2003 JEEP GRAND CHEROKEE Electric

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)

SPECIAL TOOLS
AUDIO SYSTEMS
AMPLIFIER
DESCRIPTION
Models equipped with the Infinity premium
speaker package have a separate power amplifier
unit. This power amplifier is rated at 180 watts out-
put. The power amplifier unit is mounted to the rear
floor panel under the passenger side rear seat cush-
ion. The power amplifier unit can be accessed for ser-
vice by unlatching and tilting the passenger side rear
seat cushion forward.
The power amplifier unit should be checked if
there is no sound output noted from the speakers.
For diagnosis of the power amplifier, (Refer to 8 -
ELECTRICAL/AUDIO/SPEAKER - DIAGNOSIS
AND TESTING). The power amplifier cannot be
repaired or adjusted and, if faulty or damaged, the
unit must be replaced.
OPERATION
The power amplifier is energized by a fused 12 volt
output from the radio receiver whenever the radio is
turned on. The power amplifier receives the sound
signal inputs for four speaker channels from the
radio receiver, then sends the amplified speaker out-
puts for each of those channels to the six Infinity
speakers. For complete circuit diagrams, refer to the
appropriate wiring information. The wiring informa-
tion includes wiring diagrams, proper wire and con-
nector repair procedures, details of wire harness
routing and retention, connector pin-out information
and location views for the various wire harness con-
nectors, splices and grounds.
DIAGNOSIS AND TESTING - AMPLIFIER
The power amplifier unit should be checked if
there is no sound output noted from the speakers.
For diagnosis of the power amplifier, (Refer to 8 -
ELECTRICAL/AUDIO/SPEAKER - DIAGNOSIS
AND TESTING). For complete circuit diagrams, refer
to the appropriate wiring information. The wiring
information includes wiring diagrams, proper wire
and connector repair procedures, details of wire har-
ness routing and retention, connector pin-out infor-
mation and location views for the various wire
harness connectors, splices and grounds.
REMOVAL
(1) Disconnect and isolate the battery negative
cable.
(2) Unlatch and lift the right rear seat cushion to
the upright position.
(3) Disconnect the two right body wire harness
connectors from the amplifier (Fig. 1).
(4) Remove the three mounting nuts.
(5) Remove the power amplifier.
INSTALLATION
(1) Position the power amplifier onto the three
floor panel studs.
(2) Install the mounting nuts. Tighten the nuts to
11.8 N´m (105 in. lbs.).
(3) Reconnect the two right body wire harness con-
nectors.
(4) Lower the right rear seat cushion to the floor
panel.
(5) Reconnect the battery negative cable.
Antenna Nut Wrench C-4816
Fig. 1 Power Amplifier Remove/Install
1 - NUT (3)
2 - RIGHT BODY WIRE HARNESS
3 - AMPLIFIER
4 - STUD (3)
5 - RIGHT REAR FLOOR PANEL
8A - 6 AUDIOWJ
AUDIO (Continued)

ANTENNA BODY & CABLE
DESCRIPTION
The antenna body and cable is secured below the
fender panel by the antenna cap nut through a
mounting hole in the of the right front fender (Fig.
2). The primary coaxial antenna cable is then routed
beneath the fender sheet metal and through a entry
hole in the right cowl side panel into the interior of
the vehicle. Inside the vehicle, the primary coaxial
cable is connected to a secondary instrument panel
antenna coaxial cable with an in-line connector that
is located behind the right kick panel. The secondary
coaxial cable is then routed behind the instrument
panel to the back of the radio.
