Dodge Factory Audio 2003 Service Manual

DR AUDIO 8A - 1

AUDIO

TABLE OF CONTENTS

page page

AUDIO

DESCRIPTION ..........................1

OPERATION ............................1

DIAGNOSIS AND TESTING - AUDIO ..........2

AMPLIFIER

DESCRIPTION ..........................3

OPERATION ............................3

REMOVAL .............................3

INSTALLATION ..........................4

ANTENNA BODY & CABLE

DESCRIPTION ..........................4

OPERATION ............................4

DIAGNOSIS AND TESTING - ANTENNA BODY

AND CABLE ..........................4

REMOVAL .............................6

INSTALLATION ..........................6

INSTRUMENT PANEL ANTENNA CABLE

REMOVAL .............................6

INSTALLATION ..........................7

RADIO

DESCRIPTION ..........................7

AUDIO

DESCRIPTION

An audio system is standard factory-installed
equipment on this model. Several combinations of
radio receivers and speaker systems are offered. The
audio system uses an ignition switched source of bat­tery current so that the system will only operate
when the ignition switch is in the RUN or ACCES­SORY positions.

The audio system includes the following compo­nents:

• Antenna

• Power amplifier (with premium speaker system

only)

• Radio noise suppression components

• Radio receiver

• Remote radio switches (if equipped)

• Speakers

Certain functions and features of the audio system
rely upon resources shared with other electronic
modules in the vehicle over the Programmable Com­munication Interface (PCI) bus network. The data
bus network allows the sharing of sensor informa­tion. For diagnosis of these electronic modules or of
the data bus network, the use of a DRB IIIt scan tool

OPERATION ............................7

REMOVAL .............................7

INSTALLATION ..........................8

RADIO NOISE SUPPRESSION GROUND STRAP

DESCRIPTION ..........................8

OPERATION ............................8

REMOVAL .............................9

INSTALLATION .........................10

REMOTE SWITCHES

DESCRIPTION .........................10

OPERATION ...........................10

DIAGNOSIS AND TESTING - REMOTE

SWITCHES ..........................11

REMOVAL .............................12

INSTALLATION .........................12

SPEAKER

DESCRIPTION .........................12

OPERATION ...........................12

DIAGNOSIS AND TESTING - SPEAKER ......13

REMOVAL .............................13

INSTALLATION .........................15

and the proper Diagnostic Procedures manual are
recommended.

Refer to the appropriate wiring information for
complete standard and premium audio system circuit
diagrams. The wiring information includes 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.

OPERATION

The audio system components are designed to pro­vide audio entertainment and information through
the reception, tuning and amplification of locally
broadcast radio signals in both the Amplitude Modu­lating (AM) and Frequency Modulating (FM) com­mercial frequency ranges.

The audio system components operate on battery
current received through a fuse in the Integrated
Power Module (IPM) on a fused ignition switch out­put (run-acc) circuit so that the system will only
operate when the ignition switch is in the Run or
Accessory positions.

On vehicles that are equipped with the optional
remote radio switches, the Instrument Cluster
receives hard wired resistor multiplexed inputs from
the remote radio switches. The programming in the

8A - 2 AUDIO DR

AUDIO (Continued)

Instrument Cluster allows it to process those inputs
and send the proper messages to the radio receiver
over the Programmable Communication Interface
(PCI) bus network to control the radio volume up or
down, station seek up or down, preset station
advance, and mode advance functions.

Refer to the owner’s manual for more information
on the features, use and operation of each of the
available audio systems.

DIAGNOSIS AND TESTING - AUDIO

Any diagnosis of the Audio system should
begin with the use of the DRB IIIt diagnostic
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 ISO­LATE THE BATTERY NEGATIVE (GROUND) CABLE,
THEN WAIT TWO MINUTES FOR THE AIRBAG SYS­TEM CAPACITOR TO DISCHARGE BEFORE PER­FORMING FURTHER DIAGNOSIS OR SERVICE. THIS
IS THE ONLY SURE WAY TO DISABLE THE AIRBAG
SYSTEM. FAILURE TO TAKE THE PROPER PRE­CAUTIONS COULD RESULT IN ACCIDENTAL AIR­BAG DEPLOYMENT AND POSSIBLE PERSONAL
INJURY.

AUDIO SYSTEM DIAGNOSIS TABLE

CONDITION POSSIBLE CAUSES CORRECTION

NO AUDIO 1. Fuse faulty. 1. Check radio fuse and Ignition-Off Draw (IOD)

fuse in the Integrated Power Module (IPM).
Replace fuses, if required.

2. Radio/amplifier (if
equipped) connector faulty.

3. Wiring faulty. 3. Check for shorted or open wires. Repair wiring,

4. Radio/amplifier (if
equipped) ground faulty.

5. Radio/amplifier (if
equipped) faulty.

6. Speakers faulty. 6. Replace speaker as necessary.

NO RADIO DISPLAY 1. Fuse faulty. 1. Check radio fuse and Ignition-Off Draw (IOD)

2. Radio connector faulty. 2. Check for loose or corroded radio connector.

3. Wiring faulty. 3. Check for battery voltage at radio connector.

4. Radio ground faulty. 4. Check for continuity between radio chassis and

5. Radio faulty. 5. Refer to appropriate Diagnostic Service

2. Check for loose or corroded radio/amplifier
connector. Repair, if required.

if required.

