Jeep Cherokee 2000 Service Manual - page 498
ELECTRICALLY HEATED SYSTEMS
TABLE OF CONTENTS
page
page
REAR WINDOW DEFOGGER SYSTEM . . . . . . . . . . 1
HEATED SEAT SYSTEM . . . . . . . . . . . . . . . . . . . . . 8
REAR WINDOW DEFOGGER SYSTEM
TABLE OF CONTENTS
page
page
GENERAL INFORMATION
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . 1
REAR WINDOW DEFOGGER SYSTEM . . . . . . . . . 1
DESCRIPTION AND OPERATION
REAR GLASS HEATING GRID . . . . . . . . . . . . . . . . 2
OUTSIDE MIRROR HEATING GRID . . . . . . . . . . . . 2
DEFOGGER SWITCH . . . . . . . . . . . . . . . . . . . . . . 2
INSTRUMENT CLUSTER . . . . . . . . . . . . . . . . . . . . 2
DEFOGGER RELAY . . . . . . . . . . . . . . . . . . . . . . . . 3
DIAGNOSIS AND TESTING
DEFOGGER SYSTEM . . . . . . . . . . . . . . . . . . . . . . 3
REAR GLASS HEATING GRID . . . . . . . . . . . . . . . . 4
DEFOGGER SWITCH . . . . . . . . . . . . . . . . . . . . . . 4
DEFOGGER RELAY . . . . . . . . . . . . . . . . . . . . . . . . 4
INSTRUMENT CLUSTER . . . . . . . . . . . . . . . . . . . . 5
SERVICE PROCEDURES
REAR GLASS HEATING GRID REPAIR . . . . . . . . . 6
REMOVAL AND INSTALLATION
DEFOGGER SWITCH . . . . . . . . . . . . . . . . . . . . . . 6
DEFOGGER RELAY . . . . . . . . . . . . . . . . . . . . . . . . 7
GENERAL INFORMATION
INTRODUCTION
An electrically heated rear window defogger and
electrically heated outside rear view mirrors are
available factory-installed options on this model.
Refer to 8W-48 - Rear Window Defogger and 8W-62 -
Power Mirrors in Group 8W - Wiring Diagrams for
complete circuit descriptions and diagrams.
NOTE: This group covers both Left-Hand Drive
(LHD) and Right-Hand Drive (RHD) versions of this
model. Whenever required and feasible, the RHD
versions of affected vehicle components have been
constructed as mirror-image of the LHD versions.
While most of the illustrations used in this group
represent only the LHD version, the diagnostic and
service
procedures
outlined
can
generally
be
applied to either version. Exceptions to this rule
have been clearly identified as LHD or RHD, if a
special illustration or procedure is required.
REAR WINDOW DEFOGGER SYSTEM
The rear window defogger system will only operate
when the ignition switch is in the On position. When
the defogger switch is in the On position, an electric
heater grid on the rear window glass is energized.
Vehicles with the heated mirror options also have
heater grids located behind the outside rear view
mirror glass. Each of these grids produce heat to help
clear the rear window glass and outside rear view
mirrors of ice, snow, or fog.
The defogger system is controlled by a switch
installed in the instrument panel accessory switch
bezel, which is located near the bottom of the instru-
ment panel center bezel area, below the heater and
air conditioner controls. An amber indicator lamp in
the switch button will light to indicate when the
defogger system is turned on. The instrument cluster
circuitry, which contains the defogger system timer
logic, monitors the state of the defogger switch
through a hard-wired input. The instrument cluster
circuitry controls the defogger system through a
hard-wired control output to the defogger relay.
The defogger system will be automatically turned
off after a programmed time interval of about ten
minutes. After the initial time interval has expired, if
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ELECTRICALLY HEATED SYSTEMS
8N - 1