ECU DODGE RAM 2002 Service Service Manual

SPECIAL TOOLS
AUDIO SYSTEMS
ANTENNA BODY & CABLE
DESCRIPTION
The antenna body and cable are not readily visible
in their installed positions in the vehicle. The most
visible component of the antenna body and cable are
the antenna adapter and the antenna cap nut, which
are located on the top of the right front fender panel
of the vehicle, near the right end of the cowl plenum.
The antenna body and cable are secured below the
fender panel by the antenna cap nut through a pre-
fabricated and dedicated mounting hole in the top of
the right front fender. The primary coaxial antenna
cable is then routed beneath the fender sheet metal
and through a prefabricated and dedicated cable
entry hole in the right cowl side panel into the inte-
rior 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 end of the instrument
panel. The secondary coaxial cable is then routed
behind the instrument panel to the back of the radio.
The factory-installed radio antenna body and cable
consists of the following components:
²Antenna adapter- The antenna adapter is
sometimes also referred to as the antenna bezel or
escutcheon.
²Antenna body- The die cast white metal
antenna body is the mating structure between the
antenna mast and the primary antenna coaxial cable.
²Antenna cable- This vehicle uses a two-piece
antenna coaxial cable. The primary antenna cable is
integral to the antenna body, and the secondary
antenna cable connects the primary cable to the
radio.
²Antenna cap nut- The antenna cap nut is a
special, bright-plated threaded fastener that captures
the antenna adapter and retains the antenna body to
the fender sheet metal.The components of the radio antenna body and
cable cannot be adjusted or repaired. All factory-in-
stalled radios automatically compensate for radio
antenna trim. Therefore, no antenna trimmer adjust-
ment is required or possible after replacing the
antenna body and cable or the radio. If an antenna
body and cable component is damaged or faulty, it
must be replaced. Other than the primary antenna
cable, which is integral to the antenna body, the indi-
vidual components of the antenna are available for
service replacement.
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.
The antenna body includes an integral flange that
mates with and grounds the antenna body to the
underside of the fender panel sheet metal. Above the
fender panel, the antenna body has a short nipple
that is externally threaded to accept the antenna cap
nut. Inside the nipple is a plastic insulator tube, and
inside this insulator is an internally threaded metal
receptacle that accepts the adapter stud on the bot-
tom of the antenna mast. The antenna adapter
serves as an above fender interface to mount and
secure the antenna body to the vehicle. The antenna
adapter is a black molded plastic component that
provides a functional transition between the top of
the fender and the antenna cap nut, while concealing
the edges of the antenna mounting hole and protect-
ing the painted finish of the fender from marring as
the antenna cap nut is tightened. The adapter is
installed over and shrouds the threaded nipple of the
antenna body, which is installed from under and pro-
trudes through the top of the mounting hole in the
fender. The antenna cap nut is installed on top of the
antenna adapter and tightened onto the external
threads of the antenna body nipple to effectively
secure and ground the antenna body to the fender.
Antenna Nut Wrench C-4816
8A - 4 AUDIOBR/BE
AUDIO (Continued)

Three notches on the outer circumference of the cap
nut are engaged by matching projections of an
antenna nut wrench (Special Tool C-4816) to facili-
tate the removal and installation of this special fas-
tener. Proper tightening of the antenna cap nut is
critical to ensuring proper grounding of the antenna
body to the fender sheet metal, which is necessary
for clear radio signal reception.
A short length of coaxial cable serves as the pri-
mary antenna cable. The center conductor of the
cable is connected to the antenna mast receptacle.
The outer wire mesh of the cable is connected to and
grounded through the antenna body. One end of the
primary antenna cable is securely crimped to the
lower end of the antenna body, while the opposite
end features a simple push/pull-type male coaxial
cable connector that serves as the in-line connector to
the instrument panel (secondary) antenna coaxial
cable. The primary coaxial cable includes a grommet
that seals the cable to an entry hole in the right cowl
side outer panel where the cable passes into the pas-
senger compartment of the vehicle. The secondary
antenna cable has a push/pull-type male coaxial
cable connector on the radio end, and a push/pull-
type female coaxial cable connector on the opposite
end, which serves as the in-line connector to the pri-
mary antenna cable. In the passenger compartment
the primary cable is routed to the lower right side of
the instrument panel, where it is connected to the
secondary instrument panel antenna cable. The
instrument panel antenna cable is routed near the
instrument panel wire harness through the instru-
ment panel to the radio and is secured to the instru-
ment panel structural support with small metal
push-on retainers. This two-piece antenna cable
arrangement allows the instrument panel or the
antenna body and cable to be removed or installed
without disturbing the radio.
