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8G - 4
HEATED GLASS SYSTEM
REAR WINDOW DEFOGGER SWITCH (Continued)
Refer to Wiring Diagrams for complete circuit
diagrams.
REAR WINDOW DEFOGGER
GRID LINES
DIAGNOSIS AND TESTING – REAR WINDOW
DEFOGGER GRID LINES
The horizontal grid lines and vertical bus bar lines
printed and fired on inside surface of rear window
glass comprise an electrical parallel circuit. The elec-
trically conductive lines are composed of a silver-ce-
ramic material which when fired on glass becomes
bonded to the glass and is highly resistant to abra-
sion. It is possible, however, that a break may occur
in an individual grid line resulting in no current flow
through the line. To detect breaks in grid lines the
following procedure is required:
(1) Turn ignition switch to the ON position.
Depress the control switch button to ON position.
The indicator light should come on.
(2) Using a DC voltmeter with 0-15 volt range,
contact the ground terminal with negative lead of
voltmeter. With positive lead of voltmeter, contact
feed terminal. The voltmeter should read 10-14 volts.
A lower voltage reading indicates a poor ground con-
nection.
(3) Connect the negative lead of voltmeter to a
good body ground point. The voltage reading should
not be more than two tenth of a volt difference. If
more than two tenth of a volt repair the ground cir-
cuit.
(4) Connect negative lead of voltmeter to ground
terminal and touch each grid line at Mid-Point with
Positive lead. A reading of approximately 6 volts indi-
cates a line is good. A reading of 0 volts indicates a
break in line between Mid-Point and feed terminal. A
reading of 10-14 volts indicates a break between Mid-
Point and ground terminal. Move toward break and
voltage will change as soon as break is crossed. Refer
to Wiring Diagrams for circuit information.
STANDARD PROCEDURE - REAR WINDOW
DEFOGGER GRID LINE REPAIR
WARNING: THE REPAIR KIT MAY CAUSE SKIN OR
EYE IRRITATION. THE KIT CONTAINS EPOXY RESIN
AND AMINE TYPE HARDENER AND HARMFUL:
• DO NOT TAKE INTERNALLY, IF SWALLOWED
INDUCE VOMITING AND CALL A PHYSICIAN IMME-
DIATELY.
• IF SKIN CONTACT OCCURS, WASH AFFECTED
AREAS WITH SOAP AND WATER.
•
IF EYE CONTACT OCCURS, FLUSH WITH
PLENTY OF WATER.
USE WITH ADEQUATE VENTILATION. DO NOT USE
NEAR FIRE OR OPEN FLAME THE CONTENTS
CONTAIN FLAMMABLE SOLVENTS. KEEP OUT OF
REACH OF CHILDREN.
The repair of the grid lines or the terminal is pos-
sible using the Mopar Grid Line Repair Package or
equivalent.
(1) Mask repair area so conductive epoxy can be
extended onto the line or the bus bar (Fig. 3).
(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) Apply conductive epoxy through slit in masking
tape. Overlap both ends of the break by 19 mm (3/4
inch).
(5) 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.
(6) 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.
(7) Carefully remove masking tape from grid line.
CAUTION: Do not allow the glass surface to exceed
204°C (400°F), glass may fracture.
(8) Allow epoxy to cure 24 hours at room tempera-
ture or use heat gun with a 260° to 371°C (500° to
700°F) range for 15 minutes. Hold gun approximately
254 mm (10 inches) from repaired area.
(9) 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.
Fig. 3 Grid Line Repair
1 - BREAK
2 - GRID LINE
3 - MASKING TAPE
JR
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