1994 JEEP CHEROKEE service

AUDIO SYSTEMS
CONTENTS
page page
GENERAL INFORMATION.................. 1
RADIO ANTENNA........................ 8XJ SERVICE PROCEDURES................ 4
YJ SERVICE PROCEDURES................ 6
GENERAL INFORMATION
DESCRIPTION
Each radio receives ignition feed from an ignition
switch controlled fuse. There is an additional in-line
fuse in the back of the radio chassis. The in-line fuse
will blow in the event an internal short occurs.
The electronically tuned radio (ETR)/cassette
models protect the vehicle from a radio failure
with an in-line fuse located in the rear of the ra-
dio chassis (Fig. 1).
XJ/YJ vehicles are equipped with an Ignition-Off
Draw (IOD) fuse that is removed when the vehicles
are shipped from the factory. This fuse is in the
Power Distribution Center to prevent battery dis-
charge during storage. For specific location refer to
Group 8W - Wiring Diagrams.
The IOD fuse is in the radio memory circuitry and
should be checked if the memory (time or radio sta-
tion programming) is inoperative.
All radios are connected to the radio illumination
relay. When the ignition switch is in ON or ACCES-
SORY and the radio illumination relay remains de-
energized, the radio receives battery voltage via the
relay from the:
²(20 amp #7 fuse YJ)
²(15 amp #2 fuse XJ).
The radio illumination relay is energized when the
headlamp switch is used to turn on the parklamps or
headlamps. Battery voltage is switched to the dimdisplay input of the radio through the relay contacts.
The radio panel illumination is dimmed for night
driving.
The ETR models require an additional battery feed
connection to the (10 amp #F16 fuse-YJ), (10 amp
#9 fuse-XJ) to retain the radio's memory when the
ignition switch is turned OFF.
ETR models are self-compensating. A radio
trimmer adjustment is not required.
DIAGNOSIS
RADIO INOPERATIVE
Turn ignition switch to ON
²Inspect the (#7-YJ), (#2-XJ) fuse and replace if
necessary.
²Measure voltage at battery side of the fuse. There
should be 12 volts. If not, repair open from ignition
switch.
²Inspect in-line fuse at rear of radio and replace if
necessary.
Turn ignition switch to OFF.
²Disconnect radio connector. Measure resistance
from radio ground pin to a clean chassis ground.
There should be zero ohms. If not, repair open be-
tween radio connector and ground.
NO AUDIO OUTPUT ON ONE OR MORE
SPEAKERS
Refer to Radio Connector Pins.
FRONT SPEAKERS
²Radio OFF, radio connector disconnected. Measure
resistance between radio left front feed and return
connector pins. Measure between right front feed and
return connector pins. The meter should read 5 to 8
ohms. If the meter reading is correct, remove radio
for service. If not, repair wiring or replace speakers
as required.
Fig. 1 In-Line Fuse Location
JAUDIO SYSTEMS 8F - 1

