Chrysler New Yorker. Manual — part 73
AMPLIFIED (CONTINUED)
8F - 12
AUDIO SYSTEMS
300M
DIAGNOSIS AND TESTING (Continued)
AMPLIFIED (CONTINUED)
300M
AUDIO SYSTEMS
8F - 13
DIAGNOSIS AND TESTING (Continued)
DIAGNOSTIC CONDITIONS
NOISE DISTORTION IN ALL SPEAKERS
Does the distortion occur through all operations:
• AM and FM stations
• Cassette tape
• Compact disc
If not, check for radio interference, damaged tape
or disc that may be causing the distortion. Refer to
Sound Systems Operating Instructions in the Owners
Manual for cleaning procedures of the cassette tape
player.
• Check battery voltage, for 11 Volts or more
• Check amplifier connectors, and wires for proper
connection
• If OK, check radio, refer to Radio Diagnosis
• If OK, replace amplifier
ELECTRICAL NOISE DISTORTION ONE
SPEAKER
• Remove output signal connector from amplifier
and check for short to ground on the speaker with
the distortion. Refer to Group 8W, Wiring Diagrams
for the appropriate pin numbers.
• If shorted to ground, disconnect speaker connec-
tor and recheck from the amplifier for short to
ground.
• If still shorted to ground, repair wires. Not
shorted to ground, replace speaker.
• Not shorted to ground, check speaker resistance
at amplifier connector for two to five ohms.
• If resistance is OK, refer to Radio Diagnosis. If
radio checks OK, replace amplifier.
• If resistance is less than two ohms, replace
speaker. If resistance is OK, repair wires.
MECHANICAL NOISE DISTORTION
• Check trim for loose parts, and speaker attach-
ments for buzzes.
• Remove speaker that is still connected and lis-
ten for distortion. If distortion remains, replace
speaker.
ONE SPEAKER NON-OPERATIVE
• Remove output signal connector from amplifier
and check for two to five ohms resistance to the non-
operative speaker. Refer to Group 8W, Wiring Dia-
grams for the appropriate pin numbers.
• If resistance is less than two ohms, test speaker
for resistance.
• If OK, repair wire. If not OK, replace speaker.
ALL SPEAKERS NON-OPERATIVE
• Check radio for being ON, are the display lights
on?
• Radio not ON, refer to Radio Diagnosis.
• Check fuses, amplifier connectors and wires for
proper connection.
• Check for good ground.
• Check amplifier, for battery voltage and
ON/OFF voltage.
(1) Battery voltage OK and NO voltage at the
ON/OFF terminal, check for short or open in the
ON/OFF circuit.
(2) ON/OFF voltage OK, and NO battery voltage,
check for short or open in battery circuit.
(3) Prior to replacing amplifier check fuse to the
cigar lighter and horn. If not OK, replace fuse. If fuse
blows again disconnect amplifier B+ wire connector.
Refer to Group 8W, Wiring Diagrams for the proper
connector.
(4) If fuse still blows the problem is not the ampli-
fier. If fuse does not blow replace the amplifier.
(5) If shorted or open circuit repair as necessary.
REAR WINDOW ANTENNA
NOTE: Due to a capacitor integral with the coaxial
cable, the coax cable can not be tested. The conti-
nuity test between the center pin of the coax to the
antenna does not apply. An ohm meter check to the
center pin of the coaxial cable will falsely indicate
an open circuit. The coaxial shield to ground test
can be performed. Verify coaxial cable performance
by using a known good cable.
Before performing any antenna service procedures,
verify that Rear Window Defogger is operating prop-
erly (Fig. 7) and (Fig. 8). If no, repair as necessary.
Refer to Group 8N, Electrically Heated Systems. Any
repairs to either the AM or FM grid should be pre-
formed as in Group 8N, Electrically Heated Systems,
Grid Line and Terminal Repair.
(1) Check that the rear window adhesive does not
come in contact with any portion of the grid lines or
Fig. 7 Rear Window Antenna Module
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AUDIO SYSTEMS
300M
DIAGNOSIS AND TESTING (Continued)
bus bars. There should be a minimum of 2 mm gap
between adhesive and the grid lines or bus bars. If
not OK, repair as necessary. If OK, go to Step 3.
(2) Check for proper radio coaxial cable connec-
tions at the radio and rear window antenna module.
If not OK, repair as necessary. If OK, go to Step 4.
(3) Loss of reception on only one band (AM or FM)
may indicate a continuity problem on the rear win-
dow grids. Test the grid lines with an ohmmeter. If
not OK, repair grid lines as necessary. If OK, go to
Step 5.
(4) Turn the radio and rear window defogger ON
position. Using a voltmeter, test for battery voltage
at the X60 and C15 circuit terminals of the rear win-
dow antenna module wire harness connector (Fig. 7).
If not OK, check fuses, if fuses are OK, repair wire
harness as necessary. Refer to Group 8W, Wiring Dia-
grams for circuit information.
(5) Ensure that the rear window defogger ground
wire with integral coil in the C-pillar has a good
ground.
(6) If not OK, repair as necessary. If OK, go to
Step 8.
CAUTION: Rear Window Defogger must be in the
OFF position
(7) Quick check of the module:
• Place the ignition switch in the ACC position
with the radio in the ON position on a appropriate
station (AM/FM).
• Tune to an AM station
• Using a grounded jumper wire, momentarily
short the AM lead to the grid lines (Fig. 8).
• There should be an audible CRACKLE through
the speakers indicating circuit continuity.
• Tune to an FM station
• Using a grounded jumper wire, momentarily
short the FM lead to the grid lines (Fig. 8).
• There should be an audible CRACKLE through
the speakers indicating circuit continuity.
If not OK, go to Step 9. If OK, go to Step 10.
(8) Using a ohmmeter, check continuity between
the module wire connector and:
• AM grid lines
• FM/rear window antenna grid lines
If not OK, repair necessary. Refer to Group 8N, Elec-
trically Heated Systems and Group 8W, Wiring Dia-
grams. If OK, go to Step 10.
(9) If neither AM or FM can be received, use a
known good radio and verify. If not OK, use a known
good antenna module and verify. If OK, either
exchange radio or replace antenna module.
REMOVAL AND INSTALLATION
DOOR MOUNTED SPEAKERS
CAUTION:
Do not operate the radio with speaker
leads detached. Damage to the output devices may
result.
REMOVAL - 6.5 INCH LOWER DOOR MOUNTED
SPEAKERS
(1) Open hood and disconnect the negative battery
cable remote terminal from the remote battery post
(Fig. 9).
(2) Open drivers door.
(3) Using a trim stick (special tool #C-4755), care-
fully pry speaker grille away from door trim panel
(Fig. 10).
(4) Remove two speaker retaining screws.
Fig. 8 Rear Window Grid Lines and Module
Fig. 9 Negative Battery Cable Remote Terminal
300M
AUDIO SYSTEMS
8F - 15
DIAGNOSIS AND TESTING (Continued)
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