nal B (driver side) with the positive lead. The volt-
meter should read 10-14 volts.
Steps 3, 4 or 5 above will confirm system operation.
Indicator light illumination means that there is
power available at the output of the switch, but does
not confirm that power is reaching the rear window
grid lines.
If the rear window defogger does not operate, the
problem should be isolated in the following manner:
(1) Confirm that ignition switch is in ON position.
(2) Ensure that the heated rear window feed and
ground wires are connected to the glass. Confirm
that the ground wire has continuity to ground.
(3) Check fuses 8 and 18 (XJ), or fuses 6 and 9
(YJ) in fuseblock module. Fuses must be tight in
their receptacles and all electrical connections must
be secure.
When the above steps have been completed and the
system is still inoperative, one or more of the follow-
ing is faulty:
²defogger switch²relay/timer
²rear window grid lines (all grid lines would have
to be broken or one of the feed wires disconnected for
the entire system to be inoperative).
If turning the switch ON produces severe voltmeter
deflection, check for a short circuit.
REAR WINDOW GLASS GRID
To detect breaks in grid lines, the following proce-
dure is required:
(1) Turn ignition switch to the ON position. Turn
rear defogger switch ON. The indicator lamp should
light.
(2) Using a 12-volt DC voltmeter, contact vertical
bus bar on passenger side of vehicle (point A of Fig.
1) with negative lead of voltmeter. With positive lead
of voltmeter, contact vertical bus bar on driver side of
vehicle (point B of Fig. 1). The voltmeter should read
10-14 volts.
(3) With negative lead of voltmeter, contact a good
body ground point. The voltage reading should not
change. A different reading indicates a poor ground
connection.
(4) Connect negative lead of voltmeter to point A
on passenger side bus bar and touch each grid line at
mid-point with positive lead. A reading of approxi-
mately 6 volts indicates a line is good. A reading of
zero volts indicates a break in the grid line between
mid-point C and point B. A reading of 10-14 volts in-
dicates a break between mid-point C and point A.
Move toward break and voltage will change as soon
as break is crossed.
Fig. 1 Rear Window Glass Grid Test
8N - 2 REAR WINDOW DEFOGGERJ
STATIONARY GLASS WATER LEAK DETECTION
AND REPAIRÐYJ
The sources of water leaks around windshield/win-
dow glass can be sealed without removing the wind-
shield/window glass. If the glass is firmly bonded and
only has a small leak, seal areas with a liquid butyl
sealant. However, if weatherstrip seal or urethane
sealant has large breaks, a urethane sealant must be
used.
LEAK TEST
Water test the windshield/window with a spray
only.Do not use hard streams of water.Work
from the bottom to the top of the windshield/window.
Water test the windshield/window with a spray
only.Do not use hard streams of water.Work
from the bottom to the top of the windshield/window
glass.
If a water leak exists between the glass and weath-
erstrip seal (or between the seal and a body flange):
²Push the glass outward at the leak area, and de-
termine the extent of the gap.
Push the glass outward while a helper sprays the
windshield/window glass with water.
SEALING MINOR LEAK AREAS
(1) Thoroughly clean and remove all foreign mate-
rial from the leak area. Dry the area with com-
pressed air.
(2) Seal the leak area with butyl sealant. Allow the
sealant to cure for at least 1/2 hour. Next, water test
the glass to ensure that the leak area is sealed.
SEALING MAJOR LEAK AREAS
(1) Thoroughly clean the leak area.
(2) As applicable, apply primer to either glass or
weatherstrip seal leak area. Use blackout primer on
the glass and urethane primer on the weatherstrip
seal.
(3) Apply urethane to the leak area. Use an adhe-
sive cartridge with a pointed nozzle.
(4) Water test glass immediately with cold water
spray. Allow the water to spill over the edge of glass
and weatherstrip seal.
(5) Apply additional adhesive, if necessary.
(6) Remove any excess adhesive.
23 - 150 STATIONARY GLASSÐYJJ