REAR SPEAKERS
²Radio OFF, radio connector disconnected. Measure
resistance between radio left rear feed and return
connector pins. Measure between right rear feed and
return connector pins. The meter should read 5 to 8
ohms. If meter reading is correct remove radio for
service. If not, repair wiring or replace speakers as
required.
DISTORTED AUDIO OUTPUT ON ONE OR
MORE SPEAKERS
²With the radio ON, substitute known good speaker
or speakers. If the sound is still distorted, remove ra-
dio for service.
WEAK OR NO RECEPTION; NO AUDIO
OUTPUT; BACKGROUND NOISE PRESENT
Ignition switch in ON, radio ON.
²Inspect antenna cable and connector at radio and
tighten or repair as necessary.
²Unplug coax cable and connectors from radio. Mea-
sure resistance from center conductor to coaxial
shield. The meter should read infinite resistance
(open). If it does not, replace antenna assembly.
²Measure resistance of antenna mast to tip of cen-
ter conductor at radio end of cable. The meter should
read 0 to 0.5 ohms. If it does not, replace lead-in ca-
ble or antenna assembly.
²Measure resistance from coaxial shield to chassis
ground (vehicle body). The meter should read zero
ohms. If it does not, ground antenna base to vehicle
body, or replace antenna assembly as required
For all problems with no or low audio output
not resolved by these tests, remove radio for ser-
vice.
MEMORY DOES NOT OPERATE
²Inspect (F16 in Power Distribution Center-YJ),
(#9 in Fuse Panel-XJ) fuse and replace if necessary.
²Measure voltage at battery side of previously ref-
erenced fuse. There should be 12 volts at battery side
of fuse. If not, check the Maxi fuse.
Refer to Group 8W - Wiring Diagrams.
²Measure voltage at radio connector pin 4. There
should be 12 volts. If meter reading is correct, re-
move radio for service. If not, repair open from fuse.
RADIO DISPLAY ILLUMINATION (PARKLAMPS
AND HEADLAMPS OPERATING NORMALLY)
Headlamp switch OFF, radio ON.
²Measure voltage at radio connector pin 10. There
should be 12 volts. If not, go to next step. If OK, re-
move radio for repair by authorized outlet.
²Measure voltage at illumination relay pin 3. There
should be 12 volts. If 12 volts present, replace illumi-
nation relay. If not, repair open in circuit.RADIO DISPLAY ILLUMINATION DIMMING CIRCUIT
Turn headlamp switch to PARKLAMPS for
voltage tests; turn headlamp switch to OFF for
resistance tests.
²Separate relay connector from radio illumination
relay. Measure resistance from relay connector pin 2
to a clean chassis ground. The meter should read
zero ohms. If not, repair open between relay connec-
tor and ground.
²Measure voltage at radio illumination relay pin 5.
There should be battery voltage. If not repair open
from headlamp switch.
²Measure voltage at radio illumination relay pin 4.
Voltage should vary with dimmer switch. If OK, go
to next step. If not, repair open circuit between pin 4
and interior lamp rheostat.
²Measure voltage at radio illumination relay pin
10. Voltage should vary with dimmer switch. If OK,
remove radio for repair by authorized outlet. If not,
replace radio illumination relay.NOISE INTERFERENCE CHANGES WITH
ENGINE SPEED
²Inspect connections at: generator, ignition module,
antenna coaxial ground, radio ground, body to engine
block ground (braided ground strap). Repair as re-
quired.
RADIO NOISE DIAGNOSIS
8F - 2 AUDIO SYSTEMSJ

XJ SERVICE PROCEDURES
RADIO REPLACEMENT
(1) Disconnect negative cable from battery.
(2) Remove instrument panel bezel attaching
screws (Fig. 1) and remove the bezel.
(3) Remove radio attaching screws (Fig. 2).
(4) Disconnect radio electrical connector, ground
lead and antenna lead (Fig. 3).
(5) To install radio, route harness above and to the
right of the radio cavity. Install the radio making
sure that clip on top of radio (Fig. 4) is installed in
mating slot of dash.
(6) Reverse removal procedures to finish installing
the radio.
RADIO SPEAKERS
INSTRUMENT PANEL MOUNTED SPEAKERS
(1) Remove park brake retaining screw from lower
instrument panel (Fig. 5).
(2) Remove retaining screws and the lower instru-
ment panel (Fig. 6).
(3) Unplug wire harness connector.
Fig. 3 Disconnect/Connect Radio Wiring Harnesses
Fig. 4 Install Clip In Underside of Dash
Fig. 5 Park Brake Release Handle
Fig. 1 Instrument Bezel Removal/Installation
Fig. 2 Remove/Install Radio Mounting Screws
8F - 4 AUDIO SYSTEMSJ

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

VEHICLE SPEED CONTROL SYSTEM
CONTENTS
page page
SERVICE PROCEDURES................... 9TEST PROCEDURES...................... 5
GENERAL INFORMATION
The vehicle speed control system (Fig. 1) is electri-
cally actuated and vacuum operated. The turn signal
lever on the steering column incorporates a slide
switch that has three positions OFF, ON or RE-
SUME. A SET button is in the end of the lever. This
device is designed to operate at speeds above approx-
imately 35 mph.
WARNING: THE USE OF SPEED CONTROL IS NOT
RECOMMENDED WHEN DRIVING CONDITIONS DO
NOT PERMIT MAINTAINING A CONSTANT SPEED,
SUCH AS HEAVY TRAFFIC OR ON ROADS THAT
ARE WINDING, ICY, SNOW COVERED, OR SLIP-
PERY.TO ACTIVATE:Put ON/OFF switch in ON posi-
tion. When the desired speed is achieved, push and
release the SET button to turn on and engage the
system. Remove foot from accelerator. Speed will be
maintained at this level.
TO DEACTIVATE:A soft tap of the brake pedal,
normal brake application or depressing the clutch
pedal while the system is engaged will disengage
speed control without erasing memory. A sudden in-
crease in engine speed may be experienced if the
clutch pedal is depressed while the speed control sys-
tem is engaged. Moving the slide switch to the OFF
position or turning the ignition OFF also disengages
the system and in addition erases the memory.
Fig. 1 Speed Control System
JVEHICLE SPEED CONTROL SYSTEM 8H - 1