OPERATION
The antenna body and cable connects the antenna
mast to the radio. The radio antenna is an electro-
magnetic circuit component used to capture radio fre-
quency signals that are broadcast by local
commercial radio stations in both the Amplitude
Modulating (AM) and Frequency Modulating (FM)
frequency ranges. These electromagnetic radio fre-
quency signals induce small electrical modulations
into the antenna as they move past the mast. The
antenna body transfers the weak electromagnetic
radio waves induced into the rigid antenna mast into
the center conductor of the flexible primary antenna
coaxial cable. The braided outer shield of the
antenna coaxial cable is grounded through both the
antenna body and the radio chassis, effectively
shielding the radio waves as they are conducted to
the radio. The radio then tunes and amplifies the
weak radio signals into stronger electrical signals in
order to operate the audio system speakers.
DIAGNOSIS AND TESTING - ANTENNA BODY
AND CABLE
The following four tests are used to diagnose the
antenna with an ohmmeter:
²Test 1- Mast to ground test
²Test 2- Tip-of-mast to tip-of-conductor test
²Test 3- Body ground to battery ground test
²Test 4- Body ground to antenna coaxial cable
shield test.
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, DISABLE THE AIRBAG SYSTEM BEFORE
ATTEMPTING ANY STEERING WHEEL, STEERING
COLUMN, 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.
The ohmmeter test lead connections for each test
are shown in the illustration (Fig. 3).
Fig. 2 Antenna Body and Cable
1 - MAST
2 - BODY & CABLE
3 - CAP NUT
4 - ADAPTER
5 - RIGHT FRONT FENDER
WJAUDIO 8A - 7

INSTALLATION
(1) Position the antenna base and lead into the
rear of the right front fender wheel house opening.
(2) Insert the antenna base into the mounting hole
in the top of the right front fender.
(3) Install the antenna escutcheon onto the
antenna base on the top of the right front fender.
(4) Install and tighten the antenna base cap nut
using an antenna nut wrench (Special Tool C-4816).
Tighten the cap nut to 6.8 N´m (60 in. lbs.).
(5) Install the plastic shroud onto the antenna
base cap nut.
(6) Install and tighten the antenna mast onto the
antenna base. Tighten the antenna mast to 3.3 N´m
(30 in. lbs.).
(7) Reach through the rear of the right front
fender wheel house opening to access and insert the
antenna lead coaxial cable and connector into the
passenger compartment through the hole in the right
cowl side outer panel.
(8) From the right front fender wheel house, seat
the antenna lead grommet into the hole in the right
cowl side outer panel.
(9) Install the lower rear half of the inner liner
into the right front fender wheel house.
(10) Reach under the passenger side of the instru-
ment panel near the right cowl side inner panel to
reconnect the antenna coaxial cable connector halves.
(11) Install the trim panel onto the right inner
cowl side.
(12) Install the scuff plate onto the right front door
sill.
(13) Reconnect the battery negative cable.
ANTENNA MODULE - EXPORT
DESCRIPTION
The antenna module (Fig. 7) is an electromagnetic
circuit component designed to capture and enhance
RF (Radio Frequency) signals in both the AM and
FM broadcast bands. The antenna module is
mounted to the right rear roof rail under the head-
liner. The modules mounting brackets also double as
the ground circuit. The module has a two wire elec-
trical connector that connects to the electric backlite
integral radio antenna, located on the right rear
quarter glass, a connector for the radio coax cable
and a connector for battery voltage.
Fig. 5 Antenna Mast Remove/Install - Typical
1 - ANTENNA MAST
2 - ADAPTER
3 - CAP NUT
Fig. 6 Antenna Base Cap Nut Remove/Install -
Typical
1 - CAP NUT
2 - ANTENNA ADAPTER
3 - TOOL
8A - 10 AUDIOWJ
ANTENNA BODY & CABLE (Continued)

The CD changer can only be serviced by an autho-
rized radio repair station. See the latest Warranty
Policies and Procedures manual for a current listing
of authorized radio repair stations.
OPERATION
The CD changer will only operate when the igni-
tion switch is in the On or Accessory positions, and
the radio is turned on. For more information on the
features, loading procedures and radio control func-
tions for the operation of the CD changer, see the
owner's manual in the vehicle glove box.