DIAGNOSIS AND TESTING - ANTENNA
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:
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 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 a coaxial cable problem; from the
coaxial cable connection under the right end of the
instrument panel near the right cowl side inner
panel to the antenna base, and then from the coax-
ial cable connection to the radio receiver chassis
connection.
TEST 1
Test 1 determines if the antenna mast is insulated
from the base. Proceed as follows:
(1) Disconnect and isolate the antenna coaxial
cable connector from the radio receiver chassis.
(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) Disconnect the antenna coaxial cable connector
from the radio receiver 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
Fig. 1 Antenna Tests
BR/BEAUDIO 8A - 5
ANTENNA BODY & CABLE (Continued)

assembly. Replace the faulty or damaged antenna
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-
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 terminal post.
(2) The resistance should be less than one ohm.
(3) If the resistance is more than one ohm, check
the braided ground strap(s) connected to the engine
and the vehicle body for being loose, corroded, or
damaged. Repair the ground strap connections, 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
(1) Disconnect and isolate the battery negative
cable.
(2) Reach under the passenger side of the instru-
ment panel near the right cowl side inner panel to
disengage the coaxial cable connector from the
retainer clip located on the bottom of the heater-A/C
housing (Fig. 2).
(3) Remove the foam tape to access the coaxial
cable connector. Disconnect the connector by pulling
it apart while twisting the metal connector halves.
Do not pull on the 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 or ªfishº the cable back
into position during installation.
(5) Reach above the Powertrain Control Module
(PCM) on the right side of the dash panel in the
engine compartment to disengage the antenna coax-
ial cable grommet from the hole in the dash panel
(Fig. 3).
(6) Pull the antenna coaxial cable out of the pas-
senger compartment and into the engine compart-
ment through the hole in the dash panel.(7) Raise the sleeve on the antenna mast far
enough to access and unscrew the antenna mast from
the antenna body (Fig. 4).
(8) Remove the antenna cap nut using an antenna
nut wrench (Special Tool C-4816) (Fig. 5).
(9) Remove the antenna adapter from the top of
the fender.
(10) Lower the antenna body and cable assembly
through the top of the fender.
(11) Pull the antenna body and cable out through
the opening between the right cowl side outer panel
and the top of the fender, while feeding the antenna
coaxial cable out of the engine compartment through
the hole in the right cowl side reinforcement.
(12) Untie the cord or twine from the antenna
body and cable coaxial cable connector, leaving the
cord or twine in the place of the cable through the
vehicle.
(13) Remove the antenna body and cable from the
vehicle.
INSTALLATION
(1) Tie the end of the cord or twine that was used
during instrument panel antenna cable removal
securely to the connector on the end of the antenna
cable being installed into the instrument panel. This
cord will be used to pull or ªfishº the cable back into
position.
Fig. 2 Antenna Coaxial Cable Connector
1 - RETAINER CLIP
2 - TO RADIO
3 - TO ANTENNA
4 - FOAM TAPE
8A - 6 AUDIOBR/BE
ANTENNA BODY & CABLE (Continued)

(4) Remove the two screws that secure the filter,
choke, and speaker relay mounting bracket to the
instrument panel center brace.
(5) Remove the filter, choke, and speaker relay
unit from under the instrument panel.
INSTALLATION
(1) Position the filter, choke, and speaker relay
unit under the instrument panel.
(2) Install and tighten the two screws that secure
the filter, choke, and speaker relay mounting bracket
to the instrument panel center brace. Tighten the
screws to 2.7 N´m (24 in. lbs.).
(3) Reconnect the instrument panel wire harness
connector to the filter, choke and speaker relay wire
harness connector.
(4) Reconnect the battery negative cable.