4. Check for continuity between radio chassis and
a known good ground. There should be
continuity. Repair ground, if required.

5. Refer to appropriate Diagnostic Service
Manual.

fuse in Integrated Power Module (IPM). Replace
fuses, if required.

Repair, if required.

Repair wiring, if required.

a known good ground. There should be
continuity. Repair ground, if required.

Manual.

DR AUDIO 8A - 3

AUDIO (Continued)

CONDITION POSSIBLE CAUSES CORRECTION

CLOCK WILL NOT KEEP
SET TIME

POOR RADIO RECEPTION 1. Antenna faulty. 1. (Refer to 8 - ELECTRICAL/AUDIO/ANTENNA

NO/POOR TAPE
OPERATION

NO COMPACT DISC
OPERATION

1. Fuse faulty. 1. Check Ignition-Off Draw (IOD) fuse in the
Integrated Power Module (IPM). Replace fuse, if
required.

2. Radio connector faulty. 2. Check for loose or corroded radio connector.
Repair, if required.

3. Wiring faulty. 3. Check for battery voltage at radio connector.
Repair wiring, if required.

4. Radio ground faulty. 4. Check for continuity between radio chassis and
a known good ground. There should be
continuity. Repair ground, if required.

5. Radio faulty. 5. Refer to appropriate Diagnostic Service
Manual.

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.

4. Radio faulty. 4. Refer to appropriate Diagnostic Service

1. Faulty tape. 1. Insert known good tape and test operation.

2. Foreign objects behind

tape door.

3. Dirty cassette tape head. 3. Clean head with Mopar Cassette Head

4. Faulty tape deck. 4. Exchange or replace radio, if required.

1. 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.

4. Faulty CD player. 4. Refer to appropriate Diagnostic Service

3. Repair or replace ground strap as necessary.

Manual.

2. Remove foreign objects and test operation.

Cleaner.

3. Allow temperature of vehicle interior to stabilize
and test operation.

Manual.

AMPLIFIER

DESCRIPTION

The optional Infinity premium speaker system
includes a separate Infinity audio power amplifier.
The amplifier is a six channel unit and is rated at
240 total output watts. The amplifier is located
behind the glove box.

OPERATION

The power amplifier electronically increases the
frequency response of the normal audio signal output
from the radio amplifier in order to improve the
acoustic performance of the speakers. On vehicles

equipped with an amplifier, the amplifier section of
the radio becomes a pre-amplifier.

The amplifier receives audio signal inputs for
speaker channels from the radio, then sends ampli­fied audio outputs through six separate channels
with dedicated feed and return circuits to the indi­vidual speakers.

REMOVAL

(1) Disconnect and isolate the battery negative
cable.

(2) Remove glove box (Refer to 23 - BODY/IN­STRUMENT PANEL/GLOVE BOX - REMOVAL).

8A - 4 AUDIO DR

AMPLIFIER (Continued)

(3) Remove instrument panel center bezel (Refer to
23 - BODY/INSTRUMENT PANEL/INSTRUMENT
PANEL CENTER BEZEL - REMOVAL).

(4) Remove instrument panel lower right center
bezel (Refer to 23 - BODY/INSTRUMENT PANEL/IP
LOWER RIGHT CENTER BEZEL - REMOVAL).

(5) Disconnect electrical harness connector from
amplifier (Fig. 1).

Fig. 1 AMPLIFIER MOUNTING

1 - INSTRUMENT PANEL
2 - AMPLIFIER
3 - MOUNTING BOLTS
4 - ELECTRICAL CONNECTOR

(6) Remove mounting bolts.

INSTALLATION

(1) Connect electrical harness connector and
install amplifier.

(2) Install mounting bolts. Tighten to 10 N·m (90
in. lbs.).

(3) Install instrument panel lower right center
bezel (Refer to 23 - BODY/INSTRUMENT PANEL/IP
LOWER RIGHT CENTER BEZEL - INSTALLA­TION).

(4) Install instrument panel center bezel (Refer to
23 - BODY/INSTRUMENT PANEL/INSTRUMENT
PANEL CENTER BEZEL - INSTALLATION).

(5) Install glove box (Refer to 23 - BODY/INSTRU­MENT PANEL/GLOVE BOX - INSTALLATION).

(6) Connect battery negative cable.

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 right front fender. 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 electro­magnetic circuit component used to capture radio fre­quency signals that are broadcast by local
commercial radio stations in both the Amplitude
Modulating (AM) and Frequency Modulating (FM)
frequency ranges. These electromagnetic radio fre­quency 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:

• 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 antenna coaxial cable

shield test.

