Dodge Durango (DN). Manual — part 286

Audio System Diagnosis

CONDITION

POSSIBLE CAUSE

CORRECTION

NO COMPACT DISC
OPERATION

1. Faulty CD.
2. Foreign material on CD.
3. Condensation on CD or
optics.
4. Faulty CD player.

1. Insert known good CD and test operation.
2. Clean CD and test operation.
3. Allow temperature of vehicle interior to stabilize
and test operation.
4. Exchange or replace radio, if required.

RADIO RECEIVER

If the vehicle is equipped with the optional remote

radio switches located on the steering wheel and the
problem being diagnosed is related to one of the
symptoms listed below, be certain to check the
remote radio switches and circuits. Refer to Remote
Radio Switch in the Diagnosis and Testing section
of this group prior to attempting radio diagnosis or
repair.

• Stations changing with no remote radio switch

input

• Radio memory presets not working properly

• Volume changes with no remote radio switch

input

• Remote radio switch buttons taking on other

functions

• CD player skipping tracks

• Remote radio switch inoperative.
For complete circuit diagrams, refer to Audio Sys-

tem in the Contents of Group 8W - Wiring Diagrams.

WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS,

REFER

TO

GROUP

8M

-

PASSIVE

RESTRAINT SYSTEMS BEFORE ATTEMPTING ANY
STEERING

WHEEL,

STEERING

COLUMN,

OR

INSTRUMENT PANEL COMPONENT DIAGNOSIS OR
SERVICE. FAILURE TO TAKE THE PROPER PRE-
CAUTIONS COULD RESULT IN ACCIDENTAL AIR-
BAG DEPLOYMENT AND POSSIBLE PERSONAL
INJURY.

CAUTION: The speaker output of the radio receiver
is a “floating ground” system. Do not allow any
speaker lead to short to ground, as damage to the
radio receiver may result.

(1) Check the fused B(+) fuse in the junction block.

If OK, go to Step 2. If not OK, repair the shorted cir-
cuit or component as required and replace the faulty
fuse.

(2) Check for battery voltage at the fused B(+) fuse

in the junction block. If OK, go to Step 3. If not OK,
repair the open fused B(+) circuit to the Power Dis-
tribution Center (PDC) as required.

(3) Check the fused ignition switch output (acc/

run) fuse in the junction block. If OK, go to Step 4. If

not OK, repair the shorted circuit or component as
required and replace the faulty fuse(s).

(4) Turn the ignition switch to the On position.

Check for battery voltage at the fused ignition switch
output (acc/run) fuse in the junction block. If OK, go
to Step 5. If not OK, repair the open fused ignition
switch output (acc/run) circuit to the ignition switch
as required.

(5) Turn the ignition switch to the Off position.

Disconnect and isolate the battery negative cable.
Remove the radio receiver from the instrument
panel, but do not disconnect the wire harness connec-
tors. Check for continuity between the radio receiver
chassis and a good ground. There should be continu-
ity. If OK, go to Step 6. If not OK, repair the open
ground circuit to ground as required.

(6) 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.

REMOTE RADIO SWITCH

For complete circuit diagrams, refer to Audio Sys-

tem in the Contents of Group 8W - Wiring Diagrams.

WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS,

REFER

TO

GROUP

8M

-

PASSIVE

RESTRAINT SYSTEMS BEFORE ATTEMPTING ANY
STEERING

WHEEL,

STEERING

COLUMN,

OR

INSTRUMENT PANEL COMPONENT DIAGNOSIS OR
SERVICE. FAILURE TO TAKE THE PROPER PRE-
CAUTIONS COULD RESULT IN ACCIDENTAL AIR-
BAG DEPLOYMENT AND POSSIBLE PERSONAL
INJURY.

(1) Remove the remote radio switch(es) (Fig. 2)

from the steering wheel.

8F - 6

AUDIO SYSTEMS

DN

DIAGNOSIS AND TESTING (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.

(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.