INSTRUMENT PANEL
ANTENNA CABLE
REMOVAL
(1) Disconnect and isolate the battery negative
cable.
(2) Reach under the passenger side of the instru-
ment panel near the right cowl side inner panel to
disengage the coaxial cable connector from the
retainer clip located on the bottom of the heater-A/C
housing.
(3) Remove the foam tape to access the coaxial
cable connector. Disconnect the connector by pulling
it apart while twisting the metal connector halves.
Do not pull on the cable.
(4) Securely tie a suitable length of cord or twine
to the instrument panel half of the antenna coaxial
cable connector. This cord will be used to pull or
ªfishº the cable back into position during installation.
(5) Roll down the glove box from the instrument
panel. Refer to Body, Instrument Panel for the proce-
dures.
(6) Reach through the glove box opening to disen-
gage the antenna cable from the retainer clips on the
back of the instrument panel (Fig. 7).
(7) Remove the radio receiver from the instrument
panel. Refer to Audio, Radio for the procedures.
(8) Pull the antenna cable out through the radio
receiver opening in the instrument panel.
(9) Untie the cord or twine from the instrument
panel antenna cable connector, leaving the cord or
twine in place of the cable in the instrument panel.
(10) Remove the antenna cable from the instru-
ment panel.
INSTALLATION
(1) Tie the end of the cord or twine that was used
during instrument panel antenna cable removal
securely to the connector on the end of the antenna
cable being installed into the instrument panel. This
cord will be used to pull or ªfishº the cable back into
position.
(2) Using the cord or twine, pull the antenna cable
through the radio receiver opening from under the
instrument panel.
(3) Install the radio receiver onto the instrument
panel. Refer to Audio, Radio for the procedures.
(4) Reach through the glove box opening to engage
the antenna cable with the retainer clips on the back
of the instrument panel.
(5) Install the glove box onto the instrument panel.
Refer to Body, Instrument Panel for the procedures.
(6) Untie the cord or twine from the instrument
panel antenna cable connector.
(7) Reach under the passenger side of the instru-
ment panel near the right cowl side inner panel to
reconnect the two halves of the radio antenna coaxial
cable connector. Wrap the connection with a piece of
foam tape.
(8) Engage the coaxial cable connector with the
retainer clip located on the bottom of the heater-A/C
housing.
(9) Reconnect the battery negative cable.
Fig. 7 ANTENNA CABLE ROUTING
1 - RETAINER CLIPS
2 - TO RADIO
3 - TO ANTENNA
BR/BEAUDIO 8A - 9
RADIO CHOKE RELAY (Continued)

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) 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 left (gray) radio wire harness
connector. If OK, go to Step 7. If not OK, repair the
open fused ignition switch output (acc/run) circuit to
the junction block fuse as required.
(7) Turn the ignition switch to the Off position.
Check for battery voltage at the fused B(+) circuit
cavity of the left (gray) 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
(1) Disconnect and isolate the battery negative
cable.
(2) Remove the cluster bezel from the instrument
panel.
(3) Remove the two screws that secure the radio
receiver to the instrument panel (Fig. 8).
(4) Pull the radio receiver out from the instrument
panel far enough to access the instrument panel wire
harness connectors and the antenna coaxial cable
connector (Fig. 9).
(5) Disconnect the instrument panel wire harness
connectors and the antenna coaxial cable connector
from the receptacles on the rear of the radio receiver.
(6) If so equipped, remove the screw that secures
the ground wire to the back of the radio receiver
chassis.
(7) Remove the radio receiver from the instrument
panel.
INSTALLATION
(1) Position the radio receiver to the instrument
panel.
(2) If so equipped, install and tighten the screw
that secures the ground wire to the back of the radio
receiver chassis. Tighten the screw to 7 N´m (65 in.
lbs.).
(3) Reconnect the instrument panel wire harness
connectors and the antenna coaxial cable connector
to the receptacles on the rear of the radio receiver.
(4) Position the radio receiver into the mounting
hole in the instrument panel.(5) Install and tighten the two screws that secure
the radio receiver to the instrument panel. Tighten
the screws to 5 N´m (45 in. lbs.).
(6) Install the cluster bezel onto the instrument
panel.
(7) Reconnect the battery negative cable.