DIAGNOSIS AND TESTING - CD CHANGER
Following are tests that will help to diagnose the
hard wired components and circuits of the Compact
Disc (CD) changer unit. However, these tests may not
prove conclusive in the diagnosis of this unit. In
order to obtain conclusive testing of the CD changer
unit, the Programmable Communications Interface
(PCI) data bus network, the CD changer unit, the
radio receiver unit and any other electronic modules
that provide inputs to, or receive outputs from the
audio system must be checked.
Any diagnosis of the Audio system should
begin with the use of the DRB IIItdiagnostic
tool. For information on the use of the DRB
IIIt, refer to the appropriate Diagnostic Service
Manual.
Refer to the appropriate 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 connectors, 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.
COMPACT DISC CHANGER INOPERATIVE
(1) Turn the ignition switch to the On position.
Turn the radio receiver on and check its operation. If
OK, go to Step 2. If not OK, (Refer to 8 - ELECTRI-
CAL/AUDIO/RADIO - OPERATION).(2) Turn the ignition switch to the Off position.
Disconnect and isolate the battery negative cable.
Disconnect the right body wire harness connector
from the CD changer connector receptacle. Check for
continuity between the power ground (Z17) circuit of
the right body wire harness connector for the CD
changer and a good ground. There should be continu-
ity. If OK, go to Step 3. If not OK, repair the open
power ground circuit to the radio receiver as
required.
(3) Reconnect the battery negative cable. Check for
battery voltage at the B(+) circuit cavity of the right
body wire harness connector for the CD changer. If
OK, go to Step 4. If not OK, go to Step 5.
(4) Turn the ignition switch to the On position.
Check for battery voltage at the ignition switch out-
put circuit cavity of the right body wire harness con-
nector for the CD changer. If OK, use a DRB scan
tool and the proper Diagnostic Procedures manual for
further diagnosis. If not OK, go to Step 6.
(5) Disconnect and isolate the battery negative
cable. Remove the radio receiver from the instrument
panel. Disconnect the 10 pin cable connector from the
radio receiver, but do not disconnect the other wire
harness connectors. Reconnect the battery negative
cable. Check for battery voltage at the B(+) circuit
cavity of the 10 pin connector receptacle on the radio
receiver. If OK, repair the open B(+) circuit to the CD
changer as required. If not OK, check for a shorted
B(+) circuit to the CD changer and repair as
required, then replace the faulty radio receiver.
(6) Turn the ignition switch to the Off position.
Disconnect and isolate the battery negative cable.
Remove the radio receiver from the instrument
panel. Disconnect the 10 pin cable connector from the
radio receiver, but do not disconnect the other wire
harness connectors. Reconnect the battery negative
cable. Turn the ignition switch to the On position.
Check for battery voltage at the ignition switch out-
put circuit cavity of the 10 pin connector receptacle
on the radio receiver. If OK, repair the open ignition
switch output circuit to the CD changer as required.
If not OK, check for a shorted ignition switch output
circuit to the CD changer and repair as required,
then replace the faulty radio receiver.
NO SOUND OR ONLY ONE CHANNEL SOUND
FROM CD CHANGER
(1) Turn the ignition switch to the On position.
Turn the radio receiver on and check its audio output
operation. If OK, go to Step 2. If not OK, (Refer to 8
- ELECTRICAL/AUDIO/SPEAKER - OPERATION).
(2) Disconnect and isolate the battery negative
cable. Disconnect the right body wire harness connec-
tor from the CD changer connector receptacle.
Remove the radio receiver from the instrument
WJAUDIO 8A - 13
CD CHANGER (Continued)

(2) Install the four mounting nuts. Tighten the
nuts to 12 N´m (105 in. lbs.).
(3) Reconnect the right body wire harness connec-
tor.
(4) Position the compact disc changer storage bin
onto the right side quarter trim panel.
