1994 JEEP CHEROKEE window

ELECTRICAL
GROUP INDEX
Group Group
AUDIO SYSTEMS....................... 8F
BATTERY/STARTER/GENERATOR SERVICE . . 8B
BATTERY/STARTING/CHARGING SYSTEMS
DIAGNOSTICS........................ 8A
CHIME/WARNING BUZZER SYSTEM....... 8U
HORNS............................... 8G
IGNITION SYSTEMS.................... 8D
INSTRUMENT PANEL AND GAUGES........ 8E
LAMPS............................... 8L
OVERHEAD CONSOLE................... 8CPOWER LOCKS........................ 8P
POWER MIRRORS...................... 8T
POWER SEAT.......................... 8R
POWER WINDOWS..................... 8S
REAR WINDOW DEFOGGER.............. 8N
TURN SIGNALS AND HAZARD WARNING
FLASHERS........................... 8J
VEHICLE SPEED CONTROL SYSTEM....... 8H
WINDSHIELD WIPERS AND WASHERS..... 8K
WIRING DIAGRAMS.................... 8W
BATTERY/STARTING/CHARGING SYSTEMS DIAGNOSTICS
CONTENTS
page page
BATTERY TEST PROCEDURES............. 2
ENGINE STARTER MOTOR TEST
PROCEDURES ON VEHICLE.............. 9GENERATOR TEST PROCEDURES ON
VEHICLE............................. 14
IGNITION OFF DRAW (IOD) DIAGNOSIS...... 8
USING ON-BOARD DIAGNOSTIC SYSTEM.... 19
GENERAL INFORMATION
The battery, starting, and charging systems oper-
ate with one another, and therefore, must be thor-
oughly tested as a complete system. In order for the
vehicle to start and charge properly, it must have a
battery that will perform to specifications. The
starter motor, generator, wiring, and electronics also
must perform within specifications. Group 8A covers
starting (Fig. 1) and charging (Fig. 2) system diag-
nostic procedures. These procedures include the most
basic conventional methods to On-Board Diagnostics
(OBD) built into the Powertrain Control Module
(PCM). Use of an ammeter, volt/ohmmeter, battery
charger, carbon pile rheostat (load tester), and 12-
volt test lamp will be required.
All OBD sensing systems are monitored by the
PCM. The PCM will store in memory any detectable
failure in the monitored circuits. Refer to Using On-
Board Diagnostic System in this group for more in-
formation.
Fig. 1 Starting System Components (Typical)
JELECTRICAL 8A - 1

(4) Remove speaker screws and speaker from lower
instrument panel (Fig. 7).
(5) To install speaker, reverse the removal proce-
dures.
FRONT DOOR-MOUNTED RADIO SPEAKERS
(1) Remove interior door latch release assembly
and control panel retaining screws (Fig. 8).
(2) Disconnect control linkage and wire harness
connector.
(3) Remove latch release and control panel assem-
bly.
(4) Remove armrest lower retaining screws.
(5) Swing armrest downward to a vertical position.
This is necessary to disconnect armrest from upper
retainer clip (Fig. 9).
(6) Pull armrest straight out from trim panel.
(7) Remove trim panel with a wide flat blade tool
(Fig. 10).
To aid in removal of trim panel, start at the
bottom of the panel.
(8) Remove speaker attaching screws and discon-
nect speaker at wire harness.(9) To install a speaker, connect the speaker wire
harness and reverse the removal procedure.
REAR LIFTGATE-MOUNTED RADIO SPEAKER
REMOVAL
(1) Remove 2 screws at top outside edges of liftgate
trim panel.
(2) Remove trim panel with a wide flat blade tool
(Fig. 11).
To aid in removal of trim panel, start at the
bottom of the panel.
(3) Remove speaker attaching screws (Fig. 12).
(4) Disconnect speaker at wiring harness and re-
move speaker.
Fig. 6 Lower Instrument Panel Removal/Installation
Fig. 7 Tweeter Speaker Removal/Installation
Fig. 8 Power Window Control Panel Removal/
Installation
Fig. 9 Armrest Retainer Clip
JAUDIO SYSTEMS 8F - 5

INSTALLATION
(1) Connect speaker at wiring harness.
(2) Install speaker.
(3) Install trim panel by pushing in the plastic
trees.
(4) Install door panel screws.
YJ SERVICE PROCEDURES
RADIO REPLACEMENT
(1) Disconnect negative cable from battery.
