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DN                                                                              ELECTRICALLY HEATED SYSTEMS                  8N - 1



                            ELECTRICALLY HEATED SYSTEMS
                                                  TABLE OF CONTENTS

                                                             page                                                              page

GENERAL INFORMATION                                                   DIAGNOSIS AND TESTING
 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . 1    DEFOGGER SYSTEM . . . . . . . . . . . . . . . . . . . . . . 2
 REAR WINDOW DEFOGGER SYSTEM . . . . . . . . . 1                       REAR GLASS HEATING GRID . . . . . . . . . . . . . . . 3
 HEATED MIRROR SYSTEM . . . . . . . . . . . . . . . . . 1              DEFOGGER SWITCH. . . . . . . . . . . . . . . . . . . . . . . 3
DESCRIPTION AND OPERATION                                             SERVICE PROCEDURES
 REAR GLASS HEATING GRID . . . . . . . . . . . . . . . 2               REAR GLASS HEATING GRID REPAIR. . . . . . . . . 4
 OUTSIDE MIRROR HEATING GRID . . . . . . . . . . . 2                  REMOVAL AND INSTALLATION
 DEFOGGER SWITCH. . . . . . . . . . . . . . . . . . . . . . . 2        DEFOGGER SWITCH. . . . . . . . . . . . . . . . . . . . . . . 5

GENERAL INFORMATION                                                   system. Refer to the owner's manual in the vehicle
                                                                      glove box for more information on the features, use
INTRODUCTION                                                          and operation of the defogger system.
   An electrically heated rear window defogger is
standard factory-installed equipment on this model.                   HEATED MIRROR SYSTEM
Electrically heated outside rear view mirrors are an                     The heated mirror system will only operate when
available factory-installed option on this model. Refer               the ignition switch is in the On position. When the
to 8W-48 - Rear Window Defogger and 8W-62 - Power                     rear window defogger switch is in the On position, an
Mirrors in Group 8W - Wiring Diagrams for complete                    electric heater grid located behind the glass of each
circuit descriptions and diagrams.                                    of the outside rear view mirrors is energized. When
                                                                      energized, each of these heater grids produce heat to
REAR WINDOW DEFOGGER SYSTEM                                           help clear the outside rear view mirrors of ice, snow,
   The rear window defogger system will only operate                  or fog.
when the ignition switch is in the On position. When                     The heated mirror system is controlled by a momen-
the defogger switch is in the On position, an electric                tary rear window defogger switch in the rear window
heater grid on the rear window glass is energized.                    switch pod installed in the instrument panel lower
The electric heater grid produces heat to help clear                  bezel, which also includes the switch for the rear wiper
the rear window glass of ice, snow, or fog.                           and washer system. An amber indicator lamp in the
   The defogger system is controlled by a momentary                   switch pod will light to indicate when the defogger sys-
switch in the rear window switch pod installed in the                 tem is turned on. The rear window switch pod also con-
instrument panel lower bezel, which also includes the                 tains the defogger system control circuitry including the
switch for the rear wiper and washer system. An                       timer logic and the defogger relay.
amber indicator lamp in the switch pod will light to                     The heated mirror system only operates in concert
indicate when the defogger system is turned on. The                   with the rear defogger system, and will be automat-
rear window switch pod also contains the defogger                     ically turned off after a programmed time interval of
system control circuitry including the timer logic and                about ten minutes. After the initial time interval has
the defogger relay.                                                   expired, if the defogger switch is turned on again
   The defogger system will be automatically turned                   during the same ignition cycle, the heated mirror
off after a programmed time interval of about ten                     system will automatically turn off after about five
minutes. After the initial time interval has expired, if              minutes.
the defogger switch is turned on again during the                        The heated mirror system will automatically shut
same ignition cycle, the defogger system will auto-                   off if the ignition switch is turned to the Off position,
matically turn off after about five minutes.                          or it can be turned off manually by depressing the
   The defogger system will automatically shut off if                 defogger switch a second time. Following are general
the ignition switch is turned to the Off position, or it              descriptions of the major components in the heated
can be turned off manually by depressing the defog-                   mirror system. Refer to the owner's manual in the
ger switch a second time. Following are general                       vehicle glove box for more information on the fea-
descriptions of the major components in the defogger                  tures, use and operation of the heated mirror system.
8N - 2    ELECTRICALLY HEATED SYSTEMS                                                                          DN


