Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Dodge Dakota 2000-2001.2003.2005 Approved Dodge Dakota 2000 00AN_8N
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AN 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 expired, if the rear window defogger switch is turned
on again during the same ignition cycle, the defogger
INTRODUCTION system will be automatically turned off after about
An electrically heated rear window defogger is an five minutes.
available factory-installed option on quad cab ver- The rear window defogger system will automati-
sions of this model. Electrically heated outside rear cally shut off if the ignition switch is turned to the
view mirrors are an available factory-installed option Off position, or it can be turned off manually by
on quad cab models that are also equipped with the depressing the rear window defogger switch a second
electrically heated rear window defogger. Refer to time while the system is turned on. Following are
8W-48 - Rear Window Defogger and 8W-62 - Power general descriptions of the major components in the
Mirrors in Group 8W - Wiring Diagrams for complete rear window defogger system. Refer to the owner's
circuit descriptions and diagrams. manual in the vehicle glove box for more information
on the features, use and operation of the rear win-
REAR WINDOW DEFOGGER SYSTEM dow defogger system.
The rear window defogger system is an available
option on quad cab versions of this model. The rear HEATED MIRROR SYSTEM
window defogger system will only operate when the The heated mirror system is available on quad cab
ignition switch is in the On position. When the defog- models of this vehicle that are also equipped the
ger switch is in the On position, an electric heater optional rear window defogger system. The heated
grid on the rear window glass is energized. Vehicles mirror system will only operate when the ignition
with the heated mirrors option also have heater grids switch is in the On position. When the rear window
located behind the outside rear view mirror glass. defogger switch is in the On position, an electric
Each of these grids produce heat to help clear the heater grid located behind the glass of each of the
rear window glass and outside rear view mirrors of outside rear view mirrors is energized. When ener-
ice, snow, or fog. The electric heater grid produces gized, each of these heater grids produce heat to help
heat to help clear the rear window glass of ice, snow, clear the outside rear view mirrors of ice, snow, or
or fog. fog.
The rear window defogger system is controlled by a The heated mirror system is controlled by a
momentary rear window defogger switch located in momentary rear window defogger switch located in
the instrument panel lower bezel. An amber indicator the instrument panel lower bezel. An amber indicator
lamp in the switch bezel will light to indicate when lamp in the switch bezel will light to indicate when
the defogger system is turned on. The rear window the defogger system is turned on. The rear window
defogger switch also contains the defogger system defogger switch also contains the rear window defog-
control circuitry including the timer logic and the ger system control circuitry including the timer logic
defogger relay. and the defogger relay.
The rear window defogger system will be automat- The heated mirror system only operates in concert
ically turned off after a programmed time interval of with the rear window defogger system, and will be
about ten minutes. After the initial time interval has automatically turned off after a programmed time
8N - 2 ELECTRICALLY HEATED SYSTEMS AN
GENERAL INFORMATION (Continued)
interval of about ten minutes. After the initial time the outside mirror heating grids is inoperative, see
interval has expired, if the rear window defogger Power Mirror System in the Diagnosis and Testing
switch is turned on again during the same ignition section of Group 8T - Power Mirror Systems for diag-
cycle, the heated mirror system will automatically nosis of the outside mirror heating grid.
turn off after about five minutes. The heating grid behind each outside mirror glass
The heated mirror system will automatically shut cannot be repaired and, if faulty or damaged, the
off if the ignition switch is turned to the Off position, entire power mirror unit must be replaced. Refer to
or it can be turned off manually by depressing the Power Mirror in the Removal and Installation section
rear window defogger switch a second time while the of Group 8T - Power Mirror Systems for the service
system is turned on. Following are general descrip- procedures.