(2) Remove gauge cluster panel bezel attaching
screws (Fig. 1).
(3) Remove radio bezel.
(4) Remove radio attaching screws.
(5) Disconnect radio antenna cable.
(6) Disconnect radio wire harness.
(7) Remove radio.(8) To install radio, reverse the removal proce-
dures.
RADIO SPEAKERS
PASSENGER SIDE
The speaker is located behind grille panel at right
end of the instrument panel.
(1) Reach up behind instrument panel and remove
4 stamped nuts holding the speaker in place.
(2) Disconnect speaker electrical connector and re-
move speaker.
DRIVERS SIDE
The speaker is located behind grille panel at left
end of the dash panel.
(1) Remove nuts that attach the parking brake
pedal assembly mounting studs to the dash panel.
The nuts are accessible from the engine compartment
(Fig. 2).
CAUTION: If vehicle is equipped with a rear window
wiper, there is a ground wire attached to top of bolt
that attaches the pedal assembly to the instrument
panel.
Fig. 10 Trim Panel Removal
Fig. 11 Liftgate Trim Panel Removal
Fig. 12 Liftgate Speaker
Fig. 1 Gauge Cluster Bezel Removal/Installation
8F - 6 AUDIO SYSTEMSJ

(2) Install the mounting screws.
(3) Connect the wiring harness.
(4) Install the pivot pin, seal, bezel and attaching
nut (Fig. 2). Torque nut to 4 Nzm (32 in. lbs.).
(5) Connect interior washer hose.
Lubricate the bezel nipples with a small amount
of water and then install the washer hoses.
(6) Install the liftgate trim panel.
(7) Install the wiper arm assembly and connect the
external washer hose to the bezel.
(8) Slide the clip along the hose until it is over
hose mount.
The blade should be parallel to window open-
ing and no closer than 5mm to window seal
when operated on a wet window (Fig. 3).
WASHER PUMP REPLACEMENT
The washer pump for the liftgate is located next to
the front washer pump on the washer reservoir in
the engine compartment. For replacement refer to
the front washer pump replacement procedure.
LIFTGATE WIPER SWITCH REPLACEMENT
(1) Remove the instrument panel bezel; see Instru-
ment Panel and Components Section for the proce-
dure.
(2) Remove the switch housing panel.
(3) Unplug the switch connector. Slightly depress
the switch mounting tabs and remove the switch
(Fig. 4).
DIAGNOSING REAR WIPER
(1) Remove and inspect 25 amp, #1 fuse. Replace
as required.
(2) Turn ignition switch to ACCESSORY and rear
wiper switch to WASH.
²Measure voltage at rear wiper switch terminal B.
Meter should read battery voltage. If not, repair open
to #1 fuse.
²Measure voltage at rear wiper switch terminals A,
C and D. Meter should read battery voltage. If not,
replace switch.(3) Turn ignition switch to ACCESSORY, place
rear wiper switch in WIPE. Measure voltage at rear
wiper switch terminal C. Meter should read battery
voltage. If not, replace switch.
(4) Remove liftgate cover and measure resistance
from rear wiper motor terminal 1 to a good ground.
Meter should read zero ohms. If not, repair open to
ground splice.
(5) Turn ignition switch to ACCESSORY and rear
wiper switch to WASH.
²Measure voltage at motor connector terminals 2, 3
and 4. Meter should read battery voltage. If OK, re-
place wiper motor. If not, repair open(s) to rear wiper
switch.
DIAGNOSING REAR WIPER WASHER
(1) Turn ignition switch to ACCESSORY and place
rear wiper/washer switch in WASH.
²Operate rear wiper motor. If motor does not oper-
ate check the 25 amp #1 fuse.
(2) Turn ignition switch to ACCESSORY and un-
plug rear washer pump connector.
²Measure resistance at pump connector terminal B
(ignition switch OFF). Meter should read zero ohms.
If not, repair open to ground.
²Measure voltage at pump connector terminal A,
switch in WASH. Meter should read battery voltage.
If OK, replace pump. If not, go to step 3.
(3) Remove switch and reconnect below instrument
panel. Backprobe switch connector with ignition
switch in ACCESSORY.
²Measure voltage at switch connector terminal B.
Meter should read battery voltage. If not, repair open
to fuse.
²Measure voltage at switch connector terminal A,
switch in WASH. Meter should read battery voltage.
If not, replace switch.