Fig. 8 Radio Receiver Remove/Install
1 - WIRE HARNESS CONNECTORS
2 - ANTENNA COAXIAL CABLE
3 - RADIO
4 - SCREW
5 - GROUND WIRE
6 - SCREW
Fig. 9 Radio Receiver Connections - Typical
1 - ANTENNA CABLE
2 - RADIO
3 - INSTRUMENT PANEL WIRING
4 - GROUND WIRE
BR/BEAUDIO 8A - 11
RADIO (Continued)

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:
²Radio antenna base ground
²Radio receiver chassis ground wire or strap
²Engine-to-body ground straps
²Cab-to-bed ground strap
²Heater core ground strap
²Resistor-type spark plugs
²Radio suppression-type secondary ignition wir-
ing.
For more information on the spark plugs and sec-
ondary ignition components, refer to Electrical, Igni-
tion Control.
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, details of wire harness routing
and retention, connector pin-out information and
location views for the various wire harness connec-
tors, splices and grounds. Inspect the ground paths
and connections at the following locations:
²Blower motor
²Cab-to-bed ground strap
²Electric fuel pump
²Engine-to-body ground straps
²Generator
²Ignition module
²Heater core ground strap
²Radio antenna base ground
²Radio receiver chassis ground wire or strap
²Wiper 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.
For service and inspection of secondary ignition
components, refer to Electrical, Ignition Control.
Inspect the following secondary ignition system com-
ponents:
²Distributor cap and rotor
²Ignition coil
²Spark plugs
²Spark 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:
²Power connections should be made directly to
the battery, and fused as closely to the battery as
possible.
²The 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.
²The 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.
²The antenna and cable must be carefully
matched to ensure a low Standing Wave Ratio
(SWR).
Fleet vehicles are available with an extra-cost RFI-
suppressed Powertrain Control Module (PCM). This
unit reduces interference generated by the PCM on
some radio frequencies used in two-way radio com-
munications. However, this unit will not resolve com-
plaints of RFI in the commercial AM or FM radio
frequency ranges.
ENGINE-TO-BODY GROUND
STRAP
REMOVAL
(1) Remove the screw that secures the engine-to-
body ground strap eyelet to the dash panel (Fig. 10).
(2) Remove the screw that secures the engine-to-
body ground strap eyelet to the back of the engine
cylinder head (Fig. 11) or (Fig. 12).
8A - 12 AUDIOBR/BE

(3) For the right side only on vehicles equipped
with a 3.9L, 5.2L or 5.9L engine, remove the nut that
secures the engine-to-body ground strap eyelet to the
right rear valve cover stud.
(4) Remove the engine-to-body ground strap from
the engine compartment.
INSTALLATION
(1) Position the engine-to-body ground strap to the
back of the engine cylinder head.(2) Install and tighten the screw that secures the
engine-to-body ground strap eyelet to the back of the
engine cylinder head. Tighten the screw to 10.6 N´m
(95 in. lbs.).
(3) For the right side only on vehicles equipped
with a 3.9L, 5.2L or 5.9L engine, position the engine-
to-body ground strap eyelet over the right rear valve
cover stud.
(4) For the right side only on vehicles equipped
with a 3.9L, 5.2L or 5.9L engine, install and tighten
the nut that secures the engine-to-body ground strap
eyelet to the right rear valve cover stud. Tighten the
nut to 3.9 N´m (35 in. lbs.).
(5) Position the engine-to-body ground strap to the
dash panel.
(6) Install and tighten the screw that secures the
engine-to-body ground strap eyelet to the dash panel.
Tighten the screw to 3.9 N´m (35 in. lbs.).
CAB-TO-BED GROUND STRAP
REMOVAL
(1) Raise and support the vehicle.
(2) Remove the screw that secures the cab-to-bed
ground strap eyelet to the front crossmember of the
cargo bed (Fig. 13).
(3) Remove the screw that secures the cab-to-bed
ground strap eyelet to the cab floor panel.
(4) Remove the cab-to-bed ground strap from the
vehicle.
