Chrysler New Yorker. Manual — part 99
ton operation. Note this does not check the EBL sys-
tem. There are no fault codes that can check for the
EBL grid, relay, or wiring. Refer to steps 2 and 3 for
system test.
(2) Perform system test with voltmeter.
Check voltages at rear grid relay and refer to Rear
Widow Defogger Relay Test table.
A/C-HEATER AND ATC CONTROL HEAD
Refer to Group 24, Heating and Air Conditioning
for instructions on how to use the DRB lll scan tool
or the control head self-diagnostics to test the part.
The problem is not with the control head if no trou-
ble codes are found. The next step should be to check
the rest of the system after the A/C-Heater or ATC
control is checked.
SYSTEM TEST
(1) Start engine. With the engine running, push
the Rear Window Defogger button on the ATC or
Manual A/C Heater Control Head. The button LED
indicator should light. If the EBL indicator does not
light on the MANUAL-A/C HEATER CONTROL,
then there may be a wiring problem. This may also
indicate that the BCM will not complete the circuit
to ground that is required to energize the EBL relay
coil (non-ATC vehicles only). Refer to EBL Relay
Test. On ATC vehicles, the LED indicator may light
when the BCM failed to complete the circuit to
ground required to energize the EBL relay coil.
(2) Using a DC voltmeter with a 0-15 volt range,
connect the negative lead to a known good vehicle
electrical ground.
(3) Touch the positive bus bar and check voltage.
The voltage should be above 11 volts. Push the Rear
Window Defogger button to turn off the indicator.
The measured voltage should be 0 volts. If these volt-
ages are correct then the problem is with the Rear
Window Grid or Grid ground electrical connection. Go
to the Grid Lines test to check the Grid and ground
connection.. If there is no voltage to the rear window
defogger grid when the system is ON, then go to the
Fuse and Electrical Short Test.
GRID TEST
The horizontal grid line and vertical bus bar line is
printed and fired on the inside surface of the rear
window glass. These comprise and electrical circuit.
The electrically conductive lines are composed of a
silver ceramic material which when fired on glass
becomes bonded to the glass and is highly resistant
to abrasion. It is possible, however, that a break may
occur in and individual grid line resulting in no cur-
rent flow through the line. To detect breaks in grid
lines, the following procedure is required:
(1) Stop the engine. Connect the negative lead of a
0-25 volt range voltmeter to a known good vehicle
electrical ground.
(2) Start the engine and push the rear window
defogger button to turn on the system.
(3) Touch the ground side (point B) of the Rear
Window Defogger Grid. The voltage measured should
be below 1 volt. If the voltage is greater than 1 volt
then check the voltage on each grid line at the Mid-
Point with the positive lead. If the voltage is not
approximately 6 volts or half the voltage measured
on the positive rear window grid bus bar, then the
grid line is bad. The break in the grid can be found
by moving the probe along the line until the voltage
changes. The area where the voltage changes is
where the open circuit is.
Fig. 2 System Electrical Circuit
Fig. 3 Grid Line Test
8N - 2
ELECTRICALLY HEATED SYSTEMS
LH
DIAGNOSIS AND TESTING (Continued)
FUSE AND ELECTRICAL SHORT TEST
(1) Stop engine.
(2) Check the fuse supplying power to the rear
glass grid relay. If the fuse is good, then go to the
Rear Window Defogger Relay test. If the fuse is open,
then go to Step 4.
(3) Locate the ground lug that connects the nega-
tive lead of the rear window grid to ground. Remove
the screw holding the ground lug and isolate it from
any vehicle ground.
(4) Connect one lead of an ohmmeter to the nega-
tive ground lug of the rear window grid (with the lug
still not connected to a vehicle ground), and check
the resistance to a known good vehicle ground. If the
ohmmeter indicates less than 10 ohms, then the rear
window defogger grid is shorting to the vehicle
ground and must be replaced. If the ohmmeter indi-
cates more than 100 ohms of resistance, then go to
Step 7.
(5) Disconnect the rear window defogger grid volt-
age feed wire from the vehicle harness. If the ohm-
meter still indicates less than 10 ohms, then the rear
window defogger grid is shorting to the vehicle
ground and must be replaced. If the ohmmeter indi-
cats more than 100 ohms of resistance, then go to
Step 7.
(6) There is a problem with the circuits that con-
nect to the rear window defogger relay. Refer to
Group 8W, Wiring Diagrams for circuit descriptions.
Check wiring with an ohmmeter to verify proper wir-
ing connections to the rear window defogger relay. If
no problems are found, then replace the fuse and try
running the system.
REAR WINDOW DEFOGGER RELAY
(1) Stop engine. Connect the negative lead of a
0-15 volt range voltmeter to a known good vehicle
electrical ground.
(2) Reconnect rear window grid connections discon-
nected during the Fuse and Electrical Short Test.
Start engine and with the system OFF, check the
voltages present at the rear window defogger relay
and rear window defogger grid. Refer to the Rear
Window Defogger Relay Test table for diagnosis.
LH
ELECTRICALLY HEATED SYSTEMS
8N - 3
DIAGNOSIS AND TESTING (Continued)
REAR WINDOW DEFOGGER RELAY TEST
POTENTIAL PROBLEM
SYSTEM
ON OR OFF
WITH
ENGINE
RUNNING
VOLTAGE AT REAR WINDOW
DEFOGGER RELAY POINT TO
GOOD VEHICLE GROUND
VOLTAGE AT
REAR WINDOW
DEFOGGER
GRID TO GOOD
VEHICLE
GROUND
1
2
3
4
A
B
NO PROBLEM. VOLTAGES AS
EXPECTED WITH THE SYSTEM
OFF.