Fig. 3 Rear Wiper Arm Positioning
Fig. 4 Rear Wiper Switch
8K - 6 WINDSHIELD WIPERSJ

CAUTION: DO NOT move the wiper switch to DE-
LAY with the intermittent wiper module removed
from the circuit. If the switch is moved to the DE-
LAY position during the next step, the switch will
be damaged.
²Test wiper operation in LOW and HIGH speed
modes, and test washer operation. If these modes
were inoperative, but are OK now, replace failed in-
termittent wiper module.
(4) To test the wiper/washer switch, see Wiper
Switch Testing. Turn ignition switch to OFF. Posi-
tion the wiper switch as indicated, and back probe
switch side of wiper switch connector. If switch tests
OK, go to step 5. If not, replace switch and go to step
6.
(5) To further test the wiper/washer switch, turn
ignition switch to ACCESSORY or ON. Position the
wiper switch as indicated in the tests below, and
back probe switch side of wiper switch connector.
²Measure voltage at terminal E with wiper switch
in LOW, MIST and with washer switch depressed.
Meter should read battery voltage. If not, replace
switch.
²Measure voltage at connector terminal C with
wiper switch in HIGH. Meter should read battery
voltage. If not, replace switch.
²With wiper switch in LOW or HIGH, measure
voltage at connector terminal F, then move wiper
switch to OFF. Meter shold read battery voltage un-
til wipers park and then zero volts. If OK, go to step
6. If not, check wiring to wiper motor, then go to step
6.
(6) To test the wiper motor, turn the ignition
switch to ACCESSORY or ON. Position the wiper
switch and back probe the motor connector as indi-
cated.
²Wiper switch in any position, measure voltage at
terminal B. Meter should read battery voltage. If not,
repair wiring from circuit breaker.
²Wiper switch in LOW, measure voltage at termi-
nal A. Meter should read battery voltage. If OK, but
wipers do not operate, replace failed wiper motor. If
not, repair wiring from switch or intermittent wiper
module connector.
²Wiper switch in HIGH, measure voltage at termi-
nal H. Meter should read battery voltage. If OK, but
wipers do not operate, replace failed wiper motor. If
not, repair wiring from switch or intermittent wiper
module connector.
²Wiper switch in LOW or HIGH, voltmeter con-
nected to terminal D. Turn wiper switch to OFF and
observe meter. Meter should read battery voltage
when switch goes to OFF, then zero volts after wip-
ers park. If battery voltage is present, but wipers fail
to park; or, if no battery voltage present, replace
failed wiper motor.DIAGNOSING NON-INTERMITTENT WINDSHIELD
WASHER
Refer to Group 8W - Wiring Diagrams.
(1) Measure resistance from washer pump connec-
tor terminal B to a clean chassis ground. Meter
should read zero ohms. If not, repair open between
terminal B and ground.
(2) Turn ignition switch to ON and press washer
switch.
²Measure voltage at switch connector terminal B.
Meter should read battery voltage. If not, replace
wiper/washer switch.
²Measure voltage at washer pump connector termi-
nal A. Meter should read battery voltage. If OK, re-
place pump. If not, repair open between switch
connector and pump connector.
DIAGNOSING INTERMITTENT WINDSHIELD
WASHER
Refer to Group 8W - Wiring Diagrams.
(1) Measure resistance from washer pump connec-
tor terminal B to a clean chassis ground. Meter
should read zero ohms. If not, repair open between
terminal B and ground.
(2) Turn ignition switch to ON and rotate washer
switch tab forward.
²Measure voltage at wiper/washer switch connector
terminal B located at intermittent wipe module.
Meter should read battery voltage. If not, replace
wiper switch.
²Measure voltage at intermittent wipe module con-
nector terminal B (to washer pump). Meter should
read battery voltage. If not, replace intermittent
wipe module.
²Measure voltage at washer pump connector termi-
nal A. Meter should read battery voltage. If OK, re-
place pump. If not, repair open from intermittent
wipe module connector terminal B.
REAR WIPER ARM REPLACEMENT
(1) Install wiper arm remover, Snap On A192 or
equivalent, on wiper arm (Fig. 11). Lift arm and then
remove from pivot shaft.
CAUTION: Do not use a screwdriver or other prying
tool to remove an arm. This may distort it in a way
that will allow it to come off the pivot shaft in the
future, despite how carefully it is installed. NEVER
push or bend the spring clip in the base of the arm
in an attempt to release the arm. This clip is self re-
leasing.
(2) To install, reverse the removal procedure.