SERVICE PROCEDURES
INDEX
page page
Servo Cable Replacement................... 9
Speed Control Servo Replacement............ 9Speed Control Switch Replacement............ 9
SPEED CONTROL SERVO REPLACEMENT
REMOVAL
(1) Disconnect vacuum hose at servo (Figs. 1 and
2).
(2) Disconnect electrical connector at servo.
(3) Remove 2 nuts from cable sleeve.
(4) Pull speed control cable away from servo to ex-
pose cable retaining clip.
(5) Remove clip attaching cable to servo.
(6) Pull servo away from mounting bracket.
INSTALLATION
(1) Insert servo studs through holes in servo
mounting bracket.
(2) With throttle blocked to full open position,
align hole in cable sleeve with hole in servo pin and
install retaining clip.
(3)
Insert servo studs through holes in cable sleeve.
(4) Install 2 attaching nuts and tighten to 6 Nzm
(50 in. lbs.).
(5) Connect vacuum hose to servo.
(6) Connect electrical connector to servo terminals.
SERVO CABLE REPLACEMENT
CAUTION: Use finger pressure only to remove the
speed control cable connector at the bell crank. Pli-
ers or screwdriver can break connector requiring
complete cable replacement.
(1) Using finger pressure only, remove speed con-
trol cable connector at bell crank by pushing connec-
tor off the bell crank (Fig. 3). DO NOT try to pull
connector off perpendicular to the bell crank.
(2) Squeeze tabs on speed control cable and push
out of locking plate (Fig. 4).
(3) Pull cable out of cable guide.
(4) Remove 2 nuts and cable housing from servo.
(5) Release cable clip from servo cable and remove
servo cable.
(6) To install, reverse the removal procedure.
SPEED CONTROL SWITCH REPLACEMENT
(1) Disconnect negative cable from battery.
(2) Remove horn button with a push and turn mo-
tion.
(3) Remove horn button components (Fig. 5).
(4) Turn ignition switch to LOCK position and re-
move steering wheel nut and washer.
(5) Scribe an alignment mark on the steering in
line with the mark already existing on the end of the
steering column.
Fig. 2 Speed Control ServoÐRight Hand Drive
Fig. 1 Speed Control ServoÐLeft Hand Drive
JVEHICLE SPEED CONTROL SYSTEM 8H - 9

²Measure voltage at wiper/washer switch connector
terminal B. Meter should read battery voltage. If
OK, repair open to washer pump. If not, replace
switch.
DIAGNOSING WINDSHIELD WASHER
(INTERMITTENT)
(1) Unplug washer pump connector.
²Measure resistance between terminal B at pump
and a clean chassis ground. Meter should read zero
ohms. If not, repair open to ground.
(2) Turn ignition switch to ACCESSORY and
washer switch to ON.
²Measure voltage at wipe module switch connector
terminal B (pink wire). Meter should read battery
voltage. If not, replace wiper switch.
²Measure voltage at wipe module motor connector
terminal B (brown wire). Meter should read battery
voltage. If not, replace module.
²Measure voltage at washer pump connector termi-
nal A at pump. Meter should read battery voltage. If
OK, replace pump. If not, repair open from wipe
module.
INTERMITTENT WIPER MODULE
The intermittent wiper module is non-serviceable.
Refer to the wiring schematic for connector call outs.
The intermittent wiper module is attached to the
lower instrument panel cover near the steering col-
umn with a patch of velcro.
LIFTGATE WIPER
GENERAL
The rear wiper motor contains electronic controls
to provide three operating modes.
²Intermittent wipe witha5to8second delay be-
tween sweeps.
²Constant wipe that operates in conjunction with a
washer.
²Park mode that operates when ignition or rear
wiper switch is turned OFF.
The rear wiper switch is located in the instrument
panel and is supplied current when the ignition
switch is in the ON position. When the switch is
placed in the intermittent wipe position it provides
current to the rear wiper motor. When it is held in
the wash/wipe position it provides current to both the
motor and the rear washer pump. The switch is
spring loaded in the wash/wipe position.
REMOVAL
(1) Remove the wiper arm assembly from the pivot
pin by depressing the tab (Fig. 1) and pulling
straight out.
(2) Slide clip along hose until clip is off hose
mounting.
(3) Disconnect the washer hose.(4) Remove pivot pin retaining nut.
(5) Remove external bezel and seal.
(6) Remove the liftgate interior trim panel.
(7) Disconnect the wiper motor at the wiring harness.
(8) Remove the wiper motor mounting screws.
(9) Remove the wiper motor.
INSTALLATION
(1) Position the motor (Fig. 2) in the liftgate cavity
with the pivot pin protruding through the hole in the
liftgate.
Fig. 1 Rear Wiper Arm Removal
Fig. 2 Rear Wiper Motor Removal/Installation
JWINDSHIELD WIPERS 8K - 5

