Chrysler 2004 Concorde Service Manual page 236

8A - 10 AUDIO/VIDEO
REAR WINDOW ANTENNA MODULE (Continued)
Before performing any antenna service procedures,
verify that Rear Window Defogger is operating prop-
erly (Fig. 8) and (Fig. 9). If no, repair as necessary.
(Refer to 8 - ELECTRICAL/HEATED GLASS - DIAG-
NOSIS AND TESTING). Any repairs to either the
AM or FM grid should be preformed as in Electri-
cally Heated Systems, Grid Line and Terminal
Repair.
Fig. 8 Rear Window Antenna Module
1 - TO FM/DEFOGGER GRID LINES
2 - RADIO COAX CONNECTOR
3 - 12 VOLT FEED TO REAR WINDOW DEFOGGER
4 - 12 VOLT FEED TO MODULE
5 - TO AM GRID LINES
Fig. 9 Rear Window Grid Lines and Module
1 - B+ FOR AMPLIFIER
2 - B+ FOR REAR WINDOW DEFOGGER
3 - AM
4 - FM & REAR WINDOW DEFOGGER
5 - RADIO COAX
(1) Check that the rear window adhesive does not
come in contact with any portion of the grid lines or
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 2.
(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 3.
(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) Reception degradation when the rear window
defogger is actuated may indicate discontinuity in
the heated grid lines.
(5) 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. 8).
If not OK, check fuses, if fuses are OK, repair wire
harness as necessary. Refer to Wiring Diagrams for
circuit information.
(6) Ensure that the rear window defogger ground
wire with integral coil in the C-pillar has a good
ground.If not OK, repair as necessary. If OK, go to
Step 7.
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 a AM station
• Using a grounded jumper wire, momentarily
short the AM lead to the grid lines (Fig. 9).
• There should be an audible CRACKLE through
the speakers indicating circuit continuity.
• Tune to a FM station
• Using a grounded jumper wire, momentarily
short the FM lead to the grid lines (Fig. 9).
• There should be an audible CRACKLE through
the speakers indicating circuit continuity.
If not OK, go to Step 8. If OK, go to Step 9.
(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 as necessary. (Refer to 8 - ELEC-
TRICAL/HEATED GLASS - DIAGNOSIS AND TEST-
ING). If OK, go to Step 9.
(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.
LH