Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Dodge Durango 1998-2000 Approved Dodge Durango 1998-99 98DN_8N
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DN ELECTRICALLY HEATED SYSTEMS 8N - 1
ELECTRICALLY HEATED SYSTEMS
CONTENTS
page page
GENERAL INFORMATION DEFOGGER SYSTEM . . . . . . . . . . . . . . . . . . . . . 2
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . 1 REAR GLASS HEATING GRID . . . . . . . . . . . . . . 2
REAR WINDOW DEFOGGER SYSTEM . . . . . . . . 1 SERVICE PROCEDURES
DESCRIPTION AND OPERATION REAR GLASS HEATING GRID REPAIR . . . . . . . . 3
DEFOGGER SWITCH . . . . . . . . . . . . . . . . . . . . . . 1 REMOVAL AND INSTALLATION
REAR GLASS HEATING GRID . . . . . . . . . . . . . . 1 DEFOGGER SWITCH . . . . . . . . . . . . . . . . . . . . . . 4
DIAGNOSIS AND TESTING
DEFOGGER SWITCH . . . . . . . . . . . . . . . . . . . . . . 3
GENERAL INFORMATION glove box for more information on the features, use
and operation of the defogger system.
INTRODUCTION
An electrically heated rear window defogger is
DESCRIPTION AND OPERATION
standard factory-installed equipment on this model.
Refer to 8W-48 - Rear Window Defogger in Group 8W
REAR GLASS HEATING GRID
- Wiring Diagrams for complete circuit descriptions
The heated rear window glass has two electrically
and diagrams.
conductive vertical bus bars and a series of horizon-
tal grid lines made of a silver-ceramic material,
REAR WINDOW DEFOGGER SYSTEM
which is baked on and bonded to the inside surface of
The rear window defogger system will only operate
the glass. The grid lines and bus bars comprise a
when the ignition switch is in the On position. When
parallel electrical circuit.
the defogger switch is in the On position, an electric
When the rear window defogger switch is placed in
heater grid on the rear window glass is energized.
the On position, electrical current is directed to the
The electric heater grid produces heat to help clear
rear window grid lines through the bus bars. The
the rear window glass of ice, snow, or fog.
grid lines heat the rear window to clear the surface
The defogger system is controlled by a momentary
of fog or snow. Protection for the heated grid circuit
switch in the rear window switch pod installed in the
is provided by a fuse in the Power Distribution Cen-
instrument panel lower bezel, which also includes the
ter (PDC).
switch for the rear wiper and washer system. An
The grid lines and bus bars are highly resistant to
amber indicator lamp in the switch pod will light to
abrasion. However, it is possible for an open circuit
indicate when the defogger system is turned on. The
to occur in an individual grid line, resulting in no
rear window switch pod also contains the defogger
current flow through the line.
system control circuitry including the timer logic and
The grid lines can be damaged or scraped off with
the defogger relay.
sharp instruments. Care should be taken when clean-
The defogger system will be automatically turned
ing the glass or removing foreign materials, decals,
off after a programmed time interval of about ten
or stickers from the glass. Normal glass cleaning sol-
minutes. After the initial time interval has expired, if
vents or hot water used with rags or toweling is rec-
the defogger switch is turned on again during the
ommended.
same ignition cycle, the defogger system will auto-
A repair kit is available to repair the grid lines and
matically turn off after about five minutes.
bus bars, or to reinstall the heated glass terminals.
The defogger system will automatically shut off if
the ignition switch is turned to the Off position, or it
DEFOGGER SWITCH
can be turned off manually by depressing the defog-
The rear window defogger switch is integral to the
ger switch a second time. Following are general
rear window switch pod, which includes the rear
descriptions of the major components in the defogger
wiper and washer switches. The rear window switch
system. Refer to the owner's manual in the vehicle
pod is installed in the instrument panel lower bezel,
which is located near the center of the lower instru-
8N - 2 ELECTRICALLY HEATED SYSTEMS DN
DESCRIPTION AND OPERATION (Continued)
ment panel, below the heater and air conditioner con-
trols.
The rear window switch pod also contains the rear
window defogger logic and timer circuitry, an amber
defogger indicator lamp, the rear window defogger
relay, and two switch illumination lamps. The indica-
tor and illumination lamps in the switch pod use
incandescent bulbs, which can be serviced.
The momentary-type rear window defogger switch
provides a hard wired ground signal to the rear win-
dow defogger logic and timer circuitry, each time it is
depressed. The rear window defogger timer and logic
circuitry responds by energizing or de-energizing the
rear window defogger relay and the amber defogger
indicator lamp, which lights to indicate when the
defogger system is turned On. Energizing the rear Fig. 1 Rear Window Glass Grid Test
window defogger relay provides electrical current to (1) Confirm that the ignition switch is in the On
the rear window defogger grid. position.
The rear window switch pod cannot be repaired. If (2) Ensure that the rear glass heating grid feed
any function of the switch pod except lighting is and ground wires are connected to the glass. Confirm
faulty or damaged, the entire switch pod must be that the ground wire has continuity to ground.
replaced. (3) Check the fuses in the Power Distribution Cen-
ter (PDC) and in the junction block. The fuses must
be tight in their receptacles and all electrical connec-
DIAGNOSIS AND TESTING
tions must be secure.
When the above steps have been completed and the
DEFOGGER SYSTEM
rear glass heating grid is still inoperative, one or
For circuit descriptions and diagrams, refer to
more of the following is faulty:
8W-48 - Rear Window Defogger in Group 8W - Wir-
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