Jeep Wrangler TJ. Manual — part 271
AUDIO/VIDEO
TABLE OF CONTENTS
page
page
AUDIO
. . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
AMPLIFIED SUBWOOFER
. . . . . . . . . . . . . . . . . . . . . . . . . . 3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
DIAGNOSIS AND TESTING - AMPLIFIED
. . . . . . . . . . . . . . . . . . . . . . . . . 3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
. . . . . . . . . . . . . . . . . . . . . . . . . . 3
ANTENNA BODY & CABLE
. . . . . . . . . . . . . . . . . . . . . . . . . . 4
DIAGNOSIS AND TESTING - ANTENNA BODY
. . . . . . . . . . . . . . . . . . . . . . . . . . 4
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
. . . . . . . . . . . . . . . . . . . . . . . . . . 5
RADIO
. . . . . . . . . . . . . . . . . . . . . . . . . . 6
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
. . . . . . . . . . . . . . . . . . . . . . . . . . 7
RADIO NOISE SUPPRESSION COMPONENTS
. . . . . . . . . . . . . . . . . . . . . . . . . . 7
DIAGNOSIS AND TESTING - RADIO NOISE
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
. . . . . . . . . . . . . . . . . . . . . . . . . . 8
SPEAKER
. . . . . . . . . . . . . . . . . . . . . . . . . . 8
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
DIAGNOSIS AND TESTING - SPEAKER
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
. . . . . . . . . . . . . . . . . . . . . . . . . 10
AUDIO
DESCRIPTION
Several
combinations
of
radio
receivers
and
speaker systems are offered.
The audio system includes the following compo-
nents:
• Amplified sub woofer (if equipped)
• Antenna
• Radio noise suppression components
• Radio receiver
• Speakers
Certain functions and features of the audio system
rely upon resources shared with other electronic
modules in the vehicle over the Programmable Com-
munication Interface (PCI) bus network. The data
bus network allows the sharing of sensor informa-
tion. For diagnosis of these electronic modules or of
the data bus network, the use of a DRB III
t scan tool
and the proper Diagnostic Procedures manual are
recommended.
OPERATION
The audio system components are designed to pro-
vide audio entertainment and information through
the reception, tuning and amplification of locally
broadcast radio signals in both the Amplitude Modu-
lating (AM) and Frequency Modulating (FM) com-
mercial frequency ranges.
The audio system components operate on battery
current received through a fuse in the Junction Block
(JB) on a fused ignition switch output (run-acc) cir-
cuit so that the system will only operate when the
ignition switch is in the Run or Accessory positions.
DIAGNOSIS AND TESTING - AUDIO
Any diagnosis of the Audio system should
begin with the use of the DRB III
t diagnostic
tool. For information on the use of the DRB
III
t, refer to the appropriate Diagnostic Service
Manual.
For complete circuit diagrams, refer to the appro-
priate wiring information.
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.
TJ
AUDIO/VIDEO
8A - 1
Audio System Diagnosis
CONDITION
POSSIBLE CAUSE
CORRECTION
NO AUDIO.
1. Fuse inoperative.
1. Check radio fuse and Ignition-Off Draw fuse in Power
Distribution Center. Replace fuses, if required.
2. Radio connector
damaged.
2. Check for loose or corroded radio connector. Repair, if
required.
3. Wiring damaged.
3. Check for battery voltage at radio connector. Repair wiring, if
required.
4. Ground damaged.
4. Check for continuity between radio chassis and a known good
ground. There should be continuity. Repair ground, if required.
5. Radio inoperative.
5. Exchange or replace radio, if required.
6. Speakers inoperative.
6. Refer to speaker diagnosis.
NO DISPLAY.
1. Fuse inoperative.
1. Check radio fuse and Ignition-Off Draw fuse in Power
Distribution Center. Replace fuses, if required.
2. Radio connector
damaged.
2. Check for loose or corroded radio connector. Repair, if
required.
3. Wiring damaged.
3. Check for battery voltage at radio connector. Repair wiring, if
required.
4. Ground damaged.
4. Check for continuity between radio chassis and a known good
ground. There should be continuity. Repair ground, if required.
5. Radio inoperative.
5. Exchange or replace radio, if required.
CLOCK WILL
NOT KEEP SET
TIME.
1. Fuse inoperative.
1. Check ignition-off draw fuse. Replace fuse, if required.
2. Radio connector
damaged.
2. Check for loose or corroded radio connector. Repair, if
required.
3. Wiring damaged.
3. Check for battery voltage at radio connector. Repair wiring, if
required.
4. Ground damaged.
4. Check for continuity between radio chassis and a known good
ground. There should be continuity. Repair ground, if required.
5. Radio inoperative.
5. Exchange or replace radio, if required.
POOR RADIO
RECEPTION.
1. Antenna inoperative.
1. See antenna diagnosis, in this group. Repair or replace
antenna, if required.
2. Ground damaged.
2. Check for continuity between radio chassis and a known good
ground. There should be continuity. Repair ground, if required..
3. Radio inoperative.
3. Exchange or replace radio, if required.
NO/POOR TAPE
OPERATION.
1. Tape damaged.
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. Radio inoperative
4. Exchange or replace radio, if required.
8A - 2
AUDIO/VIDEO
TJ
AUDIO (Continued)
Audio System Diagnosis
CONDITION
POSSIBLE CAUSE
CORRECTION
NO COMPACT
DISC
OPERATION
1. CD damaged.
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. Radio inoperative
4. Exchange or replace radio, if required.
AMPLIFIED SUBWOOFER
DESCRIPTION
The available amplified subwoofer is mounted
within the center console. The amplified subwoofer is
rated at 80 watts. The amplified subwoofer should be
checked if there is no bass output noted from the
center console speaker. The amplified subwoofer can
not be repaired or adjusted, and if faulty or damaged,
the unit must be replaced.