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 ISO­LATE THE BATTERY NEGATIVE (GROUND) CABLE,
THEN WAIT TWO MINUTES FOR THE AIRBAG SYS­TEM CAPACITOR TO DISCHARGE BEFORE PER­FORMING FURTHER DIAGNOSIS OR SERVICE. THIS
IS THE ONLY SURE WAY TO DISABLE THE AIRBAG
SYSTEM. FAILURE TO TAKE THE PROPER PRE­CAUTIONS COULD RESULT IN ACCIDENTAL AIR­BAG DEPLOYMENT AND POSSIBLE PERSONAL
INJURY.

The ohmmeter test lead connections for each test
are shown in the illustration (Fig. 2).

DR AUDIO 8A - 5

ANTENNA BODY & CABLE (Continued)

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 kick panel to the
antenna body. Then, test the secondary antenna
cable (instrument panel antenna cable) from the
coaxial cable connector behind the right side kick
panel to the coaxial cable connector at the radio.

Fig. 2 Antenna Tests - Typical

TEST 1

Test 1 determines if the antenna mast is insulated

from ground. Proceed as follows:

(1) Disconnect and isolate the antenna coaxial

cable connector behind the right side kick panel.

(2) Touch one ohmmeter test lead to the tip of the
antenna mast. Touch the other test lead to known
ground. Check the ohmmeter reading for continuity.

(3) There should be no continuity. If OK, go to Test

2. If not OK, replace the faulty antenna body and
cable.

TEST 2

Test 2 checks the antenna conductor components
for an open circuit. This test should be performed
first on the entire antenna circuit, from the antenna
mast to the center conductor of the coaxial cable con­nector at the radio. If an open circuit is detected,
each of the three antenna conductor components
(antenna mast, antenna body and cable, instrument
panel antenna cable) should be isolated and tested
individually to locate the exact component that is the
source of the open circuit. To begin this test, proceed
as follows:

(1) Disconnect the instrument panel antenna cable

coaxial connector from the back of the radio.

(2) Touch one ohmmeter test lead to the tip of the
antenna mast. Touch the other test lead to the center
conductor pin of the instrument panel antenna cable
coaxial connector for the radio. Check the ohmmeter
reading for continuity.

(3) There should be continuity. The ohmmeter
should register only a fraction of an ohm resistance.
High or infinite resistance indicates a damaged or
open antenna conductor. If OK, go to Test 3. If not
OK, isolate and test each of the individual antenna
conductor components. Replace only the faulty
antenna conductor component.

TEST 3

Test 3 checks the condition of the vehicle body
ground connection. To begin this test, proceed as fol­lows:

(1) This test must be performed with the battery
positive cable disconnected from the battery. Discon­nect and isolate both battery cables, negative cable
first.

(2) Reconnect the battery negative cable.

(3) Touch one ohmmeter test lead to a good clean
ground point on the vehicle fender. Touch the other
test lead to the battery negative terminal post. Check
the ohmmeter reading for continuity.

(4) There should be continuity. The ohmmeter
should register less than one ohm resistance. High or
infinite resistance indicates a loose, corroded, or
damaged connection between the battery negative
terminal and the vehicle body. If OK, go to Test 4. If
not OK, check the battery negative cable connection
to the vehicle body and the radio noise suppression
ground strap connections to the engine and the vehi­cle body for being loose or corroded. Clean or tighten
these connections as required.

TEST 4

Test 4 checks the condition of the connection
between the antenna coaxial cable shield and the
vehicle body ground as follows:

(1) Disconnect and isolate the antenna coaxial
cable connector behind the right side kick panel.

(2) Touch one ohmmeter test lead to a good clean
ground point on the vehicle fender. Touch the other
test lead to the outer crimp on the antenna coaxial
cable connector. Check the ohmmeter reading for con­tinuity.

(3) There should be continuity. The ohmmeter
should register less than one ohm resistance. High or
infinite resistance indicates a loose, corroded, or
damaged connection between the antenna body and
the vehicle body or between the antenna body and
the antenna coaxial cable shield. If not OK, clean the

8A - 6 AUDIO DR

ANTENNA BODY & CABLE (Continued)

antenna body to fender mating surfaces and tighten
the antenna cap nut to specifications.

(4) Check the resistance again with an ohmmeter.
If the resistance is still more then one ohm, replace
the faulty antenna body and cable.

REMOVAL

(1) Disconnect and isolate the battery negative
cable.

(2) Remove the right side kick panel.

(3) Disconnect antenna body cable from instru­ment panel cable.

(4) Securely tie a suitable length of cord or twine
to the antenna half of the coaxial cable connector.
This cord will be used to pull the cable back into
position during installation.

(5) Remove the antenna mast.

(6) Remove the antenna cap nut using an antenna
nut wrench (Special Tool C-4816) (Fig. 3).

(6) Install the antenna cap nut. Tighten to 7 N·m

(65 in. lbs.).

(7) Install the antenna mast.
(8) Connect the battery negative cable.

INSTRUMENT PANEL
ANTENNA CABLE

REMOVAL

(1) Disconnect and isolate the battery negative

cable.

