Dodge 2000 DURANGO Service Manual page 348

8F - 8 AUDIO SYSTEMS
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
RESTRAINT SYSTEMS BEFORE ATTEMPTING ANY
STEERING WHEEL,
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.
GROUP 8M - PASSIVE
STEERING COLUMN,
DN
OR