DESCRIPTION AND OPERATION                                   which is located near the center of the lower instru-
                                                            ment panel, below the heater and air conditioner con-
REAR GLASS HEATING GRID                                     trols.
   The heated rear window glass has two electrically           The rear window switch pod also contains the rear
conductive vertical bus bars and a series of horizon-       window defogger logic and timer circuitry, an amber
tal grid lines made of a silver-ceramic material,           defogger indicator lamp, the rear window defogger
which is baked on and bonded to the inside surface of       relay, and two switch illumination lamps. The indica-
the glass. The grid lines and bus bars comprise a           tor and illumination lamps in the switch pod use
parallel electrical circuit.                                incandescent bulbs, which can be serviced.
   When the rear window defogger switch is placed in           The momentary-type rear window defogger switch
the On position, electrical current is directed to the      provides a hard wired ground signal to the rear win-
rear window grid lines through the bus bars. The            dow defogger logic and timer circuitry, each time it is
grid lines heat the rear window to clear the surface        depressed. The rear window defogger timer and logic
of fog or snow. Protection for the heating grid circuit     circuitry responds by energizing or de-energizing the
is provided by a fuse in the Power Distribution Cen-        rear window defogger relay and the amber defogger
ter (PDC).                                                  indicator lamp, which lights to indicate when the
   The grid lines and bus bars are highly resistant to      defogger system is turned On. Energizing the rear
abrasion. However, it is possible for an open circuit       window defogger relay provides electrical current to
to occur in an individual grid line, resulting in no        the rear window defogger grid.
current flow through the line.                                 The rear window switch pod cannot be repaired. If
   The grid lines can be damaged or scraped off with        any function of the switch pod except lighting is
sharp instruments. Care should be taken when clean-         faulty or damaged, the entire switch pod must be
ing the glass or removing foreign materials, decals,        replaced.
or stickers from the glass. Normal glass cleaning sol-
vents or hot water used with rags or toweling is rec-       DIAGNOSIS AND TESTING
ommended.
   A repair kit is available to repair the grid lines and
                                                            DEFOGGER SYSTEM
bus bars, or to reinstall the heated glass terminals.
                                                               For circuit descriptions and diagrams, refer to
                                                            8W-48 - Rear Window Defogger in Group 8W - Wir-
OUTSIDE MIRROR HEATING GRID                                 ing Diagrams. The operation of the electrically
  Vehicles equipped with the optional heated mirror         heated rear window defogger system can be con-
system have an electric heating grid located behind         firmed in one of the following manners:
the mirror glass of each outside rear view mirror.             1. Turn the ignition switch to the On position.
The heated mirrors are controlled by the rear win-          While monitoring the instrument panel voltmeter, set
dow defogger switch. Electrical current is directed to      the defogger switch in the On position. When the
the heating grid inside the mirror only when the rear       defogger switch is turned On, a distinct voltmeter
window defogger switch is in the On position.               needle deflection should be noted.
  If the outside mirror heating grids are both inoper-         2. Turn the ignition switch to the On position. Set
ative, see Rear Window Defogger System in the Diag-         the defogger switch in the On position. The rear win-
nosis and Testing section of this group. If only one of     dow defogger operation can be checked by feeling the
the outside mirror heating grids is inoperative, see        rear window or outside rear view mirror glass. A dis-
Power Mirror System in the Diagnosis and Testing            tinct difference in temperature between the grid lines
section of Group 8T - Power Mirror Systems for diag-        and the adjacent clear glass or the mirror glass can
nosis of the outside mirror heating grid.                   be detected within three to four minutes of operation.
  The heating grid behind each outside mirror glass            3. Using a 12-volt DC voltmeter, contact the rear
cannot be repaired and, if faulty or damaged, the           glass heating grid terminal A (right side) with the
entire power mirror unit must be replaced. Refer to         negative lead, and terminal B (left side) with the pos-
Power Mirror in the Removal and Installation section        itive lead (Fig. 1). The voltmeter should read battery
of Group 8T - Power Mirror Systems for the service          voltage.
procedures.                                                    The above checks will confirm system operation.
                                                            Illumination of the defogger switch indicator lamp
DEFOGGER SWITCH                                             means that there is electrical current available at the
  The rear window defogger switch is integral to the        output of the rear window defogger logic and timer
rear window switch pod, which includes the rear             circuitry, but does not confirm that the electrical cur-
wiper and washer switches. The rear window switch           rent is reaching the rear glass heating grid lines.
pod is installed in the instrument panel lower bezel,
DN                                                                  ELECTRICALLY HEATED SYSTEMS             8N - 3
DIAGNOSIS AND TESTING (Continued)
                                                              (2) Using a 12-volt DC voltmeter, contact the ver-
                                                           tical bus bar on the right side of the vehicle with the
                                                           negative lead. With the positive lead, contact the ver-
                                                           tical bus bar on the left side of the vehicle. The volt-
                                                           meter should read battery voltage. If OK, go to Step
                                                           3. If not OK, repair the open circuit to the defogger
                                                           relay as required.
                                                              (3) With the negative lead of the voltmeter, contact
                                                           a good body ground point. The voltage reading should
                                                           not change. If OK, go to Step 4. If not OK, repair the
                                                           circuit to ground as required.
                                                              (4) Connect the negative lead of the voltmeter to
                                                           the right side bus bar and touch each grid line at
                                                           midpoint C with the positive lead. A reading of
                                                           approximately six volts indicates a line is good. A
           Fig. 1 Rear Window Glass Grid Test              reading of zero volts indicates a break in the grid
1   



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