1994 JEEP CHEROKEE Service Repair Manual

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

²Inspect secondary ignition system components:
wire routing and condition, distributor cap and rotor,
ignition coil, spark plugs. Reroute or replace as re-
quired.RADIO ILLUMINATION RELAY
XJ
The radio illumination relay is in the relay center.
The relay center is located on the lower instrument
panel trim cover, right of the steering column
(Fig. 2).
YJ
The radio illumination relay is taped to the har-
ness above the radio.
RADIO CONNECTOR PINS
Fig. 2 Radio Illumination Relay
JAUDIO SYSTEMS 8F - 3

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

(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) Remove bolt that attaches the pedal assembly
to the instrument panel and allow pedal assembly to
fall out of the way.
(3) Reach up behind instrument panel and remove
4 stamped nuts holding speaker in place.
(4) Disconnect speaker electrical connector and re-
move speaker.
SOUND BARÐSPEAKER REMOVAL
(1) Pull sound bar padding away from bar on the
passenger side (Fig. 3).
(2) Disconnect speaker harness connector located
on the passenger side at the sound bar.
(3) Remove screws holding speaker grille and
speaker to bar.
(4) Disconnect wires from speaker and remove
speaker.
(5) To install speaker, reverse the removal proce-
dures.
SOUND BAR REPLACEMENT
(1) Disconnect speaker harness connector located
on the passenger side at the sound bar (Fig. 3)
(2) Remove bolts attaching the sound bar side
flanges to the right and left side bars.
(3) Open zipper on sport bar cover.(4) Remove bolts attaching the sound bar brackets
to the sport bar (located on the rear of the sport bar)
(Fig. 4). Slip brackets through the sport bar cover.
(5) To install the sound bar, reverse the removal
procedures.
Fig. 2 Parking Brake Assembly
Fig. 3 Sound Bar Speaker Connector
Fig. 4 Rear Sound Bar Attaching Bolt
JAUDIO SYSTEMS 8F - 7

RADIO ANTENNA
INDEX
page page
Antenna Tests............................ 9
General Information........................ 8Replacement............................. 8
GENERAL INFORMATION
AM/FM radio model antennas must have a good
ground to eliminate static. The antenna mast is con-
nected to the inner wire of the coaxial cable and is
not grounded to any part of the vehicle. The coaxial
shield (the wire mesh) surrounding the center con-
ductor wire of the antenna lead-in cable is grounded
to the radio and the antenna base.
REPLACEMENT
XJ
(1) Remove the fender inner splash panel mount-
ing nuts (Fig. 1) and move the panel aside to gain ac-
cess to the antenna base and cable.
The splash panel screws may be covered with
undercoating.
(2) Remove the antenna mast, nut and antenna
pad from the top of the fender (Fig. 2).
(3) Remove the passenger side kick panel.
(4) Disconnect the antenna lead (Fig. 3) by pulling
apart while twisting the metal connectors. DO NOT
PULL ON THE COAXIAL CABLE.
(5) Pull the rubber grommet out of the kick panel.(6) Remove the antenna assembly from inside the
wheel well.
(7) To install the antenna, reverse the removal
procedure.
(8) Verify antenna and radio operation.
(9) Apply 3M Rubberized Undercoating, or equiva-
lent to the splash panel screws.
YJ
(1) Remove the radio as described in Radio Re-
placement.
(2) Remove three screws holding the antenna base
and pad to the body (Fig. 4).
(3) Pull the antenna and cable out of the vehicle.
(4) To install the antenna, make sure the antenna
pad is placed over the cable and guide the cable un-
der the instrument panel.
(5) Secure the antenna base and pad with three screws.
(6) Install the antenna into the radio and install
the radio.
Fig. 1 Remove/Install Fender Inner Splash Panel
Fig. 2 Remove/Install Nut and Antenna Pad
8F - 8 AUDIO SYSTEMSJ

ANTENNA TESTS
Antenna ground continuity is checked with an ohm-
meter. The following four tests are required (Fig. 5):
²Mast-to-ground test 1.
²Tip of mast-to-tip of conductor test 2.
²Body ground-to-battery ground test 3.
²Body ground-to-coaxial shield test 4.
Ohmmeter test lead connections are shown in the
following schematic.
MAST-TO-GROUND TEST 1.
Test 1 determines if the antenna mast is insulated
from the base. Procedure is as follows:²Connect one ohmmeter lead to tip of antenna mast
and the other lead to the antenna base.
²With the antenna disconnected from the radio,
there should not be continuity.
TIP OF MAST-TO-TIP OF CONDUCTOR TEST 2.
Test 2 checks the antenna for an open circuit as fol-
lows:
²Disconnect the antenna cable from the radio.
²Connect one ohmmeter test lead to tip of mast.
Connect remaining lead to tip of antenna cable
lead-in (the part inserted into the radio).
²Continuity should exist (ohmmeter should only
register a fraction of an ohm). High or infinite resis-
tance suggests damage to the base and cable assem-
bly that should be replaced.
BODY GROUND-TO-BATTERY GROUND TEST 3.
Test 3 checks condition of the vehicle body ground
connection as follows:
²
Connect one ohmmeter test lead to the vehicle fender
and the other lead to the battery negative post.
²Resistance should be less than one ohm.
²If resistance is more than one ohm, check the
braided ground strap connected to the engine and ve-
hicle body for being loose, corroded, or damaged. Re-
pair as necessary.
BODY GROUND-TO-COAXIAL SHIELD TEST 4.
Test 4 checks condition of the ground between the
antenna base and vehicle body as follows:
²Connect one ohmmeter test lead to the fender and
the other lead to the crimp on the coaxial shield.
²Resistance should be less then one ohm.
²
If resistance is more then one ohm, replace the antenna
base attaching screws with new cadmium plated screws.
Fig. 3 Disconnect Antenna Lead
Fig. 4 Antenna Removal/Install - YJ
Fig. 5 Antenna Tests
JAUDIO SYSTEMS 8F - 9