(5) Using both hands push the compact disc
changer storage bin firmly and evenly toward the
right side quarter trim panel far enough to engage
the hooks on the bin with the slots in the panel.
(6) Using both hands push the compact disc
changer storage bin firmly and evenly downward far
enough to align the screw holes in the bin with the
mounting holes in the right side quarter trim panel.
(7) Install the two screws that secure the top of
the compact disc changer storage bin. Tighten the
screws to 1.7 N´m (15 in. lbs.).
(8) Reconnect the battery negative cable.
INSTRUMENT PANEL
ANTENNA CABLE
REMOVAL
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, REFER TO ELECTRICAL, RESTRAINTS
BEFORE ATTEMPTING ANY STEERING WHEEL,
STEERING COLUMN, OR INSTRUMENT PANEL
COMPONENT DIAGNOSIS OR SERVICE. FAILURE
TO TAKE THE PROPER PRECAUTIONS COULD
RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT
AND POSSIBLE PERSONAL INJURY.
(1) Disconnect and isolate the battery negative
cable.
(2) Remove the scuff plate from the right front
door sill. (Refer to 23 - BODY/INTERIOR/DOOR
SILL SCUFF PLATE - REMOVAL) for the proce-
dures.
(3) Remove the trim panel from the right inner
cowl side. (Refer to 23 - BODY/INTERIOR/COWL
TRIM - REMOVAL) for the procedures.
(4) Reach under the passenger side of the instru-
ment panel near the right cowl side inner panel to
disconnect the antenna coaxial cable connector by
pulling it apart while twisting the metal connector
halves. Do not pull on the cable.
(5) Disengage the antenna cable retainer from the
mounting hole in the wire harness mounting tab
under the passenger side end of the instrument
panel.
(6) Remove the radio receiver from the instrument
panel. (Refer to 8 - ELECTRICAL/AUDIO/RADIO -
REMOVAL) for the procedures.(7) Remove the passenger side airbag module from
the instrument panel. (Refer to 8 - ELECTRICAL/
RESTRAINTS/PASSENGER AIRBAG - REMOVAL)
for the procedures.
(8) Disengage the antenna cable retainer from the
mounting hole in the top of the radio mount on the
instrument panel structural duct (Fig. 11).
(9) Disengage the antenna cable from the locator
tabs on the top of the instrument panel structural
duct above the glove box opening.
(10) Remove the antenna cable from the instru-
ment panel.
INSTALLATION
(1) Position the antenna cable onto the instrument
panel.
(2) Engage the antenna cable with the locator tabs
on the top of the instrument panel structural duct
above the glove box opening.
(3) Engage the antenna cable retainer into the
mounting hole in the top of the radio mount on the
instrument panel structural duct.
(4) Install the passenger side airbag module onto
the instrument panel. (Refer to 8 - ELECTRICAL/
RESTRAINTS/PASSENGER AIRBAG - INSTALLA-
TION) for the procedures.
(5) Install the radio receiver onto the instrument
panel. (Refer to 8 - ELECTRICAL/AUDIO/RADIO -
INSTALLATION) for the procedures.
(6) Engage the antenna cable retainer into the
mounting hole in the wire harness mounting tab
under the passenger side end of the instrument
panel.
Fig. 11 Instrument Panel Antenna Cable Routing
1 - INSTRUMENT PANEL STRUCTURAL DUCT
2 - RETAINER
3 - COAXIAL CABLE
4 - COAXIAL CABLE CONNECTORS
WJAUDIO 8A - 15
CD CHANGER (Continued)

(7) Reach under the passenger side of the instru-
ment panel near the right cowl side inner panel to
reconnect the antenna coaxial cable connector halves.
(8) Install the trim panel onto the right inner cowl
side. (Refer to 23 - BODY/INTERIOR/COWL TRIM -
INSTALLATION) for the procedures.
(9) Install the scuff plate onto the right front door
sill. (Refer to 23 - BODY/INTERIOR/DOOR SILL
SCUFF PLATE - INSTALLATION) for the proce-
dures.
