Jeep 1996 Grand Cherokee Service Manual - page 366
output (F86) circuit cavity of the multi-function
switch connector. The meter should read battery volt-
age. If OK, go to Step 4. If not OK, repair the open
circuit as required.
(4) If the problem being diagnosed involves only
the intermittent wipe feature, go to Step 5. If the
problem being diagnosed involves all wiper modes, or
only the Low and/or High speed modes, go to Step 7.
(5) Turn the ignition switch to the Off position.
Disconnect and isolate the battery negative cable.
Unplug the white 24-way body control module con-
nector. Check for continuity between the wiper
switch mode sense cavities of the multi-function
switch and body control module connectors. There
should be continuity. If OK, go to Step 6. If not OK,
repair the open circuit as required.
(6) Unplug the black 24-way body control module
connector. Check for continuity between the wind-
shield wiper switch signal cavities of the multi-func-
tion switch and body control module connectors.
There should be continuity. If OK, see the Intermit-
tent Wipe Relay diagnosis in this group. If not OK,
repair the open circuit as required.
(7) Turn the ignition switch to the Off position.
Check for continuity between the two wiper switch
low speed output circuit cavities of the multi-function
switch connector. There should be continuity. If OK,
go to Step 8. If not OK, repair the open circuit as
required.
(8) Test the multi-function switch, as described in
this group. If the switch tests OK, reinstall the
switch connector and go to Step 9. If not OK, replace
the faulty switch and test the wiper system opera-
tion. If still not OK, go to Step 9.
(9) Measure the resistance between the ground cir-
cuit cavity of the wiper motor connector and a good
ground. The meter should read zero ohms. If OK, go
to Step 10. If not OK, repair the circuit to ground as
required.
(10) Turn the ignition switch to the Accessory or
On position. Place the multi-function switch in the
positions indicated in the tests below, and check for
voltage at the wiper motor connector.
(a) Measure the voltage at the fused ignition
switch output circuit cavity of the connector with
the wiper switch in any position. The meter should
read battery voltage. If OK, go to Step 2. If not
OK, repair the open circuit as required.
(b) Measure the voltage at the wiper switch low
speed output circuit cavity of the wiper motor con-
nector with the wiper switch in the Low position.
The meter should read battery voltage. If OK, go to
Step 3. If not OK, repair the open circuit as
required.
(c) Measure the voltage at the wiper switch high
speed output circuit cavity of the connector with
the wiper switch in the High position. The meter
should read battery voltage. If OK, go to Step 4. If
not OK, repair the open circuit as required.
(d) Measure the voltage at the wiper park switch
sense circuit cavity of the connector with the wiper
switch in the Low or High position, then move the
switch to the Off position. The meter should switch
between battery voltage and zero volts while the
wipers are cycling. Then, 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
GROUP
8M
-
PASSIVE
RESTRAINT
SYSTEMS
BEFORE
ATTEMPTING
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 fuse in the junction block. If OK, go
to Step 2. If not OK, 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 connec-
tor. If OK, go to Step 3. If not OK, repair the open
circuit as required.
(3) Test the rear wiper switch, as described in this
group. If OK, go to Step 4. If not OK, replace the
faulty switch.
(4) Turn the ignition switch to the Off position.
Remove the liftgate inner trim panel. Measure the
resistance between the ground circuit cavity of the
rear wiper motor 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 wiper motor connector and
a good ground. There should be continuity with lift-
gate and/or liftglass (if equipped) open, and no conti-
nuity with the liftgate and liftglass (if 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) Turn the ignition switch to the On position,
and place the rear wiper switch in the Wipe position.
Measure the voltage at the rear wiper motor control
circuit cavity of the motor connector. Repeat the test
for the rear wiper motor control (intermittent) circuit
ZJ
WIPER AND WASHER SYSTEMS
8K - 5
DIAGNOSIS AND TESTING (Continued)