(2) Remove the glove box (Refer to 23 - BODY/IN-

STRUMENT PANEL/GLOVE BOX - REMOVAL).

(3) Remove the instrument panel center bezel
(Refer to 23 - BODY/INSTRUMENT PANEL/IN­STRUMENT PANEL CENTER BEZEL - REMOVAL).

(4) Remove the instrument panel lower right cen­ter bezel (Refer to 23 - BODY/INSTRUMENT PAN­EL/IP LOWER RIGHT CENTER BEZEL ­REMOVAL).

(5) Remove the radio (Refer to 8 - ELECTRICAL/
AUDIO/RADIO - REMOVAL).

Fig. 3 ANTENNA BODY AND CABLE

1 - NUT
2 - FENDER
3 - ANTENNA BODY AND CABLE
4 - ADAPTER

(7) Remove the antenna adapter.

(8) With the right door open, pull the antenna
body assembly out through the opening between the
fender and body.

INSTALLATION

(1) Tie the cord that was used during the removal
procedure to the cable being installed.

(2) Using the cord, pull the antenna cable through
the hole in the door opening and seat grommet into
place.

(3) Connect the antenna body and cable to the
instrument panel cable.

(4) Install the right side kick panel.

(5) Insert the antenna body through the hole in
the fender and install adapter.

CAUTION: Pulling the antenna cable straight out of
the radio without pulling on the locking antenna
connector could damage the cable or radio.

(6) Disconnect the antenna cable by pulling the

locking antenna connector away from the radio (Fig.

4)

Fig. 4 ANTENNA TO RADIO

1 - RADIO
2 - LOCKING ANTENNA CONNECTOR
3 - INSTRUMENT PANELANTENNACABLE

(7) Remove antenna cable from instrument panel

by pulling on retaining fasteners (Fig. 5).

DR AUDIO 8A - 7

INSTRUMENT PANEL ANTENNA CABLE (Continued)

(PCI) data bus network. All factory-installed receiv­ers 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 War­ranty 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 igni­tion 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-

Fig. 5 INSTRUMENT PANEL ANTENNA CABLE

1 - INSTRUMENT PANELANTENNACABLE
2 - ANTENNA BODY AND CABLE

cedures, and control functions for each of the avail­able factory-installed radio receivers, refer to the
owner’s manual.

INSTALLATION

(1) Install antenna cable to instrument panel by

pressing retaining fasteners into position.

(2) Connect instrument panel antenna cable to

antenna body and cable.

(3) Install radio (Refer to 8 - ELECTRICAL/AU-

DIO/RADIO - INSTALLATION).

(4) Install the instrument panel lower right center
bezel (Refer to 23 - BODY/INSTRUMENT PANEL/IP
LOWER RIGHT CENTER BEZEL - INSTALLA­TION).

(5) Install the instrument panel center bezel (Refer
to 23 - BODY/INSTRUMENT PANEL/INSTRUMENT
PANEL CENTER BEZEL - INSTALLATION).

(6) Install the glove box (Refer to 23 - BODY/IN­STRUMENT PANEL/GLOVE BOX - INSTALLA­TION).

(7) 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/cassette/CD/graphic equalizer with CD

changer control feature (RAZ sales code)

• AM/FM/CD with CD changer control feature

(RBK sales code)

• AM/FM/CD with 6 CD changer (RBQ sales code)

• AM/FM/cassette/CD (RBY sales code) - export

only

All factory-installed radio receivers can communi­cate on the Programmable Communications Interface

REMOVAL

(1) Disconnect and isolate the battery negative

cable.

(2) Remove center instrument panel bezel (Refer to
23 - BODY/INSTRUMENT PANEL/INSTRUMENT
PANEL CENTER BEZEL - REMOVAL).

(3) Remove radio mounting screws (Fig. 6).

Fig. 6 RADIO

(4) Disconnect electrical harness connector.

CAUTION: Pulling the antenna cable straight out of
the radio without pulling on the locking antenna
connector could damage the cable or radio.

(5) Disconnect the antenna cable by pulling the
locking antenna connector away from the radio (Fig.

7)

8A - 8 AUDIO DR

RADIO (Continued)

Factory-installed radio noise suppression is accom­plished primarily through circuitry or devices that
are integral to the factory-installed radios, audio
power amplifiers and other on-board electrical com­ponents such as generators, wiper motors, blower
motors, and fuel pumps that have been found to be
potential sources of RFI or EMI. External radio noise
suppression devices that are used on this vehicle to
control RFI or EMI, and can be serviced, include the
following:

• Engine-to-body ground strap - This length of
braided ground strap has an eyelet terminal connec­tor crimped to each end. One end is secured to the
engine cylinder head(s). The other is secured to the
plenum at the exhaust heat shield forward/outer
attaching stud.

Fig. 7 ANTENNA TO RADIO

1 - RADIO
2 - LOCKING ANTENNA CONNECTOR
3 - INSTRUMENT PANELANTENNACABLE

• Resistor-type spark plugs - This type of spark
plug has an internal resistor connected in series
between the spark plug terminal and the center elec­trode to help reduce the production of electromag­netic radiation that can result in radio noise.