SPEAKER

For complete circuit diagrams, refer to Audio Sys-

tem in the Contents of Group 8W - Wiring Diagrams.

WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS,

REFER

TO

GROUP

8M

-

PASSIVE

RESTRAINT SYSTEMS BEFORE ATTEMPTING ANY
STEERING

WHEEL,

STEERING

COLUMN,

OR

INSTRUMENT PANEL COMPONENT DIAGNOSIS OR
SERVICE. 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.

(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. Go to Step 2.

(2) Turn the radio receiver off. Turn the ignition

switch to the Off position. Disconnect and isolate the
battery negative cable. Remove the radio receiver
from the instrument panel. If the vehicle is equipped
with the Infinity speaker package, also disconnect
the wire harness connectors at the power amplifier.
Check both the speaker feed (+) circuit and return (–)
circuit cavities for the inoperative speaker location(s)
at the radio receiver wire harness connectors for con-
tinuity to ground. In each case, there should be no
continuity. If OK, go to Step 3. If not OK, repair the
shorted speaker feed (+) and/or return (–) circuit(s) to
the speaker as required.

(3) If the vehicle is equipped with the Infinity

speaker package, go to Step 6. If the vehicle is
equipped with the standard speaker system, check
the resistance between the speaker feed (+) circuit
and return (–) circuit cavities of the radio receiver
wire harness connectors for the inoperative speaker
location(s). The meter should read between 2 and 28
ohms (speaker resistance). If OK, go to Step 4. If not
OK, go to Step 5.

Fig. 2 Remote Radio Switches

1 – WHITE REAR SWITCH
2 – BLACK REAR 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

Advance

10 Ohms

DN

AUDIO SYSTEMS

8F - 7

DIAGNOSIS AND TESTING (Continued)

(4) Install a known good radio receiver. Connect

the battery negative cable. Turn the ignition switch
to the On position. Turn on the radio receiver and
test the speaker operation. If OK, replace the faulty
radio receiver. If not OK, turn the radio receiver off,
turn the ignition switch to the Off position, discon-
nect and isolate the battery negative cable, remove
the test radio receiver, and go to Step 5.

(5) Disconnect the wire harness connector at the

inoperative speaker. Check for continuity between
the speaker feed (+) circuit cavities of the radio
receiver 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 con-
tinuity. If OK, replace the faulty speaker. If not OK,
repair the open speaker feed (+) and/or return (–) cir-
cuit(s) as required.

(6) For each inoperative speaker location, check for

continuity between the speaker feed (+) circuit cavi-
ties of the radio receiver wire harness connectors and
the power amplifier wire harness connectors. Repeat
the check for each inoperative speaker location
between the speaker return (–) circuit cavities of the
radio receiver wire harness connectors and the power
amplifier wire harness connectors. In each case,
there should be continuity. If OK, go to Step 7. If not
OK, repair the open speaker feed (+) and/or return
(–) circuit(s) as required.

(7) Check for continuity between the two ground

circuit cavities of the power amplifier wire harness
connector and a good ground. There should be conti-
nuity. If OK, go to Step 8. If not OK, repair the open
ground circuit(s) to ground as required.

(8) Check the power amplifier fuse in the junction

block. If OK, go to Step 9. If not OK, repair the
shorted circuit or component as required and replace
the faulty fuse.

(9) Install the radio receiver. Connect the battery

negative cable. Check for battery voltage at the
power amplifier fuse in the junction block. If OK, go
to Step 10. If not OK, repair the open fused B(+) cir-
cuit to the PDC as required.

(10) Check for battery voltage at the two fused

B(+) circuit cavities of the power amplifier wire har-
ness connector. If OK, go to Step 11. If not OK, repair
the open fused B(+) circuit(s) to the fuse in the junc-
tion block as required.

(11) Turn the ignition switch to the On position.

Turn the radio receiver on. Check for battery voltage
at the radio 12 volt output circuit cavity of the power
amplifier wire harness connector. If OK, go to Step
12. If not OK, repair the open radio 12 volt output
circuit to the radio receiver as required.