tions of the major components in the heated mirror
system. Refer to the owner's manual in the vehicle DEFOGGER SWITCH
glove box for more information on the features, use The rear window defogger switch is installed in the
and operation of the heated mirror system. instrument panel lower bezel, which is located near
the center of the lower instrument panel, below the
heater and air conditioner controls. The rear window
DESCRIPTION AND OPERATION switch pod also contains the rear window defogger
logic and timer circuitry, an amber defogger indicator
REAR GLASS HEATING GRID lamp, the rear window defogger relay and a switch
The heated rear window glass has two electrically illumination lamp. The indicator and illumination
conductive vertical bus bars and a series of horizon- lamps in the switch have incandescent bulbs, which
tal grid lines made of a silver-ceramic material, can be serviced.
which is baked on and bonded to the inside surface of The momentary-type rear window defogger switch
the glass. The grid lines and bus bars comprise a provides a hard wired ground signal to the rear win-
parallel electrical circuit. dow defogger logic and timer circuitry, each time it is
When the rear window defogger switch is placed in depressed. The rear window defogger timer and logic
the On position, electrical current is directed to the circuitry responds by energizing or de-energizing the
rear window grid lines through the bus bars. The rear window defogger relay and the amber defogger
grid lines heat the rear window to clear the surface indicator lamp, which lights to indicate when the
of fog or snow. Protection for the heating grid circuit defogger system is turned On. Energizing the rear
is provided by a fuse in the Power Distribution Cen- window defogger relay provides electrical current to
ter (PDC). the rear window defogger grid.
The grid lines and bus bars are highly resistant to The rear window defogger switch cannot be
abrasion. However, it is possible for an open circuit repaired. If any function of the switch except lighting
to occur in an individual grid line, resulting in no is faulty or damaged, the entire switch unit must be
current flow through the line. replaced.
The grid lines can be damaged or scraped off with
sharp instruments. Care should be taken when clean-
ing the glass or removing foreign materials, decals, DIAGNOSIS AND TESTING
or stickers from the glass. Normal glass cleaning sol-
vents or hot water used with rags or toweling is rec- DEFOGGER SYSTEM
ommended. For circuit descriptions and diagrams, refer to
A repair kit is available to repair the grid lines and 8W-48 - Rear Window Defogger in Group 8W - Wir-
bus bars, or to reinstall the heated glass terminals. ing Diagrams. The operation of the electrically
heated rear window defogger system can be con-
OUTSIDE MIRROR HEATING GRID firmed in one of the following manners:
Vehicles equipped with the optional heated mirror 1. Turn the ignition switch to the On position.
system have an electric heating grid located behind While monitoring the instrument panel voltmeter, set
the mirror glass of each outside rear view mirror. the defogger switch in the On position. When the
The heated mirrors are controlled by the rear win- defogger switch is turned On, a distinct voltmeter
dow defogger switch. Electrical current is directed to needle deflection should be noted.
the heating grid inside the mirror only when the rear 2. Turn the ignition switch to the On position. Set
window defogger switch is in the On position. the defogger switch in the On position. The rear win-
If the outside mirror heating grids are both inoper- dow defogger operation can be checked by feeling the
ative, see Rear Window Defogger System in the Diag- rear window or outside rear view mirror glass. A dis-
nosis and Testing section of this group. If only one of tinct difference in temperature between the grid lines
AN ELECTRICALLY HEATED SYSTEMS 8N - 3
DIAGNOSIS AND TESTING (Continued)
and the adjacent clear glass or the mirror glass can short circuit between the rear window defogger
be detected within three to four minutes of operation. switch defogger relay output and the rear glass heat-
3. Using a 12-volt DC voltmeter, contact the rear ing grid.
glass heating grid terminal A (right side) with the
negative lead, and terminal B (left side) with the pos- REAR GLASS HEATING GRID
itive lead (Fig. 1). The voltmeter should read battery For circuit descriptions and diagrams, refer to
voltage. 8W-48 - Rear Window Defogger in Group 8W - Wir-
ing Diagrams. To detect breaks in the grid lines, the
following procedure is required:
(1) Turn the ignition switch to the On position. Set
the defogger switch in the On position. The indicator
lamp should light. If OK, go to Step 2. If not OK, see
Defogger Switch in the Diagnosis and Testing section
of this group.
(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
Fig. 1 Rear Window Glass Grid Test - Typical a good body ground point. The voltage reading should
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