Washer System Diagnosis And Testing - Jeep Cherokee 2000 Service Manual

8K - 6 WIPER AND WASHER SYSTEMS
DIAGNOSIS AND TESTING (Continued)
be continuity. If OK, replace the faulty rear wiper
motor. If not OK, repair the open circuit as required.
WASHER SYSTEM
FRONT
The diagnosis found here addresses an inoperative
front washer pump. If the washer pump operates,
but no washer fluid is emitted from the washer noz-
zles, be certain to check the fluid level in the reser-
voir. Check for ice or other foreign material in the
reservoir, and for pinched, disconnected, broken, or
incorrectly routed washer system plumbing. For cir-
cuit descriptions and diagrams, refer to 8W-53 - Wip-
ers in Group 8W - Wiring Diagrams.
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, REFER TO
RESTRAINT SYSTEMS BEFORE ATTEMPTING ANY
STEERING WHEEL,
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) Turn the ignition switch to the On position.
Turn the wiper switch to the Low or High speed posi-
tion. Check whether the wipers operate. If OK, go to
Step 2. If not OK, see the Wiper System diagnosis in
this group.
(2) Turn the ignition switch to the Off position.
Disconnect and isolate the battery negative cable.
Unplug the front washer pump wire harness connec-
tor. Check for continuity between the ground circuit
cavity of the front washer pump wire harness connec-
tor and a good ground. There should be continuity. If
OK, go to Step 3. If not OK, repair the open circuit to
ground as required.
(3) Connect the battery negative cable. Turn the
ignition switch to the On position. Check for battery
voltage at the front washer switch output circuit cav-
ity of the front washer pump wire harness connector
while actuating the washer switch. If OK, replace the
faulty washer pump. If not OK, go to Step 4.
(4) Turn the ignition switch to the Off position.
Disconnect and isolate the battery negative cable.
Unplug the windshield wiper/washer switch wire
harness connector. Check for continuity between the
front washer switch output circuit cavity of the front
washer pump wire harness connector and a good
ground. There should be no continuity. If OK, go to
Step 5 If not OK, repair the short circuit as required.
(5) Check for continuity between the front washer
switch output circuit cavities of the front washer
pump wire harness connector and the wiper/washer
switch wire harness connector. There should be con-
GROUP 8M - PASSIVE
STEERING COLUMN,
tinuity. If OK, replace the faulty switch. If not OK,
repair the open circuit as required.
REAR
The diagnosis found here addresses an inoperative
rear washer pump. If the washer pump operates, but
no washer fluid is emitted from the washer nozzle, be
certain to check the fluid level in the reservoir. Check
for ice or other foreign material in the reservoir, and
for pinched, disconnected, broken, or incorrectly
routed washer system plumbing. For circuit descrip-
tions and diagrams, refer to 8W-53 - Wipers in Group
8W - Wiring Diagrams.
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, REFER
RESTRAINT SYSTEMS BEFORE ATTEMPTING ANY
STEERING WHEEL,
INSTRUMENT PANEL COMPONENT DIAGNOSIS OR
SERVICE. FAILURE TO TAKE THE PROPER PRE-
OR
CAUTIONS COULD RESULT IN ACCIDENTAL AIR-
BAG DEPLOYMENT AND POSSIBLE PERSONAL
INJURY.
(1) Turn the ignition switch to the On position.
Place the rear wiper/washer switch in the Wipe posi-
tion. Check whether the rear wiper is operating. If
OK, go to Step 2. If not OK, see the Wiper System
diagnosis in this group.
(2) Turn the ignition switch to the Off position.
Disconnect and isolate the battery negative cable.
Unplug the rear washer pump wire harness connec-
tor. Check for continuity between the ground circuit
cavity of the rear washer pump wire harness connec-
tor and a good ground. There should be continuity. If
OK, go to Step 3. If not OK, repair the open circuit to
ground as required.
(3) Connect the battery negative cable. Turn the
ignition switch to the On position. Check for battery
voltage at the rear washer motor control circuit cav-
ity of the rear washer pump wire harness connector
while the rear washer switch is actuated. If OK,
replace the faulty pump. If not OK, go to Step 4.
(4) Turn the ignition switch to the Off position.
Disconnect and isolate the battery negative cable.
Unplug the rear wiper/washer switch wire harness
connector. Check for continuity between the rear
washer motor control circuit cavity of the rear
washer pump wire harness connector and a good
ground. There should be no continuity. If OK, go to
Step 5. If not OK, repair the short circuit as
required.
(5) Check for continuity between the rear washer
motor control circuit cavities of the rear washer
pump wire harness connector and the rear wiper/
washer switch wire harness connector. There should
TO GROUP 8M -
STEERING COLUMN,
XJ
PASSIVE
OR