2002 JEEP GRAND CHEROKEE CD player

CONDITION POSSIBLE CAUSES CORRECTION
POOR RADIO RECEPTION 1. Antenna faulty. 1. (Refer to 8 - ELECTRICAL/AUDIO/ANTENNA
BODY & CABLE - DIAGNOSIS AND TESTING).
2. Radio ground faulty. 2. Check for continuity between radio chassis and
a known good ground. There should be
continuity. Repair ground, if required.
3. Radio noise suppression
faulty.3. (Refer to 8 - ELECTRICAL/AUDIO/RADIO
NOISE SUPPRESSION - DIAGNOSIS AND
TESTING).
4. Radio faulty. 4. (Refer to 8 - ELECTRICAL/AUDIO/RADIO -
DIAGNOSIS AND TESTING).
NO/POOR TAPE
OPERATION1. Faulty tape. 1. Insert known good tape and test operation.
2. Foreign objects behind
tape door.2. Remove foreign objects and test operation.
3. Dirty cassette tape head. 3. Clean head with Mopar Cassette Head
Cleaner.
4. Faulty tape deck. 4. Exchange or replace radio, if required.
NO COMPACT DISC
OPERATION, OR CD
SKIPPING SOUND1. Faulty CD. 1. Insert known good CD and test operation.
2. Foreign material on CD. 2. Clean CD and test operation.
3. Condensation on CD or
optics.3. Allow temperature of vehicle interior to stabilize
and test operation.
4. Faulty CD player. 4. Exchange or replace radio, if required.
NO COMPACT DISC
CHANGER OPERATION, OR
CD SKIPPING SOUND1. Faulty CD. 1. Insert known good CD and test operation.
2. Foreign material on CD. 2. Clean CD and test operation.
3. Condensation on CD or
optics.3. Allow temperature of vehicle interior to stabilize
and test operation.
4. CD changer connector
faulty.4. Check for loose or corroded CD changer
connections. Repair, if required.
5. Wiring faulty. 5. Refer to Compact Disc Changer in the
Diagnosis and Testing section of this group.
6. PCI data bus faulty. 6. Use DRB scan tool and the Diagnostic
Procedures manual to test PCI data bus. Repair,
if required.
7. CD changer faulty. 7. Refer to Compact Disc Changer in the
Diagnosis and Testing section of this group.
WJAUDIO 8A - 5
AUDIO (Continued)

problem being diagnosed is related to one of the
symptoms listed below, be certain to check the
remote radio switches and circuits. (Refer to 8 -
ELECTRICAL/AUDIO/REMOTE SWITCHES -
OPERATION).
²Stations changing with no remote radio switch
input
²Radio memory presets not working properly
²Volume changes with no remote radio switch
input
²Remote radio switch buttons taking on other
functions
²CD player skipping tracks
²Mode (AM, FM, CD, CD changer) changes with
no remote radio switch input
²Remote radio switch inoperative.
For complete circuit diagrams, refer to the appro-
priate wiring information. The wiring information
includes wiring diagrams, proper wire and connector
repair procedures, details of wire harness routing
and retention, connector pin-out information and
location views for the various wire harness connec-
tors, splices and grounds.
WARNING: DISABLE THE AIRBAG SYSTEM
BEFORE ATTEMPTING ANY STEERING WHEEL,
STEERING COLUMN, SEAT BELT TENSIONER, SIDE
AIRBAG, OR INSTRUMENT PANEL COMPONENT
DIAGNOSIS OR SERVICE. DISCONNECT AND ISO-
LATE THE BATTERY NEGATIVE (GROUND) CABLE,
THEN WAIT TWO MINUTES FOR THE AIRBAG SYS-
TEM CAPACITOR TO DISCHARGE BEFORE PER-
FORMING FURTHER DIAGNOSIS OR SERVICE. THIS
IS THE ONLY SURE WAY TO DISABLE THE AIRBAG
SYSTEM. FAILURE TO TAKE THE PROPER PRE-
CAUTIONS COULD RESULT IN ACCIDENTAL AIR-
BAG DEPLOYMENT AND POSSIBLE PERSONAL
INJURY.
CAUTION: The speaker output of the radio receiver
is a ªfloating groundº system. Do not allow any
speaker lead to short to ground, as damage to the
radio receiver may result.
(1) Check the fused B(+) fuse in the junction block.
If OK, go to Step 2. If not OK, repair the shorted cir-
cuit or component as required and replace the faulty
fuse.
(2) Check for battery voltage at the fused B(+) fuse
in the junction block. If OK, go to Step 3. If not OK,
repair the open fused B(+) circuit to the Power Dis-
tribution Center (PDC) fuse as required.
(3) Check the fused ignition switch output (acc/
run) fuse in the junction block. If OK, go to Step 4. If
not OK, repair the shorted circuit or component as
required and replace the faulty fuse(s).(4) Turn the ignition switch to the On position.
Check for battery voltage at the fused ignition switch
output (acc/run) fuse in the junction block. If OK, go
to Step 5. If not OK, repair the open fused ignition
switch output (acc/run) circuit to the ignition switch
as required.
(5) Turn the ignition switch to the Off position.
Disconnect and isolate the battery negative cable.
Remove the radio receiver from the instrument
panel, but do not disconnect the wire harness connec-
tors. Check for continuity between the radio receiver
chassis and a good ground. There should be continu-
ity. If OK, go to Step 6. If not OK, repair the open
ground circuit to ground as required.
(6) Test the radio receiver antenna. (Refer to 8 -
ELECTRICAL/AUDIO/ANTENNA BODY & CABLE -
DIAGNOSIS AND TESTING). If OK, go to Step 7. If
not OK, replace the faulty antenna or coaxial cable
as required.
(7) Connect the battery negative cable. Turn the
ignition switch to the On position. Check for battery
voltage at the fused ignition switch output (acc/run)
circuit cavity of the 22 pin radio wire harness connec-
tor. If OK, go to Step 8. If not OK, repair the open
fused ignition switch output (acc/run) circuit to the
junction block fuse as required.
(8) Turn the ignition switch to the Off position.
Check for battery voltage at the fused B(+) circuit
cavity of the 22 pin radio wire harness connector. If
OK, replace the faulty radio receiver. If not OK,
repair the open fused B(+) circuit to the junction
block fuse as required.
REMOVAL
WARNING: DISABLE THE AIRBAG SYSTEM
BEFORE ATTEMPTING ANY STEERING WHEEL,
STEERING COLUMN, SEAT BELT TENSIONER, SIDE
AIRBAG, OR INSTRUMENT PANEL COMPONENT
DIAGNOSIS OR SERVICE. DISCONNECT AND ISO-
LATE THE BATTERY NEGATIVE (GROUND) CABLE,
THEN WAIT TWO MINUTES FOR THE AIRBAG SYS-
TEM CAPACITOR TO DISCHARGE BEFORE PER-
FORMING FURTHER DIAGNOSIS OR SERVICE. THIS
IS THE ONLY SURE WAY TO DISABLE THE AIRBAG
SYSTEM. FAILURE TO TAKE THE PROPER PRE-
CAUTIONS COULD RESULT IN ACCIDENTAL AIR-
BAG DEPLOYMENT AND POSSIBLE PERSONAL
INJURY.
(1) Disconnect and isolate the battery negative
cable.
(2) Remove the center upper bezel from the instru-
ment panel.(Refer to 23 - BODY/INSTRUMENT
PANEL - REMOVAL).
(3) Remove the four screws that secure the radio
receiver to the instrument panel (Fig. 12).
WJAUDIO 8A - 17
RADIO (Continued)