INSTALLATION

(1) Install antenna cable to radio.
(2) Connect electrical harness connector to radio.
(3) Install radio to instrument panel.

(4) Install instrument panel center bezel (Refer to
23 - BODY/INSTRUMENT PANEL/INSTRUMENT
PANEL CENTER BEZEL - INSTALLATION).

(5) Connect battery negative cable.

RADIO NOISE SUPPRESSION
GROUND STRAP

DESCRIPTION

Radio noise suppression devices are factory-in­stalled standard equipment on this vehicle. Radio
Frequency Interference (RFI) and ElectroMagnetic
Interference (EMI) can be produced by any on-board
or external source of electromagnetic energy. These
electromagnetic energy sources can radiate electro­magnetic signals through the air, or conduct them
through the vehicle electrical system.

When the audio system converts RFI or EMI to an
audible acoustic wave form, it is referred to as radio
noise. This undesirable radio noise is generally man­ifested in the form of “buzzing,” “hissing,” “popping,”
“clicking,” “crackling,” and/or “whirring” sounds. In
most cases, RFI and EMI radio noise can be sup­pressed using a combination of vehicle and compo­nent grounding, filtering and shielding techniques.
This vehicle is equipped with factory-installed radio
noise suppression devices that were designed to min­imize exposure to typical sources of RFI and EMI;
thereby, minimizing radio noise complaints.

OPERATION

There are two common strategies that can be used
to suppress Radio Frequency Interference (RFI) and
ElectroMagnetic Interference (EMI) radio noise. The
first suppression strategy involves preventing the
production of RFI and EMI electromagnetic signals
at their sources. The second suppression strategy
involves preventing the reception of RFI and EMI
electromagnetic signals by the audio system compo­nents.

The use of braided ground straps in key locations
is part of the RFI and EMI prevention strategy.
These ground straps ensure adequate ground paths,
particularly for high current components such as
many of those found in the starting, charging, igni­tion, engine control and transmission control sys­tems. An insufficient ground path for any of these
high current components may result in radio noise
caused by induced voltages created as the high cur­rent seeks alternative ground paths through compo­nents or circuits intended for use by, or in close
proximity to the audio system components or circuits.

Preventing the reception of RFI and EMI is accom­plished by ensuring that the audio system compo­nents are correctly installed in the vehicle. Loose,
corroded or improperly soldered wire harness connec­tions, improperly routed wiring and inadequate audio
system component grounding can all contribute to
the reception of RFI and EMI. A properly grounded
antenna body and radio chassis, as well as a shielded
antenna coaxial cable with clean and tight connec­tions will each help reduce the potential for reception
of RFI and EMI.

DR AUDIO 8A - 9

RADIO NOISE SUPPRESSION GROUND STRAP (Continued)

REMOVAL

BED TO CAB

(1) Disconnect and isolate the battery negative

cable.

(2) Remove the attaching bolts and strap (Fig. 8).

Fig. 10 GROUND STRAP TO HEAT SHIELD

1 - STUD
2 - GROUND STRAP
3 - NUT

ENGINE TO HEAT SHIELD - 4.7L AND 5.7L ENGINE

Fig. 8 BED TO CAB GROUND STRAP

1 - BED
2 - CAB
3 - GROUND STRAP
4 - MOUNTING BOLTS

(1) Disconnect and isolate the battery negative
cable.

(2) Remove the attaching bolts from the cylinder
heads (Fig. 11).

ENGINE TO HEAT SHIELD - 3.7L ENGINE

(1) Disconnect and isolate the battery negative

cable.

(2) Remove the attaching bolts from the cylinder

heads (Fig. 9).

Fig. 9 ENGINE GROUND STRAP - 3.7L

1 - GROUND STRAP
2 - MOUNTING BOLTS

(3) Remove nut from heat shield and remove strap

(Fig. 10).

Fig. 11 ENGINE GROUND STRAP - 4.7L AND 5.7L

1 - GROUND STRAP
2 - MOUNTING BOLTS

(3) Remove nut from heat shield and remove strap
(Fig. 10).

ENGINE TO HEAT SHIELD - 5.9L AND 8.0L ENGINE

(1) Disconnect and isolate the battery negative
cable.

(2) Remove the attaching bolts from the cylinder
heads (Fig. 12).

(3) Remove nut from heat shield and remove strap
(Fig. 10).

8A - 10 AUDIO DR

RADIO NOISE SUPPRESSION GROUND STRAP (Continued)

Fig. 12 ENGINE GROUND STRAP - 5.9L (8.0L

SIMILAR)

1 - GROUND STRAP
2 - MOUNTING BOLTS

INSTALLATION

BED TO CAB

(1) Install the ground strap and retaining bolts.

Tighten to 5 N·m (45 in. lbs.).

(2) Connect the battery negative cable.

