper arm to spring
back against the liftgate or the glass without the
wiper blade in place or they may be damaged.
(5) Gently lower the wiper arm and place the arm
support in the park ramp.
INSTALLATION
NOTE: The notched retainer end of the wiper ele-
ment should always be oriented towards the end of
the wiper blade that is nearest to the wiper motor
output shaft.
(1) Lift the rear wiper arm off of the liftgate park
ramp.
(2) Position the rear wiper blade near the hook for-
mation on the tip of the arm with the notched
retainer for the wiper element oriented towards theend of the wiper arm that is nearest to the wiper
motor output shaft.
(3) Insert the hook formation on the tip of the
wiper arm through the opening in the wiper blade
superstructure ahead of the wiper blade pivot block/
latch unit far enough to engage the pivot block with
the hook (Fig. 11).
(4) Slide the wiper blade pivot block/latch up into
the hook formation on the tip of the wiper arm until
the latch release tab snaps into its locked position.
(5) Gently lower the wiper arm and place the arm
support in the park ramp.
REAR WIPER MODULE
DESCRIPTION
The rear wiper module is concealed within the lift-
gate, below the liftgate glass and behind the liftgate
trim panel (Fig. 12). The end of the motor output
shaft that protrudes through the liftgate outer panel
to drive the rear wiper arm and blade is the only vis-
ible component of the rear wiper module. A rubber
gasket, a bezel, and a nut seal and secure the motor
output shaft to the liftgate outer panel. A molded
plastic nut cover snaps onto the bezel to conceal the
nut and improve appearance. The rear wiper module
consists of the following major components:
²Bracket- The rear wiper module bracket con-
sists of a stamped steel mounting plate for the wiper
Fig. 11 Wiper Blade Remove/Install - Typical
1 - PIVOT BLOCK LATCH RELEASE TAB
Fig. 12 Rear Wiper Module
1 - KEYED SLOTS
2 - LIFTGATE WIRE HARNESS CONNECTOR
3 - REAR WIPER MODULE
4 - NUT (2)
5 - LIFTGATE INNER PANEL
8R - 44 REAR WIPERS/WASHERSWJ
REAR WIPER BLADE (Continued)