Fig. 10 Engine-To-Body Ground
1 - SCREWS (2)
2 - GROUND STRAPS
Fig. 11 Engine-To-Body Ground Strap Remove/
Install - V6 & V8 Engine
1 - GROUND STRAP
2 - NUT
3 - GROUND STRAP
4 - SCREW
5 - SCREW
Fig. 12 Engine-To-Body Ground Strap Remove/
Install - V10 Engine
1 - GROUND STRAP
2 - GROUND STRAP
3 - SCREW
4 - SCREW
BR/BEAUDIO 8A - 13
ENGINE-TO-BODY GROUND STRAP (Continued)

INSTALLATION
(1) Position the cab-to-bed ground strap to the cab
floor panel.
(2) Install and tighten the screw that secures the
cab-to-bed ground strap eyelet to the cab floor panel.
Tighten the screw to 3.9 N´m (35 in. lbs.).
(3) Position the cab-to-bed ground strap to the
front crossmember of the cargo bed.
(4) Install and tighten the screw that secures the
cab-to-bed ground strap eyelet to the front crossmem-
ber of the cargo bed. Tighten the screw to 3.9 N´m
(35 in. lbs.).
(5) Lower the vehicle.
HEATER CORE GROUND
STRAP
REMOVAL
(1) Disconnect and isolate the battery negative
cable.
(2) Remove the glove box from the instrument
panel. Refer to Body, Instrument Panel for the proce-
dures.
(3) Reach through the instrument panel glove box
opening to access and remove the nut that secures
the heater core ground strap eyelet to the stud on the
dash panel (Fig. 14).
(4) Remove the heater core ground strap eyelet
from the stud on the dash panel.(5) Remove the screw that secures the heater core
ground strap eyelet and the heater core tube retain-
ing strap to the top of the heater-A/C housing.
(6) Remove the heater core ground strap from the
top of the heater-A/C housing.
INSTALLATION
(1) Position the heater core ground strap and the
heater core tube retaining strap to the top of the
heater-A/C housing.
(2) Install and tighten the screw that secures the
heater core ground strap eyelet and the heater core
tube retaining strap to the top of the heater-A/C
housing. Tighten the screw to 2.2 N´m (20 in. lbs.).
(3) Position the heater core ground strap eyelet
over the stud on the dash panel.
(4) Install and tighten the nut that secures the
heater core ground strap eyelet to the stud on the
dash panel. Tighten the nut to 3.9 N´m (35 in. lbs.).
(5) Install the glove box onto the instrument panel.
Refer to Body, Instrument Panel for the procedures.
(6) Reconnect the battery negative cable.
REMOTE SWITCHES
DESCRIPTION
A remote radio switch option is available on models
equipped with the AM/FM/CD/cassette/3-band
graphic equalizer (RAZ sales code) radio receiver and
the high-line Central Timer Module (CTM). Refer to
Fig. 13 Cab-To-Bed Ground Strap Remove/Install
1 - BED CROSSMEMBER
2 - GROUND STRAP
3 - CAB FLOOR PANEL
4 - SCREWS
Fig. 14 Heater Core Ground Strap Remove/Install
1 - GROUND STRAP
2 - NUT
3 - HEATER-A/C HOUSING
4 - DASH PANEL
8A - 14 AUDIOBR/BE
CAB-TO-BED GROUND STRAP (Continued)

(2) Use an ohmmeter to check the switch resis-
tances 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
SWITCH SWITCH POSITION RESISTANCE
Right
(White)Volume Up 7320 Ohms
Right
(White)Volume Down 1210 Ohms
Left
(Black)Seek Up 4530 Ohms
Left
(Black)Seek Down 2050 Ohms
Left
(Black)Pre-Set Station
Advance10 Ohms
(3) Check for continuity between the ground cir-
cuit cavity of the remote radio switch wire harness
connector and a good ground. There should be conti-
nuity. If OK, go to Step 4. If not OK, repair the open
ground circuit to ground as required.
(4) Disconnect the 18-way wire harness connector
from the Central Timer Module (CTM). Check for
continuity between the radio control mux circuit cav-
ity of the remote radio switch wire harness connector
and a good ground. There should be no continuity. If
OK, go to Step 5. If not OK, repair the shorted radio
control mux circuit as required.
