Washer System - Jeep 1997 Grand Cherokee Service Manual

8K - 6 WIPER AND WASHER SYSTEMS
DIAGNOSIS AND TESTING (Continued)
(d) Check for battery voltage at the wiper park
switch sense circuit cavity of the wiper motor wire
harness connector with the wiper switch in the
Low or High position, then move the switch to the
Off position. The meter should switch between bat-
tery voltage and zero volts while the wipers are
cycling. The meter should read battery voltage
when the switch is moved to the Off position until
the wipers park, and then read a steady zero volts.
If not OK, replace the faulty wiper motor.
REAR
For circuit descriptions and diagrams, refer to
8W-53 - Wipers 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) Check the fuse in the junction block. If OK, go
to Step 2. If not OK, repair the shorted circuit or
component as required and replace the faulty fuse.
(2) Turn the ignition switch to the On position.
Check for battery voltage at the fused ignition switch
output circuit cavity of the rear wiper switch wire
harness connector. If OK, go to Step 3. If not OK,
repair the open circuit as required.
(3) Turn the ignition switch to the Off position.
Disconnect and isolate the battery negative cable.
Remove and test the rear wiper switch, as described
in this group. If OK, go to Step 4. If not OK, replace
the faulty switch.
(4) Remove the liftgate inner trim panel. Measure
the resistance between the ground circuit cavity of
the rear wiper motor wire harness connector and a
good ground. The meter should read zero ohms. If
OK, go to Step 5. If not OK, repair the circuit to
ground as required.
(5) Check for continuity between the liftgate ajar
switch sense cavity of the rear wiper motor wire har-
ness connector and a good ground. There should be
continuity with liftgate and/or liftglass (if the vehicle
is so equipped) open, and no continuity with the lift-
gate and liftglass (if the vehicle is so equipped)
closed. If OK, go to Step 6. If not OK, repair the lift-
gate and/or liftglass ajar circuit or switch as
required.
(6) Plug in the rear wiper switch wire harness con-
nector. Connect the battery negative cable. Turn the
ignition switch to the On position. Place the rear
wiper switch in the Wipe position. Check for battery
GROUP 8M - PASSIVE
STEERING COLUMN,
voltage at the rear wiper motor control circuit cavity
of the rear wiper motor wire harness connector.
Repeat the test for the rear wiper motor control
(intermittent) circuit cavity with the rear wiper
switch in the Intermittent position, then at the rear
washer motor control circuit cavity with the rear
wiper switch in the Wash position. In each case, the
meter should read battery voltage. If OK, replace the
faulty rear wiper motor. If not OK, repair the open
circuit(s) as required.

WASHER SYSTEM

FRONT
The diagnosis found here addresses an inoperative
washer pump or wipe-after-wash feature. If the
washer pump operates, but no washer fluid is emit-
ted from the washer nozzles, be certain to check the
OR
fluid level in the reservoir. Check for ice or other for-
eign material in the reservoir, and for pinched, dis-
connected, broken, or incorrectly routed washer
system plumbing. For circuit descriptions and dia-
grams, 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-
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 wiper switch to the Off position.
Depress the washer switch for less than one-half sec-
ond. The wipers should operate for one sweep cycle
and then park. Depress the washer switch for more
than one-half second. The washer pump should oper-
ate and the wipers should operate for two sweep
cycles after the switch is released before they park. If
the wipers are OK, but the washers are not, go to
Step 3. If the washers are OK, but the wipers are
not, go to Step 5.
(3) Turn the ignition switch to the Off position.
Disconnect and isolate the battery negative cable.
Unplug the front washer pump wire harness connec-
tor. Measure the resistance between the ground cir-
cuit cavity of the front washer pump wire harness
connector and a good ground. The meter should read
TO GROUP 8M -
STEERING COLUMN,
ZG
PASSIVE
OR