ENGINE TO HEAT SHIELD

(1) Install the retaining nut and ground strap to

the plenum. Tighten to 8 N·m (70 in. lbs.).

(2) Install the retaining bolt and ground strap to
the engine cylinder heads. Tighten to 12 N·m (106 in.
lbs.).

(3) Connect the battery negative cable.

REMOTE SWITCHES

DESCRIPTION

A remote radio control switch option is available on
some models. Two rocker-type switches are mounted
on the back (instrument panel side) of the steering
wheel spokes (Fig. 13). The switch on the left spoke
is the seek switch and has seek up, seek down, and
preset station advance functions. The switch on the
right spoke is the volume control switch and has vol­ume up, and volume down functions. The switch on
the right spoke also includes a “mode” control that
allows the driver to sequentially select AM radio, FM
radio, cassette player, CD player or CD changer (if
equipped).

Fig. 13 Remote Radio Switch Operational View

1 - PRESET SEEK
2 - SEEK UP
3 - VOLUME UP
4 - MODE
5 - VOLUME DOWN
6 - SEEK DOWN

OPERATION

The six switches in the two remote radio switch
units are normally open, resistor multiplexed
momentary switches that are hard wired to the Inte­grated Power Module (IPM) through the clockspring.
The IPM sends a five volt reference signal to both
switch units on one circuit, and senses the status of
all of the switches by reading the voltage drop on a
second circuit.

When the IPM senses an input (voltage drop) from
any one of the remote radio switches, it sends the
proper switch status messages on the Programmable
Communication Interface (PCI) data bus network to
the radio receiver. The electronic circuitry within the
radio receiver is programmed to respond to these
remote radio switch status messages by adjusting the
radio settings as requested. For diagnosis of the IPM
or the PCI data bus, the use of a DRB IIIt scan tool
and the proper Diagnostic Procedures manual are
recommended.

For more information on the features and control
functions for each of the remote radio switches, refer
to the owner’s manual.

DR AUDIO 8A - 11

REMOTE SWITCHES (Continued)

DIAGNOSIS AND TESTING - REMOTE
SWITCHES

Any diagnosis of the Audio system should
begin with the use of the DRB IIIt diagnostic
tool. For information on the use of the DRB
IIIt, refer to the appropriate Diagnostic Service
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 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 ISO­LATE THE BATTERY NEGATIVE (GROUND) CABLE,
THEN WAIT TWO MINUTES FOR THE AIRBAG SYS­TEM CAPACITOR TO DISCHARGE BEFORE PER­FORMING FURTHER DIAGNOSIS OR SERVICE. THIS
IS THE ONLY SURE WAY TO DISABLE THE AIRBAG
SYSTEM. FAILURE TO TAKE THE PROPER PRE­CAUTIONS COULD RESULT IN ACCIDENTAL AIR­BAG DEPLOYMENT AND POSSIBLE PERSONAL
INJURY.

(1) Disconnect and isolate the battery negative
cable. Remove the remote radio switch(es) (Fig. 14)
from the steering wheel (Refer to 8 - ELECTRICAL/
AUDIO/REMOTE SWITCHES - REMOVAL).

(2) Use an ohmmeter to check the switch resis­tances as shown in the Remote Radio Switch Test
chart. If the remote radio switch resistances check
OK, go to Step 3. If not OK, replace the faulty
switch.

REMOTE RADIO SWITCH TEST TABLE

Switch Switch Position Resistance

Right

(White)

Right

(White)

Right

(White)

Left

(Black)

Left

(Black)

Left

(Black)

(3) Reconnect the battery negative cable. Turn the
ignition switch to the On position. Check for 5 volts
at the radio control mux circuit cavities of the steer­ing wheel wire harness connectors for both remote
radio switches. If OK, go to Step 4. If not OK, repair
the open or shorted radio control mux circuit to the
Integrated Power Module (IPM) as required.

(4) Disconnect and isolate the battery negative
cable. Disconnect the 22-way instrument panel wire
harness connector from the IPM. Check for continu­ity between the remote radio switch ground circuit
cavities of the steering wheel wire harness connec­tors for both remote radio switches and a good
ground. There should be no continuity. If OK, go to
Step 5. If not OK, repair the shorted remote radio
switch ground circuit to the IPM as required.

(5) Check for continuity between the remote radio
switch ground circuit cavities of the steering wheel
wire harness connectors for both remote radio
switches and the 22-way instrument panel wire har­ness connector for the IPM. There should be continu­ity. If OK, refer to the proper Diagnostic Procedures
manual to test the IPM and the PCI data bus. If not
OK, repair the open remote radio switch ground cir­cuit as required.