(5) Check for continuity between the radio control
mux circuit cavities of the remote radio switch wire
harness connector and the 18-way CTM wire harness
connector. There should be continuity. If OK, refer to
the proper Diagnostic Procedures manual to test the
CTM and the Chrysler Collision Detection (CCD)
data bus. If not OK, repair the open radio control
mux circuit as required.
REMOVAL
(1) Disconnect and isolate the battery negative
cable.
(2) Remove the driver side airbag module from the
steering wheel. Refer to Electrical, Restraints for the
procedures.
(3) Remove the speed control switch located on the
same side of the steering wheel as the remote radio
switch that is being serviced. Refer to Electrical,
Speed Control for the procedures.
(4) Disconnect the steering wheel wire harness
connector from the connector receptacle of the remote
radio switch (Fig. 17).(5) Disengage the four remote radio switch latches
that secure the switch to the inside of the mounting
hole in the steering wheel rear trim cover.
(6) From the outside of the steering wheel rear
trim cover, remove the remote radio switch from the
trim cover mounting hole.
INSTALLATION
(1) Position the remote radio switch to the mount-
ing hole on the outside of the steering wheel rear
trim cover. Be certain that the connector receptacle is
oriented toward the bottom of the switch and pointed
toward the center of the steering wheel.
(2) Press firmly and evenly on the remote radio
switch until each of the switch latches is fully
engaged in the mounting hole of the steering wheel
rear trim cover.
(3) Reconnect the steering wheel wire harness con-
nector to the connector receptacle of the remote radio
switch.
(4) Install the speed control switch onto the steer-
ing wheel. Refer to Electrical, Speed Control for the
procedures.
Fig. 17 Remote Radio Switches Remove/Install
1 - STEERING WHEEL
2 - REMOTE RADIO SWITCH
3 - SPEED CONTROL SWITCH
4 - SCREW (2)
5 - DRIVER SIDE AIRBAG MODULE
6 - SPEED CONTROL SWITCH
7 - REAR TRIM COVER
8 - SCREW (2)
8A - 16 AUDIOBR/BE
REMOTE SWITCHES (Continued)

(9) Remove the tweeter from the mounting hole in
the A-pillar trim.
INSTALLATION
(1) Position the tweeter into the mounting hole in
the A-pillar trim.
(2) Install the tweeter onto the A-pillar trim by
pushing in on the tweeter firmly and evenly from the
outside of the trim until it snaps into the mounting
hole.
(3) Use a suitable tape or adhesive to secure the
tweeter wire harness to the inside of the A-pillar
trim.
(4) Position the trim and tweeter to the A-pillar as
a unit.
(5) Reconnect the body wire harness connector to
the A-pillar tweeter wire harness connector.
(6) Engage the trim onto the A-pillar. Refer to
Body, Interior for the procedures.
(7) If the vehicle is so equipped, install the grab
handle onto the A-pillar. Refer to Body, Interior for
the procedures.
(8) Reconnect the battery negative cable.
FRONT DOOR SPEAKER
REMOVAL
(1) Disconnect and isolate the battery negative
cable.
(2) Remove the trim panel from the front door.
Refer to Body, Door Front for the procedures.
(3) Remove the four screws that secure the
speaker to the front door inner panel (Fig. 19).
(4) Pull the speaker away from the mounting hole
in the front door inner panel far enough to access the
speaker wire harness connector.
(5) Disconnect the speaker wire harness connector
from the front door wire harness connector.
(6) Remove the speaker from the front door inner
panel.
INSTALLATION
(1) Position the speaker to the front door inner
panel.
(2) Reconnect the speaker wire harness connector
to the front door wire harness connector.
(3) Position the speaker into the mounting hole in
the front door inner panel.
Fig. 18 A-Pillar Tweeter Remove/Install
1 - NUT
2 - WIRE HARNESS CONNECTOR
3 - MOULDING
4 - HANDLE
5 - PLUG
6 - SCREW
7 - TWEETER
Fig. 19 Front Door Speaker Remove/Install
1 - CLIP
2 - FRONT DOOR INNER PANEL
3 - WIRE HARNESS CONNECTOR
4 - SCREW
5 - SPEAKER
BR/BEAUDIO 8A - 19
A-PILLAR TWEETER SPEAKER (Continued)