(3) Wet the window and check the park position by
operating the wiper motor several times.
8K - 12 WINDSHIELD WIPERSJ

REAR WASHER PUMP REPLACEMENT
The washer pump for the rear window is located
next to the front washer pump on the washer reser-
voir in the engine compartment (Fig. 12). For re-
placement refer to the front washer pump
replacement procedure.
REAR WIPER SWITCH REPLACEMENT
(1) Remove the instrumentation shroud; see In-
strument Panel, Indicator Bezel Replacement.
(2) Remove the switch housing panel.
(3) Unplug the switch connector. Slightly depress
the switch mounting tabs and remove the switch
(Fig. 13).
REAR WIPER MOTOR REPLACEMENT
(1) Remove wiper arm from motor (refer to Wiper
Arm Replacement).
(2) Remove pivot shaft retaining nut.
(3) Remove motor trim cover (Fig. 14).
(4) Disconnect electrical connector (Fig. 15).
(5) Remove hinge nut holding motor to top.
(6) To install, reverse the removal procedures.
WASHER NOZZLE REPLACEMENT
(1) From inside the vehicle remove the motor trim
cover.
(2) Remove the washer hose from the back of the
washer nozzle.
(3) Remove the nut holding the nozzle to the glass.
(4) Install the new washer nozzle.
Fig. 11 Removing Liftgate Wiper Arm
Fig. 12 Rear Washer Pump
Fig. 13 Rear Wiper Switch
Fig. 14 Rear Wiper Motor Cover
JWINDSHIELD WIPERS 8K - 13

REAR WINDOW DEFOGGER
CONTENTS
page page
GENERAL.............................. 1
XJ .................................... 4YJ .................................... 4
GENERAL
INDEX
page page
Diagnosis............................... 2
Rear Window Defogger Grid Repair........... 2Rear Window Defogger Grid Test............. 1
Switch Testing............................ 2
Using heating elements bonded to the rear window
glass, the rear defogger will clear condensation, frost
and light snow coverings from the rear window.
The horizontal grid lines and vertical bus bar lines,
printed and baked on inside surface of the rear win-
dow glass, comprise an electrical circuit. The electri-
cally conductive lines are composed of a silver-
ceramic material which when baked on glass
becomes bonded to the glass and is highly resistant
to abrasion.
The electrical current required to produce the heat
in the grid is supplied through a relay and driver op-
erated switch. When the switch is momentarily de-
pressed, the relay senses a voltage change. This
voltage change causes the relay to change state and
complete a circuit to energize the relay. Once the re-
lay energizes, the contacts close connecting the grid
to battery power.
On the XJ, the power circuit to the grid is pro-
tected by the 25 amp, #18 fuse in the fuse box.
Power for fuse #18 comes from the power distribu-
tion center, fuse #F10. Power for the relay is pro-
tected by the 20 amp, #8 fuse located in the fuse box.
On the YJ, the grid is protected by a 25 amp #6
fuse, located in the fuse box. Power for the relay is
protected by 15 amp #9 fuse, located in the fuse box.
To defog the rear window, momentarily depress the
rocker switch. A light on the rocker switch will illu-
minate indicating that the defogger is operating.
If the ignition switch is ON the first activation of
the defog/defrost feature will last for 10 minutes.
Succeeding activations will last for 5 minutes unless
the ignition switch is turned OFF; then it will recy-
cle back to 10 minutes for the first activation.To stop defogger operation, momentarily push the
switch a second time.
CAUTION: Use care when washing the inside of the
rear window to prevent damage to the defogger
heating elements. Use a soft cloth and a mild wash-
ing solution. Wiping motions should be parallel to
the heating elements. Also, keep all objects a safe
distance from the window to prevent damaging the
heating elements.
REAR WINDOW DEFOGGER GRID TEST
It is possible, that a break may exist or occur in an
individual grid line resulting in no current flow
through the line. When a grid has an open circuit,
the area of glass normally cleared by that grid re-
mains fogged or iced unless, and until it is cleared by
the adjacent grids.
With the engine running at idle, push the rear
window defogger switch to the ON position and re-
lease. The pilot lamp in the rocker switch should
light, indicating defogger operation.
Using a 12-volt DC voltmeter, contact the positive
lead to the feed side vertical bus element on the in-
side surface of the glass. Contact the negative lead to
the ground side bus element. Meter should read be-
tween 11 and 13 volts. Connect the negative lead of
the voltmeter to a good ground; the meter reading
should be constant.
