Jeep Wrangler TJ. Manual - part 291

DIAGNOSIS AND TESTING

REAR WINDOW DEFOGGER SWITCH

WARNING: On vehicles equipped with airbags, dis-
able the airbag system before attempting any steer-
ing wheel, steering column, or instrument panel
component diagnosis or service. Disconnect and
isolate the battery negative (ground) cable, then
wait two minutes for the airbag system capacitor to
discharge before performing further diagnosis or
service. Failure to take the proper precautions
could result in accidental airbag deployment and
possible personal injury or death.

NOTE: For circuit descriptions and diagrams, refer
to Rear Window Defogger in Group 8W - Wiring Dia-
grams.

(1) Disconnect and isolate the negative battery

cable. Remove the accessory switch bezel from the
instrument panel and disconnect the wire harness
connector from the defogger switch.

(2) Check for continuity between the ground cir-

cuit cavity of the defogger switch wire harness con-
nector

and

good

ground.

There

should

continuity. If OK, go to Step 3. If not OK, repair the
open circuit as required.

(3) Check for continuity between the ground cir-

cuit terminal and the rear window defogger switch
sense circuit terminal on the back of the defogger
switch housing (Fig. 7). There should be momentary
continuity as the defogger switch is pressed, and
then no continuity. If OK, test the instrument cluster
(Refer to 8 - ELECTRICAL/INSTRUMENT CLUS-
TER - DIAGNOSIS AND TESTING). If not OK,
replace the faulty rear window defogger switch (Refer
to 8 - ELECTRICAL/HEATED GLASS/REAR WIN-
DOW DEFOGGER SWITCH - REMOVAL).

REMOVAL

(1) Disconnect and isolate the negative battery

cable.

(2) Remove the center bezel from the instrument

panel (Refer to 23 - BODY/INSTRUMENT PANEL/
CLUSTER BEZEL - REMOVAL).

(3) Remove the four screws that secure the acces-

sory switch bezel to the instrument panel (Fig. 8).

(4) Pull the accessory switch bezel out from the

instrument panel far enough to access the wire har-
ness connectors.

(5) Disconnect the wire harness connectors from

the rear of the accessory switches and the cigar light-
er/power outlet.

(6) Remove the accessory switch bezel from the

instrument panel.

(7) Using a small thin-bladed screwdriver, gently

pry the snap clips at the top and at the bottom of the
rear window defogger switch receptacle on the back
of the accessory switch bezel and pull the switch out
of the bezel.

INSTALLATION

(1) Install the rear window defogger switch into

the back of the accessory switch bezel by pushing the
switch firmly into the bezel.

(2) Connect the wire harness connectors to the

rear of the accessory switches and the cigar lighter/
power outlet.

(3) Install the accessory switch bezel to the instru-

ment panel.

Fig. 7 Rear Window Defogger Switch Continuity

SWITCH POSITION

CONTINUITY BETWEEN

OFF

LAMPS

MOMENTARY 1 AND 2

ILLUMINATION LAMP

1 AND 4

INDICATOR LAMP

1 AND 3

HEATED GLASS

8G - 5

REAR WINDOW DEFOGGER SWITCH (Continued)

(4) Install the four screws that secure the acces-

sory switch bezel to the instrument panel. Tighten
the screws to 2 N·m (17 in. lbs.).

(5) Install the center bezel to the instrument panel

(Refer to 23 - BODY/INSTRUMENT PANEL/CLUS-
TER BEZEL - INSTALLATION).

(6) Reconnect the negative battery cable.

REAR WINDOW DEFOGGER
GRID

STANDARD PROCEDURE

GRID LINE AND TERMINAL REPAIR

WARNING: Materials contained in the Repair Kit (Part
Number 04549275) may cause skin or eye irritation.
The kit contains epoxy resin and amine type hardener,
which are harmful if swallowed. Avoid contact with the
skin and eyes. For skin contact, wash the affected
areas with soap and water. For contact with the eyes,
flush with plenty of water. Do not take internally. If
taken internally, induce vomiting and call a physician
immediately. Use with adequate ventilation. Do not use
near fire or flame. Contains flammable solvents. Keep
out of the reach of children. Failure to follow the warn-
ings could result in possible personal injury or death.