OFF
MORE
THAN
11
MORE
THAN
11
0
MORE
THAN
11
0
0
NO PROBLEM. VOLTAGES AS
EXPECTED WITH THE SYSTEM
ON.
ON
MORE
THAN
11
MORE
THAN
11
MORE
THAN
11
LESS
THAN
1.0
MORE
THAN
11
LESS
THAN
1.0
RELAY CONTACTS NOT CLOSING.
REPLACE RELAY.
ON
MORE
THAN
11
MORE
THAN
11
0
LESS
THAN
1.0
0
0
WIRING OPEN BETWEEN BODY
CONTROL MODULE AND REAR
WINDOW DEFOGGER RELAY, OR,
DEFECTIVE BODY CONTROL
MODULE.
ON
MORE
THAN
11
MORE
THAN
11
0
MORE
THAN
11
0
0
POOR CONNECTION BETWEEN
PIN 3 OF RELAY AND POSITIVE
CONNECTION ON REAR WINDOW
DEFOGGER GRID CIRCUIT.
ON
MORE
THAN
11
MORE
THAN
11
MORE
THAN
11
LESS
THAN
1.0
0
0
POOR CONNECTION TO GROUND
ON NEGATIVE SIDE OF REAR
WINDOW DEFOGGER GRID.
ON
MORE
THAN
11
MORE
THAN
11
MORE
THAN
11
LESS
THAN
1.0
MORE
THAN
11
MORE
THAN
11
POOR WIRING CONNECTION
BETWEEN PINS 1 TO 2 OF THE
REAR WINDOW DEFOGGER
RELAY.
ON
MORE
THAN
11
0
0
0
0
0
OPEN FUSE OR OPEN WIRING
CONNECTION TO PIN 1 OF REAR
WINDOW DEFOGGER RELAY.
ON
0
0
0
0
0
0
RELAY CONTACTS SHORTED.
REPLACE RELAY. REAR WINDOW
DEFOGGER WILL NOT TURN OFF.
OFF
MORE
THAN
11
MORE
THAN
11
MORE
THAN
11
MORE
THAN
11
MORE
THAN
11
0
8N - 4
ELECTRICALLY HEATED SYSTEMS
LH
DIAGNOSIS AND TESTING (Continued)
SERVICE PROCEDURES
REPAIR GRID LINES, TERMINALS AND PIGTAILS
The repair of the grid lines or the terminal is pos-
sible using the Mopar
t Repair Package or equivalent.
(1) Mask repair area so conductive epoxy can be
extended onto the line or the bus bar (Fig. 4).
(2) Follow instructions in repair kit for preparing
damaged area.
(3) Remove package separator clamp and mix plas-
tic conductive epoxy thoroughly. Fold in half and cut
center corner to dispense epoxy.
(4) For grid line, mark off area to be repaired with
masking tape or a template (Fig. 4).
(5) Apply conductive epoxy through slit in masking
tape. Overlap both ends of the break by 19 mm (3/4
inch).
(6) For a terminal or pigtail replacement, mask
adjacent areas so epoxy can be extended onto line as
well as bus bar. Apply a thin layer of epoxy to area
where terminal was fastened and to adjacent line.
(7) Apply a thin layer of conductive epoxy on ter-
minal and place terminal on desired location. To pre-
vent terminal from moving while the epoxy is curing,
it must be wedged or clamped.
(8) Carefully remove masking tape from grid line.
CAUTION:
Do not allow the glass surface to
exceed 204°C (400°F), glass may fracture.
(9) Allow epoxy to cure 24 hours at room tempera-
ture or use heat gun with a 260°-371°C (500°-700°F)
range for 15 minutes. Hold gun approximately 254
mm (10 inches) from repaired area.
(10) After conductive epoxy is properly cured
remove wedge from terminal and check out operation
of rear window defogger. Do not attach connectors
until curing is complete.
WARNING:
REPAIR KIT MAY CAUSE SKIN OR EYE
IRRITATION. CONTAINS EPOXY RESIN AND AMINE
TYPE
HARDENER,
HARMFUL
IF
SWALLOWED.
AVOID CONTACT WITH SKIN AND EYES. FOR SKIN,
WASH AFFECTED AREAS WITH SOAP AND WATER.
DO NOT TAKE INTERNALLY. IF TAKEN INTER-
NALLY, INDUCE VOMITING; CALL A PHYSICIAN
IMMEDIATELY. IF IN CONTACT WITH EYES, FLUSH
WITH PLENTY OF WATER. USE WITH ADEQUATE
VENTILATION. DO NOT USE NEAR FIRE OR FLAME.
CONTENTS CONTAIN 3 PERCENT FLAMMABLE
SOLVENTS.
KEEP OUT OF REACH OF CHILDREN.
REMOVAL AND INSTALLATION
HEATER-A/C ATC CONTROL
Refer to Group 8E, Instrument Panel and Systems
for proper Removal and Installation procedures.
REAR WINDOW DEFOGGER RELAY
REMOVAL
(1) Disconnect battery negative remote cable from
remote ground post (Fig. 5).
(2) Open trunk. Reach behind trunk carpet and
pull out on relay.
(3) Remove relay from vehicle.
INSTALLATION
For installation, reverse the above procedures.
Fig. 4 Grid Line Repair
Fig. 5 Negative Battery Cable Remote Terminal
LH
ELECTRICALLY HEATED SYSTEMS
8N - 5
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