LIFTGATE OPENING UPPER
TRIM
REMOVAL
The upper liftgate opening trim is held on with
spring clips.
(1) Grasp the rear of the trim piece and pull down
and back to disengage clips (Fig. 12).
(2) Slide the trim piece to the rear to disengage
headliner locating hooks.
INSTALLATION
The liftgate upper opening trim piece is equipped
with headliner locating hooks (Fig. 13).
(1) Align the locating hooks with the slots in the
headliner.
(2) Engage the spring clips and press the liftgate
upper opening trim panel into place.
QUARTER TRIM PANEL
REMOVAL
(1) Move rear seat to cargo position.
(2) If equipped, remove sunshade cover.
(3) Open liftgate.
(4) Remove upper and lower liftgate opening trim
panels (Refer to 23 - BODY/INTERIOR/LIFTGATE
OPENING UPPER TRIM - REMOVAL).
(5) Remove D-pillar upper trim (Refer to 23 -
BODY/INTERIOR/D-PILLAR TRIM - REMOVAL).
(6) Remove storage bin (right side only) (Refer to
23 - BODY/INTERIOR/REAR STORAGE BOX -
REMOVAL).
(7) Remove C-pillar upper trim panel (Refer to 23 -
BODY/INTERIOR/C-PILLAR TRIM - REMOVAL).
(8) Remove mounting screws.
(9) Pull quarter trim panel forward and disengage
connectors for CD player and power outlet, if
equipped.
(10) Pull quarter trim panel extension in the rear
door opening upward.
(11) Remove rear quarter trim panel.
INSTALLATION
(1) Position quarter trim panel, engage connectors
for CD player and power outlet, if equipped, and
align screw holes.
(2) Install quarter trim panel.
(3) Install C-pillar upper trim panel (Refer to 23 -
BODY/INTERIOR/C-PILLAR TRIM - INSTALLA-
TION).
(4) Install storage bin (Refer to 23 - BODY/INTE-
RIOR/REAR STORAGE BOX - INSTALLATION).
(5) Install D-pillar upper trim panel (Refer to 23 -
BODY/INTERIOR/D-PILLAR TRIM - INSTALLA-
TION).
(6) Install upper and lower liftgate opening trim
panels (Refer to 23 - BODY/INTERIOR/LIFTGATE
OPENING UPPER TRIM - INSTALLATION).
(7) If equipped, install sunshade cover.
(8) Install cargo loops.
(9) Move the rear seat to the upright position.
REAR STORAGE BOX
REMOVAL
(1) Open the storage bin lid and remove screws on
each side of the lid hinge.
(2) Pull upward sharply on the bottom of the bin
to disengage hooks.
(3) Raise bin and move inboard to disengage the
quarter trim panel.
Fig. 12 Upper Liftgate Opening Trim
1 - UPPER LIFTGATE OPENING TRIM
Fig. 13 Headliner Locating Hooks
1 - UPPER LIFTGATE OPENING TRIM
2 - HEADLINER
WJINTERIOR 23 - 79