Repair of the rear glass heating grid lines, bus

bars or terminals can be accomplished using the
Mopar

t Rear Window Defogger Repair Kit (Part

Number 04549275) or equivalent.

(1) Mask the repair area with masking tape so

that the conductive epoxy can be applied neatly (Fig.

9). Extend the epoxy application onto the grid line or
the bus bar on each side of the break.

(2) Follow the instructions in the repair kit for

preparing the damaged area.

(3) Remove the package separator clamp and mix

the two conductive epoxy components thoroughly
within the packaging. Fold the package in half and
cut the center corner to dispense the epoxy.

(4) For grid line repairs, mask the area to be

repaired with masking tape or use a template.

(5) Apply the epoxy through the slit in the mask-

ing tape or template. Overlap both ends of the break
by at least 19 millimeters (0.75 inch).

(6) For a terminal replacement, mask the adjacent

areas so the epoxy can be extended onto the adjacent
grid line as well as the bus bar. Apply a thin layer of
epoxy to the area where the terminal was fastened
and onto the adjacent grid line.

(7) Apply a thin layer of conductive epoxy to the

terminal and place it in the proper location on the
bus bar. To prevent the terminal from moving while
the epoxy is curing, it must be wedged or clamped.

(8) Carefully remove the masking tape or template.

CAUTION: Do not allow the glass surface to exceed
204° C (400° F) or the glass may fracture.

(9) Allow the epoxy to cure 24 hours at room tem-

perature, or carefully use a heat gun for fifteen min-
utes. When using a heat gun, hold it approximately
25.4 centimeters (10 inches) from the repair and do
not allow the glass surface to exceed 204° C (400° F).

NOTE: Do not attach the wire harness connectors to
the terminals until the curing process is complete.

(10) After the conductive epoxy is properly cured,

remove the wedge or clamp from the terminal.

(11) Connect the wire harness leads to the grid

terminals and verify EBL operation.

Fig. 9 Grid Line Repair

1 - BREAK
2 - GRID LINE
3 - MASKING TAPE

Fig. 8 Accessory Switch Bezel

1 - BEZEL SCREWS (4)
2 - BEZEL
3 - WIRE HARNESS
4 - ELECTRICAL CONNECTORS (7)

8G - 6

HEATED GLASS

REAR WINDOW DEFOGGER SWITCH (Continued)

HEATED MIRRORS

TABLE OF CONTENTS

page

HEATED MIRRORS

DESCRIPTION

. . . . . . . . . . . . . . . . . . . . . . . . . . 7

OPERATION

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

HEATED MIRRORS

DESCRIPTION

The optional heated mirror system is controlled by

the momentary rear window defogger switch located
in the accessory switch bezel (Fig. 1). An amber indi-
cator lamp in the switch will illuminate to indicate
when the rear window defogger (EBL) system is
turned on.

The heated mirror system only operates in concert

with the EBL system, and will be automatically shut
off after a programmed time interval of about ten
minutes. After the initial time interval has expired, if
the defogger switch is pressed again during the same
ignition cycle, the heated mirror system will auto-
matically shut off after about five minutes.

The heated mirror system will automatically shut

off if the ignition switch is turned to the Off position,
or it can be shut off manually by pressing the rear
window defogger switch a second time.

OPERATION

When the rear window defogger switch is pressed,

the rear window defogger (EBL) system becomes acti-
vated and an electric heater grid located behind the
glass of each of the outside rear view mirrors is ener-
gized. When energized, each of these heater grids
produce heat to help clear the outside rear view mir-
rors of ice, snow, or fog.

If the outside mirror heating grids are both inoper-

ative, refer to DIAGNOSIS AND TESTING - REAR

WINDOW DEFOGGER SYSTEM in his group. If
only one of the outside mirror heating grids is inop-
erative, refer to 8 - ELECTRICAL/POWER MIR-
RORS - DIAGNOSIS AND TESTING.

The heating grid behind each outside mirror glass

cannot be repaired and, if faulty or damaged, the
entire power mirror assembly must be replaced.

Fig. 1 Accessory Switch Bezel - Typical

1 - BEZEL SCREWS (4)
2 - BEZEL
3 - WIRE HARNESS
4 - ELECTRICAL CONNECTORS (7)

HEATED MIRRORS

8G - 7

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