(12) Turn the radio receiver off. Turn the ignition

switch to the Off position. Disconnect and isolate the
battery negative cable. For each inoperative speaker
location, check both the amplified feed (+) circuit and
the amplified return (–) circuit cavities of the power
amplifier wire harness connectors for continuity to
ground. In each case there should be no continuity. If
OK, go to Step 13. If not OK, repair the shorted
amplified feed (+) and/or amplified return (–) cir-
cuit(s) to the speaker as required.

(13) For each inoperative speaker location, check

the resistance between the amplified feed (+) circuit
and the amplified return (–) circuit cavities of the
power amplifier wire harness connectors. The meter
should read between 2 and 28 ohms (speaker resis-
tance). If OK, replace the faulty power amplifier. If
not OK, go to Step 14.

(14) Disconnect the speaker wire harness connec-

tor at the inoperative speaker. Check for continuity
between the amplified feed (+) circuit cavities of the
speaker wire harness connector and the power ampli-
fier

wire

harness

connector.

Repeat

the

check

between the amplified return (–) circuit cavities of
the speaker wire harness connector and the power
amplifier wire harness connector. In each case there
should be continuity. If OK, replace the faulty
speaker. If not OK, repair the open amplified feed (+)
and/or amplified return (–) circuit(s) as required.

POWER AMPLIFIER

The power amplifier unit should be checked if

there is no sound output noted from the speakers.
For diagnosis of the power amplifier, refer to
Speaker in the Diagnosis and Testing section of this
group. For complete circuit diagrams, refer to Audio
System in the Contents of Group 8W - Wiring Dia-
grams.

ANTENNA

WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS,

REFER

TO

GROUP

8M

-

PASSIVE

RESTRAINT SYSTEMS BEFORE ATTEMPTING ANY
STEERING

WHEEL,

STEERING

COLUMN,

OR

INSTRUMENT PANEL COMPONENT DIAGNOSIS OR
SERVICE. FAILURE TO TAKE THE PROPER PRE-
CAUTIONS COULD RESULT IN ACCIDENTAL AIR-
BAG 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.

8F - 8

AUDIO SYSTEMS

DN

DIAGNOSIS AND TESTING (Continued)

The ohmmeter test lead connections for each test

are shown in Antenna Tests (Fig. 3).

NOTE: This model has a special coating on the
antenna mast which is not electrically conductive.
Remove the antenna mast from the antenna base
before attempting to perform Tests 1 and 2.

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 inboard side of the glove
box opening to the antenna base, and then from the
coaxial cable connection to the radio chassis con-
nection.

TEST 1

Test 1 determines if the antenna mast is insulated

from the base. Proceed as follows:

(1) Disconnect the antenna coaxial cable connector

from the radio receiver chassis and isolate. Remove
the antenna mast from the antenna base.

(2) Insert one ohmmeter test lead into the socket

for the antenna mast in the center of the antenna
base. Connect the other test lead to the perimeter of
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. Remove the antenna
mast from the antenna base.

(2) Insert one ohmmeter test lead into the socket

for the antenna mast in the center of the antenna
base. 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-
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.

RADIO FREQUENCY INTERFERENCE

WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS,

REFER

TO

GROUP

8M

-

PASSIVE

RESTRAINT SYSTEMS BEFORE ATTEMPTING ANY
STEERING

WHEEL,

STEERING

COLUMN,

OR

INSTRUMENT PANEL COMPONENT DIAGNOSIS OR
SERVICE. FAILURE TO TAKE THE PROPER PRE-
CAUTIONS COULD RESULT IN ACCIDENTAL AIR-
BAG DEPLOYMENT AND POSSIBLE PERSONAL
INJURY.

Fig. 3 Antenna Tests

DN

AUDIO SYSTEMS

8F - 9

DIAGNOSIS AND TESTING (Continued)