LAMPS
CONTENTS
page page
EXTERIOR LAMPS....................... 1
INTERIOR LAMPS...................... 19SPECIFICATIONS....................... 23
EXTERIOR LAMPS
INDEX
page page
Back-up/Rear Turn Signal/Tail Lamp Bulb
Replacement........................... 9
Center High Mounted Stop Lamp (CHMSL)ÐXJ . 10
Center High Mounted Stop Lamp (CHMSL)ÐYJ . 11
Daytime Running Lights (Canada Only)........ 16
DRL Module Replacement.................. 16
Fog Lamp Beam Adjustment................ 12
Fog Lamp Bulb/Element Replacement......... 13
Fog Lamp Replacement................... 15
Fog Lamp Service Information............... 12
Fog Lamp Switch Replacement.............. 14
Fog Lamp Trouble Diagnosis................ 12
Front Park/Turn Signal Lamp Bulb Replacement . . 8
Headlamp Beam Adjustment................. 3
Headlamp Bulb Replacement................ 3
Headlamp Delay Function Trouble DiagnosisÐXJ
Vehicles.............................. 16Headlamp Delay Module ReplacementÐXJ
Vehicles.............................. 16
Headlamp Dimmer Switch Replacement........ 6
Headlamp Switch Replacement............... 4
Headlamp Trouble DiagnosisÐXJ Vehicles...... 1
Headlamp Trouble DiagnosisÐYJ Vehicles...... 2
License Plate Lamp....................... 10
Sentinel Headlamp Delay ModuleÐXJ Vehicles . . 15
Service Information........................ 1
Side Marker Lamp Bulb Replacement.......... 7
Switch Tests............................. 2
Underhood Lamp Bulb Replacement.......... 18
Underhood Lamp Replacement.............. 18
Underhood Lamp Service Information......... 17
SERVICE INFORMATION
Exterior lamp circuits are comprised of the head-
lamp circuit, fog lamp circuit, and tail/side marker/
park lamp circuit. Battery voltage is controlled by
both the headlamp ON/OFF switch and headlamp
dimmer switch.
The dimmer switch functions as a fog lamp switch.
Voltage is applied to the fog lamp switch only when
the dimmer switch is in the low beam position.
HEADLAMP TROUBLE DIAGNOSISÐXJ VEHICLES
LOW AND HIGH BEAM INOPERATIVE BOTH
HEADLAMPS
(1) Place the headlamp switch in the ON position.
(2) Test the 40 amp fuse for continuity. If bad, re-
place fuse.
(3) Insert the test probe into terminal 5 of the
front lamp wire harness connector. Measure the re-
sistance from terminal 5 to body ground. The ohm-
meter should indicate zero ohms. If not OK, repair
the open circuit in the harness to body ground.(4) Disconnect the front lamp wire connector. Mea-
sure resistance between connector terminals 5 and 2.
Next measure between terminal 5 and 7. The ohm-
meter should indicate zero ohms for both measure-
ments. If not OK, replace the headlamp bulbs.
(5) Measure the voltage between the dimmer
switch wire connector terminal 2 and body ground.
The voltmeter should indicate battery voltage. If not
OK, continue with the next step.
The dimmer switch is integral with the turn
signal and is located on the steering column.
The dimmer switch switches the headlamp beam
when the turn signal lever is pulled rearward.
(6) Disconnect the dimmer switch wire connector
and place the headlamp switch in the OFF position.
Measure the resistance from terminal 2 to vehicle
body ground. The ohmmeter should indicate infinite
resistance. If OK, replace the headlamp switch and
continue with the next step. If not OK, repair the
short circuit in the wire harness that leads to termi-
nal 2.
JLAMPS 8L - 1