(10) Reconnect the battery negative cable.
QUARTER GLASS INTEGRAL
ANTENNA - EXPORT
DESCRIPTION
The integral radio antenna element is bonded to
the right rear quarter glass and is replaced with the
glass assembly only.
OPERATION
The integral antenna receives RF (Radio Frequen-
cies) and sends them to the antenna module for
amplification.
DIAGNOSIS AND TESTING - QUARTER GLASS
INTEGRAL ANTENNA - EXPORT
For complete circuit diagrams, refer to the Appro-
priate Wiring Information. To detect breaks in the
integral antenna elements, the following procedure is
required:
(1) Disconnect the antenna module connector from
the antenna.
(2) Using a Ohmmeter, place both leads onto the
connector pins on the integral antenna. If continuity
is present antenna grid is Okay. If continuity is not
present move one lead through the grid in progres-
sion until continuity is detected. A break in the
antenna grid can be repaired using a Mopar Rear
Window Defogger Repair Kit (Part Number 4267922)
or equivalent. (Refer to 8 - ELECTRICAL/WINDOW
DEFOGGER/REAR WINDOW DEFOGGER GRID -
STANDARD PROCEDURE)
RADIO
DESCRIPTION
Available factory-installed radio receivers for this
model include an AM/FM/cassette with CD changer
control feature (RBB sales code), an AM/FM/CD/2-
band graphic equalizer with CD changer control fea-
ture (RBK sales code), or an AM/FM/CD/cassette/2-
band graphic equalizer (RBP sales code). All factory-
installed radio receivers can communicate on theProgrammable Communications Interface (PCI) data
bus network through a separate wire harness connec-
tor. All factory-installed receivers are stereo Electron-
ically Tuned Radios (ETR) and include an electronic
digital clock function.
These radio receivers can only be serviced by an
authorized radio repair station. See the latest War-
ranty Policies and Procedures manual for a current
listing of authorized radio repair stations.
All vehicles are equipped with an Ignition-Off
Draw (IOD) fuse that is removed when the vehicle is
shipped from the factory. This fuse feeds various
accessories that require battery current when the
ignition switch is in the Off position, including the
clock. The IOD fuse is removed to prevent battery
discharge during vehicle storage.
When removing or installing the IOD fuse, it is
important that the ignition switch be in the Off posi-
tion. Failure to place the ignition switch in the Off
position can cause the radio display to become scram-
bled when the IOD fuse is removed and replaced.
Removing and replacing the IOD fuse again, with the
ignition switch in the Off position, will correct the
scrambled display condition.
The IOD fuse should be checked if the radio or
clock displays are inoperative. The IOD fuse is
located in the Power Distribution Center (PDC).
Refer to the fuse layout label on the underside of the
PDC cover for IOD fuse identification and location.
OPERATION
The radio receiver operates on ignition switched
battery current that is available only when the igni-
tion switch is in the On or Accessory positions. The
electronic digital clock function of the radio operates
on fused battery current supplied through the IOD
fuse, regardless of the ignition switch position.
For more information on the features, setting pro-
cedures, and control functions for each of the avail-
able factory-installed radio receivers, refer to the
owner's manual. For complete circuit diagrams, refer
to the appropriate wiring information. The wiring
information includes wiring diagrams, proper wire
and connector repair procedures, details of wire har-
ness routing and retention, connector pin-out infor-
mation and location views for the various wire
harness connectors, splices and grounds.
DIAGNOSIS AND TESTING - RADIO
Any diagnosis of the Audio system should
begin with the use of the DRB IIItdiagnostic
tool. For information on the use of the DRB
IIIt, refer to the appropriate Diagnostic Service
Manual.
If the vehicle is equipped with the optional remote
radio switches located on the steering wheel and the
8A - 16 AUDIOWJ
INSTRUMENT PANEL ANTENNA CABLE (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)