Keep the negative lead connected to ground. Use
the positive lead and carefully contact each grid at
the approximate centerline of the window.
JREAR WINDOW DEFOGGER 8N - 1

A voltage drop of one-half the full amount, approx-
imately 6 volts, indicates a good grid or closed cir-
cuit.
A voltage drop of 12 volts at the centerline indi-
cates a break in the grid between the positive volt-
meter lead and the ground.
No voltage drop (0 volts) at the centerline indicates
a break in the grid between the centerline and the
voltage source or lead.
The exact location of the break can be pinpointed
by moving positive voltmeter lead to the left or right
along grid. An abrupt change in the voltage reading
will be noticed. The break is at that point in the
grid.
REAR WINDOW DEFOGGER GRID REPAIR
Locate the broken or open grid.
Use the grid repair kit (available as a service part)
by using the following procedure:
(1) Mark the location of the broken or open grid on
the exterior surface of the glass using a suitable
marking pencil.
(2) Lightly rub the area to be repaired (inside the
rear window) using fine steel wool. Clean the area
with alcohol.
(3) Attach two strips of masking tape to the inside
surface of the rear window (above and below the
break in the grid) (Fig. 1).
(4) Remove package separator clamp and mix plas-
tic conductive epoxy thoroughly. Fold in half and cut
center corner to dispense epoxy.
(5) Apply conductive epoxy through slit in mask-
ing tape. Overlap both ends of the break.
(6) For a terminal or pigtail replacement, mask ad-
jacent areas so epoxy can be extended onto line and
buss bar. Apply a thin layer of epoxy to area where
terminal was fastened and to adjacent line.
(7) Apply a thin layer of conductive epoxy on ter-
minal and place terminal on desired location. To pre-
vent terminal from moving while the epoxy is curing,
it must be wedged or clamped.
(8) Carefully remove masking tape from grid line.
(9) Allow epoxy to cure 24 hours at room tempera-ture or use heat gun with a 260É-371ÉC (500É-700ÉF)
range for 15 minutes. Hold gun approximately
254mm (10 inches) from repaired area.
(10) After conductive epoxy is properly cured re-
move wedge from terminal and check out operation
of rear window defogger. Do not attach connectors
until curing is complete.
WARNING: REPAIR KIT MAY CAUSE SKIN OR EYE
IRRITATION.
CONTAINS EPOXY RESIN AND AMINE TYPE
HARDENER, HARMFUL IF SWALLOWED. AVOID
CONTACT WITH SKIN AND EYES. FOR SKIN,
WASH AFFECTED AREAS WITH SOAP AND WA-
TER. DO NOT TAKE INTERNALLY. IF TAKEN
INTERNALLY, INDUCE VOMITING; CALL A
PHYSICIAN IMMEDIATELY. IF IN CONTACT
WITH EYES, FLUSH WITH PLENTY OF WATER.
USE WITH ADEQUATE VENTILATION. DO NOT
USE NEAR FIRE OR FLAME. CONTENTS CON-
TAIN 3% FLAMMABLE SOLVENTS.
WARNING: KEEP OUT OF REACH OF CHIL-
DREN.
SWITCH TESTING
DIAGNOSIS
Refer to Group 8W - Wiring Diagrams for a com-
plete circuit diagram.
BATTERY, IGNITION & FUSES
²Check fuses #6 and #9 (YJ), or #8 and #18 fuse
(XJ). Replace as required.
²If the fuses are not blown check the battery side of
#18 fuse (XJ) or fuse #6 (YJ) for battery voltage. If
battery voltage is not present replace the Maxi fuse
located in the power distribution center.
²Check the ignition side of fuse #9 (YJ), fuse #8
(XJ) for battery voltage. If battery voltage is not
present check for an open from the ignition switch.
DEFOGGER SWITCH
Defogger switch connector separated from de-
fogger switch; turn ignition switch to ON for
voltage tests; turn ignition switch to OFF for re-
sistance tests
²Measure voltage at defogger switch connector ter-
minal D. The meter should read approximately 5
volts momentarily. If not, repair open from relay.
²Refer to switch diagram for resistance tests. If val-
ues do not match, replace defogger switch.
DEFOGGER RELAY
Defogger relay connector separated from de-
fogger relay; turn ignition switch to ON for volt-
age tests; turn ignition switch to OFF for
resistance tests
Fig. 1 Grid Line Repair (Typical)
8N - 2 REAR WINDOW DEFOGGERJ