Volume Up

Volume Down

Mode Advance

Seek Up

Seek Down

Pre-Set Station

Advance

1.210 Kilohms
±1%

3.010 Kilohms
±1%

0.0511 Kilohms
±1%

0.261 Kilohms
±1%

0.681 Kilohms
±1%

0.162 Kilohms
±1%

Fig. 14 Remote Radio Switches

1 - BLACK (LEFT) SWITCH
2 - WHITE (RIGHT) SWITCH

8A - 12 AUDIO DR

REMOTE SWITCHES (Continued)

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 ISO­LATE THE BATTERY NEGATIVE (GROUND) CABLE,
THEN WAIT TWO MINUTES FOR THE AIRBAG SYS­TEM CAPACITOR TO DISCHARGE BEFORE PER­FORMING FURTHER DIAGNOSIS OR SERVICE. THIS
IS THE ONLY SURE WAY TO DISABLE THE AIRBAG
SYSTEM. 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 driver airbag from the vehicle
(Refer to 8 - ELECTRICAL/RESTRAINTS/DRIVER
AIRBAG - REMOVAL).

(3) Remove the speed control switches (Refer to 8 ­ELECTRICAL/SPEED CONTROL/SWITCH ­REMOVAL).

(4) Unplug the wire harness connector from the
remote radio switch(es).

AIRBAG, OR INSTRUMENT PANEL COMPONENT
DIAGNOSIS OR SERVICE. DISCONNECT AND ISO­LATE THE BATTERY NEGATIVE (GROUND) CABLE,
THEN WAIT TWO MINUTES FOR THE AIRBAG SYS­TEM CAPACITOR TO DISCHARGE BEFORE PER­FORMING FURTHER DIAGNOSIS OR SERVICE. THIS
IS THE ONLY SURE WAY TO DISABLE THE AIRBAG
SYSTEM. FAILURE TO TAKE THE PROPER PRE­CAUTIONS COULD RESULT IN ACCIDENTAL AIR­BAG DEPLOYMENT AND POSSIBLE PERSONAL
INJURY.

(1) Install remote radio switch to the steering

wheel.

(2) Connect the wire harness to the remote radio

switch.

(3) Install the speed control switches (Refer to 8 ­ELECTRICAL/SPEED CONTROL/SWITCH ­INSTALLATION).

(4) Install the driver airbag

(5) Connect the battery negative cable.

SPEAKER

DESCRIPTION

STANDARD

The standard equipment speaker system includes
speakers in four locations. One 15.2 X 22.8 centime­ter (6 X 9 inch) full-range speaker is located in each
front door. There is also one full-range 13.3 centime­ter (5.25 inch) diameter full-range speaker located in
each rear door.

Fig. 15 REMOTE SWITCHES

1 - REMOTE SWITCH
2 - SPEED CONTROL SWITCH
3 - BOLT

(5) Depress the tabs on each side of each switch
and push the switch through the rear steering wheel
cover (Fig. 15).

INSTALLATION

WARNING: DISABLE THE AIRBAG SYSTEM
BEFORE ATTEMPTING ANY STEERING WHEEL,
STEERING COLUMN, SEAT BELT TENSIONER, SIDE

PREMIUM

The optional premium speaker system features
eleven Premium model speakers in seven locations.
Each of the standard speakers is replaced with Pre­mium model speakers. One 8.8 centimeter (3.50 inch)
diameter speaker is located on each end of the
instrument panel top pad. One 6.3 centimeter (2.50
inch) diameter speaker is located in the center of the
instrument panel top pad. One 15.2 X 22.8 centime­ter (6 X 9 inch) Premium speaker is located in each
front door. There is also one coaxial 13.3 centimeter
(5.25 inch) diameter Premium full-range speaker
located in each rear door. The premium speaker sys­tem also includes a power amplifier mounted behind
the glove box. The total available power of the pre­mium speaker system is 240 watts.

OPERATION

Two wires connected to each speaker, one feed cir­cuit (+) and one return circuit (–), allow the audio
output signal electrical current to flow through the
voice coil. For complete circuit diagrams, refer to the

DR AUDIO 8A - 13

SPEAKER (Continued)

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.

DIAGNOSIS AND TESTING - SPEAKER

Any diagnosis of the Audio system should
begin with the use of the DRB IIIt diagnostic
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 ISO­LATE THE BATTERY NEGATIVE (GROUND) CABLE,
THEN WAIT TWO MINUTES FOR THE AIRBAG SYS­TEM CAPACITOR TO DISCHARGE BEFORE PER­FORMING FURTHER DIAGNOSIS OR SERVICE. THIS
IS THE ONLY SURE WAY TO DISABLE THE AIRBAG
SYSTEM. FAILURE TO TAKE THE PROPER PRE­CAUTIONS COULD RESULT IN ACCIDENTAL AIR­BAG DEPLOYMENT AND POSSIBLE PERSONAL
INJURY.

cable. If vehicle is not equipped with a amplifier,
remove the radio receiver. If vehicle is equipped with
an amplifier. disconnect wire harness connector at
output side of amplifier. Go to Step 5.

(5) Check both the speaker feed (+) circuit and
return (-) circuit cavities for the inoperative speaker
at the radio receiver wire harness connector for con­tinuity to ground. There should be no continuity. If
OK, go to Step 6. If not OK, repair the shorted
speaker feed (+) and/or return (-) circuits(s) to the
speaker as required.

