Jeep Wrangler TJ. Manual — part 272
tery. Disconnect both battery cables, the negative
cable first. Reconnect the battery negative cable and
perform the test as follows:
(1) Connect one ohmmeter test lead to the vehicle
fender. Connect the other test lead to the battery
negative post.
(2) The resistance should be less than one ohm.
(3) If the resistance is more than one ohm, check
the braided ground strap connected to the engine and
the vehicle body for being loose, corroded, or dam-
aged. Repair or replace the ground strap connection,
if required.
TEST 4
Test 4 checks the condition of the ground between
the antenna base and the vehicle body as follows:
(1) Connect one ohmmeter test lead to the vehicle
fender. Connect the other test lead to the outer crimp
on the antenna coaxial cable connector.
(2) The resistance should be less then one ohm.
(3) If the resistance is more then one ohm, clean
and/or tighten the antenna base to fender mounting
hardware.
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 glove box from the instrument
panel. (Refer to 23 - BODY/INSTRUMENT PANEL/
GLOVE BOX - REMOVAL).
(3) Reach through the instrument panel glove box
opening to unplug the two antenna coaxial cables in
line connector. Unplug the connector by pulling it
apart while twisting the metal connector halves. Do
not pull on the cable.
(4) Unscrew the antenna mast from the antenna
body base on the right outer cowl side panel (Fig. 2).
(5) Using a trim stick, gently pry the edge of the
antenna base trim cover to unsnap it from the
antenna body base.
(6) Remove the three screws that secure the
antenna body base to the right outer cowl side panel.
(7) From inside the passenger compartment, push
the coaxial cable grommet on the antenna body half
of the coaxial cable out through the hole in the right
inner cowl side panel.
(8) From the outside of the vehicle, pull the
antenna body base and cable assembly out through
the hole in the right outer cowl side panel.
INSTALLATION
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) From outside the vehicle, feed the antenna
cable and base assembly through the outer cowl side
panel and into the inner cowl side panel hole.
(2) From inside the passenger compartment, pull
the cable and grommet into the hole in the inside
cowl side panel until the grommet is fully seated.
(3) Install the three screws retaining the antenna
body base to right outer cowl side panel. Tighten the
screws to 3.3 N·m (30 in. lbs.).
(4) Snap on the antenna base trim cover to the
antenna body base.
(5) Install antenna mast. Tighten to 5 N·m (46 in.
lbs.). Ensure that the antenna mast is fully
Fig. 2 Antenna Remove/Install
1 - RIGHT COWL SIDE PANEL
2 - BASE & CABLE
3 - GROMMET
4 - SCREW
5 - COVER
6 - MAST
TJ
AUDIO/VIDEO
8A - 5
ANTENNA BODY & CABLE (Continued)
seated on antenna base and that there is no gap
between the mast and base.
(6) Reach through the glove box opening and con-
nect the two antenna coaxial cables in line connector.
(7) Install the glove box to the instrument panel
(Refer to 23 - BODY/INSTRUMENT PANEL/GLOVE
BOX - INSTALLATION).
(8) Connect the battery negative cable.
RADIO
DESCRIPTION
Available factory-installed radio receivers for this
model include:
• AM/FM/cassette with CD changer control fea-
ture (RBB sales code)
• AM/FM/CD with CD changer control feature
(RBK sales code)
• AM/FM/cassette/CD/ with CD changer control
feature (RAD, RBT or RBY sales code) - export only
All factory-installed radio receivers can communi-
cate on the Programmable Communications Interface
(PCI) data bus network. All factory-installed receiv-
ers are stereo Electronically 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.
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.
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 instrument panel top cover from
the instrument panel. (Refer to 23 - BODY/INSTRU-
MENT PANEL/INSTRUMENT PANEL TOP COVER
- REMOVAL).
(3) Remove the center bezel (Refer to 23 - BODY/
INSTRUMENT
PANEL/INSTRUMENT
PANEL
CENTER BEZEL - REMOVAL).
(4) Remove the screws that secure the radio to the
instrument panel.
(5) If the vehicle is equipped with the CD radio, go
to Step 6. If the vehicle is not equipped with the CD
radio receiver, go to Step 8.
(6) Remove the glove box from the instrument
panel. (Refer to 23 - BODY/INSTRUMENT PANEL/
GLOVE BOX - REMOVAL).
(7) Reach through the instrument panel glove box
opening to access and remove the nut that secures
the CD radio bracket and the ground strap to the
back of the radio.
(8) Pull the radio out from the instrument panel
far enough to access the wire harness connectors and
the antenna coaxial cable connector.
(9) Unplug the wire harness connectors from the
rear of the radio.
CAUTION: Pulling the antenna cable straight out of
the radio without pulling on the locking antenna
connector could damage the cable or radio.
(10) Disconnect the antenna cable by pulling the
locking antenna connector away from the radio (Fig.
3).
(11) Remove the radio from the instrument panel.
Fig. 3 ANTENNA TO RADIO
1 - RADIO
2 - LOCKING ANTENNA CONNECTOR
3 - INSTRUMENT PANEL ANTENNA CABLE
8A - 6
AUDIO/VIDEO
TJ
ANTENNA BODY & CABLE (Continued)
INSTALLATION
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) Connect the coaxial antenna cable at the rear
of the radio chassis.
(2) Connect the radio wire harness connectors to
the rear of the radio.
