Jeep 200 Cherokee, Service Manual

Page: 463 / 2119

WASHER PUMP
The washer pumps and motors are mounted near
the bottom of the washer reservoir. A barbed nipple
on the pump housing passes through a rubber grom-
met seal installed in a hole near the bottom of the
reservoir. The washer pump is retained by an inter-
ference fit between the barbed pump nipple and the
grommet seal, which is a light press fit.
A permanently lubricated and sealed motor is cou-
pled to a rotor-type pump. Washer fluid is gravity-fed
from the reservoir to the pump. When the motor is
energized, the pump pressurizes the washer fluid
and forces it through the plumbing to the nozzles.
On vehicles with the optional rear wiper/washer
system, the front washer pump and motor is always
mounted in the lower hole of the reservoir. The
washer pump and motor unit cannot be repaired. If
faulty, the entire washer pump and motor unit must
be replaced.
WASHER FLUID LEVEL SENSOR
The washer fluid level sensor is mounted near the
front of the washer reservoir, above the two washer
pumps. A barbed nipple on the sensor is press-fit into
a rubber grommet seal installed in a hole in the front
of the reservoir.
When the fluid level in the reservoir falls below
the pivoting float on the sensor, the float changes
position and closes the internal switch contacts of the
sensor. Refer to Group 8E - Instrument Panel Sys-
tems for diagnosis of the low washer fluid warning
lamp and circuit, including the sensor.
The washer fluid level sensor cannot be repaired. If
faulty or damaged, the sensor unit must be replaced.
WASHER NOZZLE AND PLUMBING
FRONT
Pressurized washer fluid is fed through a single
hose, attached to a barbed nipple on the front washer
pump. The hose is routed to a tee fitting located in
the cowl plenum area, beneath the cowl plenum cov-
er/grille panel. Hoses from the tee fitting are routed
to the two nozzles, which are riveted into openings in
the cowl plenum cover/grille panel below the wind-
shield.
The two fluidic washer nozzles are not adjustable.
The nozzles and hose fittings cannot be repaired and,
if faulty or damaged, they must be replaced.
REAR
Pressurized washer fluid is fed through a single
hose, attached to a barbed nipple on the rear washer
pump. The hose is routed from the front of the vehi-
cle to the liftgate with the body wire harness.
Located at the highest point of the supply hose
routing, beneath the liftgate opening upper header
garnish moulding, the hose connects to a check valve.
The check valve prevents washer fluid drain-back or
siphoning from occurring. From the check valve,
another single hose is routed through a grommet to
the liftgate, where it is connected to a nipple that
protrudes from the inside of the rear wiper motor
output shaft bezel.
The washer fluid passes through the bezel nipple
to the outside of the liftgate. There a single hose is
connected to a nipple on the outside of the rear wiper
motor output shaft bezel. The hose is routed through
a plastic trough-like guard snapped to the underside
of the rear wiper arm. The hose is then attached to
the single rear washer nozzle. The nozzle snaps into
place on the rear wiper arm.
The rear washer nozzle cannot be adjusted. The
nozzle, bezel, check valve, and hose fittings cannot be
repaired and, if faulty or damaged, they must be
replaced.
DIAGNOSIS AND TESTING
WIPER SYSTEM
FRONT
For circuit descriptions and diagrams, refer to
8W-53 - Wipers in Group 8W - Wiring Diagrams.
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS,
REFER TO GROUP 8M - PASSIVE
RESTRAINT SYSTEMS BEFORE ATTEMPTING ANY
STEERING
WHEEL, STEERING COLUMN, OR
INSTRUMENT PANEL COMPONENT DIAGNOSIS OR
SERVICE. FAILURE TO TAKE THE PROPER PRE-
CAUTIONS COULD RESULT IN ACCIDENTAL AIR-
BAG DEPLOYMENT AND POSSIBLE PERSONAL
INJURY.
(1) Check the circuit breaker in the junction block.
If OK, go to Step 2. If not OK, replace the faulty cir-
cuit breaker.
(2) Disconnect and isolate the battery negative
cable. Unplug the windshield wiper switch wire har-
ness connector. Connect the battery negative cable.
Turn the ignition switch to the On position. Check
for battery voltage at the fused ignition switch out-
put (run/acc) circuit cavity of the wiper switch wire
harness connector. If OK, go to Step 3. If not OK,
repair the open circuit to the junction block as
required.
(3) If the problem being diagnosed involves only
the pulse wipe, wipe-after-wash, or intermittent wipe
modes, go to Step 4. If not, go to Step 5.
8K - 4 WIPER AND WASHER SYSTEMS
XJ
DESCRIPTION AND OPERATION (Continued)