(6) Disconnect wire harness connector at the inop­erative speaker. Check for continuity between the
speaker feed (+) circuit cavities of the radio receiver
wire harness connector or if equipped, the amplifier
wire harness connector and the speaker wire harness
connector. Repeat the check between the speaker
return (-) circuit cavities of the radio receiver wire
harness connector and the speaker wire harness con­nector. In each case, there should be continuity. If
OK, replace the faulty speaker. If not OK, repair the
open speaker feed (+) and/or return (-) circuits(s) as
required.

REMOVAL

FRONT DOOR SPEAKER

(1) Disconnect and isolate the battery negative
cable.

(2) Remove front door trim panel (Refer to 23 ­BODY/DOOR - FRONT/TRIM PANEL - REMOVAL).

(3) Remove speaker mounting screws (Fig. 16).

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
and/or amplifier may result.

(1) If all speakers are inoperative, check the fuses
in the Integrated Power Module (IPM). If OK, go to
Step 2. If not OK, repair the shorted circuit or com­ponent as required and replace the faulty fuse.

(2) Check the amplifier fuse (if equipped) in the
IPM. If OK, go to Step 3. If not OK, repair the
shorted circuit or component as required and replace
the faulty fuse.

(3) Turn the ignition switch to the ON position.
Turn the radio receiver ON. Adjust the balance and
fader control controls to check the performance of
each individual speaker. Note the speaker locations
that are not performing correctly. Go to Step 4.

(4) Turn the radio receiver OFF. Turn the ignition
OFF. Disconnect and isolate the battery negative

Fig. 16 FRONT DOOR SPEAKER

(4) Disconnect electrical harness connector and

remove speaker.

8A - 14 AUDIO DR

SPEAKER (Continued)

INSTRUMENT PANEL CENTER SPEAKER

(1) Disconnect and isolate the battery negative
cable.

(2) Remove instrument panel top cover (Refer to
23 - BODY/INSTRUMENT PANEL/INSTRUMENT
PANEL TOP COVER - REMOVAL).

(3) Remove speaker mounting screws (Fig. 17).

Fig. 17 INSTRUMENT PANEL CENTER SPEAKER

(4) Disconnect electrical harness connector and
remove speaker.

REAR CAB SIDE SPEAKER

(1) Disconnect and isolate the battery negative

cable.

(2) Remove B-pillar lower trim (Refer to 23 ­BODY/INTERIOR/B-PILLAR LOWER TRIM ­REMOVAL).

(3) Remove speaker mounting screws (Fig. 19).

Fig. 19 REAR CAB SIDE SPEAKER

(4) Disconnect electrical harness connector and
remove speaker.

INSTRUMENT PANEL END SPEAKER

(1) Disconnect and isolate the battery negative

cable.

(2) Remove instrument panel top cover (Refer to
23 - BODY/INSTRUMENT PANEL/INSTRUMENT
PANEL TOP COVER - REMOVAL).

(3) Remove speaker mounting screws (Fig. 18)

Fig. 18 INSTRUMENT PANEL END SPEAKER

(4) Disconnect electrical harness connector and
remove speaker.

REAR DOOR SPEAKER

(1) Disconnect and isolate the battery negative

cable.

(2) Remove rear door trim panel (Refer to 23 -

BODY/DOORS - REAR/TRIM PANEL - REMOVAL).

(3) Remove speaker mounting screws (Fig. 20).

Fig. 20 REAR DOOR SPEAKER

(4) Disconnect electrical harness connector and

remove speaker.

DR AUDIO 8A - 15

SPEAKER (Continued)

INSTALLATION

FRONT DOOR SPEAKER

(1) Connect electrical harness connector and
install speaker.

(2) Install front door trim panel (Refer to 23 ­BODY/DOOR - FRONT/TRIM PANEL - INSTALLA­TION).

(3) Connect battery negative cable.

INSTRUMENT PANEL CENTER SPEAKER

(1) Connect electrical harness connector and
install speaker.

(2) Install instrument panel top cover (Refer to 23

- BODY/INSTRUMENT PANEL/INSTRUMENT
PANEL TOP COVER - INSTALLATION).

(3) Connect battery negative cable.

INSTRUMENT PANEL END SPEAKER

(1) Connect electrical harness connector and
install speaker.

(2) Install instrument panel top cover (Refer to 23

- BODY/INSTRUMENT PANEL/INSTRUMENT
PANEL TOP COVER - INSTALLATION).

(3) Connect battery negative cable.

REAR CAB SIDE SPEAKER

(1) Connect electrical harness connector and

install speaker.

(2) Install B-pillar lower trim (Refer to 23 - BODY/
INTERIOR/B-PILLAR LOWER TRIM - INSTALLA­TION).

(3) Connect battery negative cable.

REAR DOOR SPEAKER

(1) Connect electrical harness connector and
install speaker.

(2) Install rear door trim panel (Refer to 23 ­BODY/DOORS - REAR/TRIM PANEL - INSTALLA­TION).

(3) Connect battery negative cable.