(3) Install the radio to the instrument panel.
(4) If equipped with a CD radio, reach through the
glove box opening and install the nut through the CD
radio bracket stud plate. Ensure that antenna in-line
connector is properly mated and has not become dis-
connected or pinched.
(5) Install glove box.
(6) Install the retaining screws. Tighten the screws
to 5 N·m (20 in. lbs).
(7) Install the center bezel to the instrument panel
(Refer to 23 - BODY/INSTRUMENT PANEL/IN-
STRUMENT PANEL CENTER BEZEL - INSTALLA-
TION).
(8) Connect the battery negative cable.
RADIO NOISE SUPPRESSION
COMPONENTS
DESCRIPTION
Radio Frequency Interference (RFI) and Electro-
Magnetic Interference (EMI) noise suppression is
accomplished primarily through circuitry internal to
the
radio
receivers.
These
internal
suppression
devices are only serviced as part of the radio receiver.
External suppression devices that are used on this
vehicle to control RFI or EMI noise include the fol-
lowing:
• Radio antenna base ground
• Radio receiver chassis ground wire
• Engine-to-body ground strap
• Resistor-type spark plugs
• Radio suppression-type secondary ignition wir-
ing.
DIAGNOSIS AND TESTING - RADIO NOISE
SUPPRESSION COMPONENTS
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.
For complete circuit diagrams, refer to the appro-
priate wiring information. The wiring information
includes wiring diagrams, proper wire and connector
repair procedures, further details on wire harness
routing and retention, as well as pin-out and location
views for the various wire harness connectors, splices
and grounds. Inspect the ground paths and connec-
tions at the following locations:
• Blower motor
• Electric fuel pump
• Engine-to-body ground strap
• Generator
• Ignition module
• Radio antenna base ground
• Radio receiver chassis ground wire or strap
• Wiper motor.
If the source of RFI or EMI noise is identified as a
component on the vehicle (i.e., generator, blower
motor, etc.), the ground path for that component
should be checked. If excessive resistance is found in
any ground circuit, clean, tighten, or repair the
ground circuits or connections to ground as required
before considering any component replacement.
• Ignition coil
• Spark plugs
• Spark plug wire routing and condition.
Reroute the spark plug wires or replace the faulty
components as required.
If the source of the RFI or EMI noise is identified
as two-way mobile radio or telephone equipment,
check the equipment installation for the following:
• Power connections should be made directly to
the battery, and fused as closely to the battery as
possible.
• The antenna should be mounted on the roof or
toward the rear of the vehicle. Remember that mag-
netic antenna mounts on the roof panel can adversely
affect the operation of an overhead console compass,
if the vehicle is so equipped.
• The antenna cable should be fully shielded coax-
ial cable, should be as short as is practical, and
should be routed away from the factory-installed
vehicle wire harnesses whenever possible.
• The antenna and cable must be carefully
matched to ensure a low Standing Wave Ratio
(SWR).
TJ
AUDIO/VIDEO
8A - 7
RADIO (Continued)
REMOVAL
ENGINE-TO-BODY GROUND STRAP
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.
(1) Remove the screw that secures the engine-to-
body ground strap eyelet to the hood panel center
reinforcement.
(2) Remove the screw that secures the engine-to-
body ground strap eyelet to the dash panel.
(3) Remove the nut that secures the engine-to-body
ground strap eyelet to the stud on the left upper rear
corner of the engine cylinder head.
(4) Remove the engine-to-body ground strap eyelet
from the stud on the left upper rear corner of the
engine cylinder head.
(5) Remove the engine-to-body ground strap from
the engine compartment.
INSTALLATION
ENGINE-TO-BODY GROUND STRAP
(1) Position the engine-to-body ground strap in the
engine compartment.
(2) Position the engine-to-body ground strap eyelet
over the stud on the left upper rear corner of the
engine cylinder head.
(3) Install and tighten the nut that secures the
engine-to-body ground strap eyelet to the stud on the
left upper rear corner of the engine cylinder head.
Tighten the nut to 5.6 N·m (50 in. lbs.).
(4) Install and tighten the screw that secures the
engine-to-body ground strap eyelet to the dash panel.
Tighten the screw to 48.5 N·m (430 in. lbs.).
(5) Install and tighten the screw that secures the
engine-to-body ground strap eyelet to the hood panel
center reinforcement. Tighten the screw to 1.9 N·m
(17 in. lbs.).
SPEAKER
DESCRIPTION
The standard equipment speaker system includes
four full-range speakers. The two front speakers are
mounted behind a removable bezel located on each
outboard end of the lower instrument panel. With the
premium speaker system, the standard front speak-
ers are replace with an enclosure assembly that
includes a 4 inch speaker and a 1 inch tweeter. The
two rear speakers are mounted behind a grille
located on each outboard end of the sport bar, above
the rear seating area of the vehicle.
OPERATION
Two wires connected to each speaker, one feed cir-
cuit (+) and one return circuit (–), allow the audio
output signal electrical current to flow through the
speaker voice coil.
DIAGNOSIS AND TESTING - SPEAKER
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:
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 is a
“floating ground” system. Do not allow any speaker
lead to short to ground, as damage to the radio
may result.
8A - 8
AUDIO/VIDEO
TJ
RADIO NOISE SUPPRESSION COMPONENTS (Continued)
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