OPERATION
The amplified subwoofer provides low frequency
bass and receives inputs from the front and rear
speaker circuits.
DIAGNOSIS AND TESTING - AMPLIFIED
SUBWOOFER
Any diagnosis of the Audio system should
begin with the use of the DRB III
t diagnostic
tool. For information on the use of the DRB
III
t, refer to the appropriate Diagnostic Service
Manual.
For complete circuit diagrams, refer to the appro-
priate wiring information.
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.
CAUTION: The speaker output of the radio is a
“floating ground” system. Do not allow any speaker
lead to short to ground, as damage to the radio
may result.
(1) Turn the ignition switch to the On position.
Turn the radio receiver on. Adjust the balance and
fader controls to check the performance of each indi-
vidual speaker. Note the speaker locations that are
not performing correctly.
(2) Disconnect the wire harness connector from the
amplified subwoofer. Turn the ignition switch to the
ON position. Turn the radio ON. Check the radio
choke relay wire harness connector. If not OK, repair
shorted or open wires as necessary. If OK, go to
(STEP #3).
(3) Turn the radio off. Turn the ignition switch to
the Off position. Disconnect and isolate the battery
negative cable. Remove the radio and the amplified
subwoofer. Check both the speaker feed (+) circuit
and return (–) circuit cavities for the inoperative
speaker location(s) from the radio wire harness con-
nectors and to the amplified subwoofer for continuity.
In each case, there should be continuity. If not OK,
repair the shorted speaker feed (+) and/or return (–)
circuit(s) to the speaker as required. If OK, replace
the amplified subwoofer.
REMOVAL
(1) Disconnect and isolate the battery negative
cable.
(2) Remove the center console (Refer to 23 -
BODY/INTERIOR/CENTER
CONSOLE
-
REMOVAL).
(3) Disconnect wire harness retainer.
(4) Disconnect wire harness connector.
(5) Remove the mounting screws from the side of
the console.
(6) Open console lid and remove the retaining fas-
teners from the console.
(7) Remove amplified subwoofer from console.
INSTALLATION
(1) Install amplified subwoofer to console.
(2) Install retaining fasteners to the top of the con-
sole.
TJ
AUDIO/VIDEO
8A - 3
AUDIO (Continued)
(3) Install the mounting screws to the side of the
console.
(4) Connect wire harness connector and retainer.
(5) Install the center console (Refer to 23 - BODY/
INTERIOR/CENTER CONSOLE - INSTALLATION).
(6) Connect the battery negative cable.
ANTENNA BODY & CABLE
DESCRIPTION
All models use a fixed-length stainless steel rod-
type antenna mast, installed on the right front cowl
side panel of the vehicle. The antenna mast is con-
nected to the center wire of the coaxial antenna
cable, and is not grounded to any part of the vehicle.
To eliminate static, the antenna base must have a
good ground. The antenna coaxial cable shield (the
outer wire mesh of the cable) is grounded to the
antenna base and the radio chassis.
The antenna coaxial cable has an additional dis-
connect, located behind the right end of the instru-
ment panel between the radio and the right cowl side
panel. This additional disconnect allows the instru-
ment panel assembly to be removed and installed
without removing the radio.
DIAGNOSIS AND TESTING - ANTENNA BODY
AND CABLE
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.
The following four tests are used to diagnose the
antenna with an ohmmeter:
• Test 1 - Mast to ground test
• Test 2 - Tip-of-mast to tip-of-conductor test
• Test 3 - Body ground to battery ground test
• Test 4 - Body ground to coaxial shield test.
The ohmmeter test lead connections for each test
are shown in Antenna Tests (Fig. 1).
NOTE: This model has a two-piece antenna coaxial
cable. Tests 2 and 4 must be conducted in two
steps to isolate an antenna cable problem. First,
test the primary antenna cable (integral to the
antenna body and cable) from the coaxial cable
connector behind the right side of the instrument
panel between the radio and the right side cowl
panel, to the antenna body. Then, test the second-
ary antenna cable (instrument panel antenna cable)
from the coaxial connector behind the right side of
the instrument panel between the radio and the
right side cowl panel, to the coaxial cable connec-
tor at the radio.
TEST 1
Test 1 determines if the antenna mast is insulated
from the base. Proceed as follows:
(1) Unplug the antenna coaxial cable connector
from the radio chassis and isolate.
(2) Connect one ohmmeter test lead to the tip of
the antenna mast. Connect the other test lead to the
antenna base. Check for continuity.
(3) There should be no continuity. If continuity is
found, replace the faulty or damaged antenna base
and cable assembly.
TEST 2
Test 2 checks the antenna for an open circuit as
follows:
(1) Unplug the antenna coaxial cable connector
from the radio chassis.
(2) Connect one ohmmeter test lead to the tip of
the antenna mast. Connect the other test lead to the
center pin of the antenna coaxial cable connector.
(3) Continuity should exist (the ohmmeter should
only register a fraction of an ohm). High or infinite
resistance indicates damage to the base and cable
assembly. Replace the faulty base and cable, if
required.
TEST 3
Test 3 checks the condition of the vehicle body
ground connection. This test should be performed
with the battery positive cable removed from the bat-
Fig. 1 Antenna Tests
8A - 4
AUDIO/VIDEO
TJ
AMPLIFIED SUBWOOFER (Continued)
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