Overhead Console Systems - Jeep 1997 Grand Cherokee Service Manual

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GENERAL INFORMATION
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . 1
DESCRIPTION AND OPERATION
COMPASS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
GARAGE DOOR OPENER STORAGE BIN . . . . . 2
READING AND COURTESY LAMP . . . . . . . . . . . 2
SUNGLASSES STORAGE BIN . . . . . . . . . . . . . . 3
THERMOMETER . . . . . . . . . . . . . . . . . . . . . . . . 2
TRIP COMPUTER . . . . . . . . . . . . . . . . . . . . . . . 1
DIAGNOSIS AND TESTING
THERMOMETER . . . . . . . . . . . . . . . . . . . . . . . . 3
TRIP COMPUTER, COMPASS, AND
GENERAL INFORMATION
INTRODUCTION
Two overhead consoles featuring a mini trip com-
puter, an electronic compass, and an outside ambient
temperature thermometer are available factory-in-
stalled options on this model. A long version of the
overhead console is used on models without a power
sunroof option. A short version of the overhead con-
sole is used on models with a power sunroof option.
The long overhead console also includes two front-
mounted and two rear-mounted reading and courtesy
lamps, a garage door opener storage bin, and a sun-
glasses storage bin. The short overhead console also
includes two reading and courtesy lamps and houses
the power sunroof switch.
Following are general descriptions of the major
components used in the overhead console. Refer to
8W-49 - Overhead Console in Group 8W - Wiring
Diagrams for complete circuit descriptions and dia-
grams.
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.

OVERHEAD CONSOLE SYSTEMS

OVERHEAD CONSOLE SYSTEMS
CONTENTS
page
THERMOMETER DISPLAY MODULE
SERVICE PROCEDURES
COMPASS CALIBRATION
COMPASS DEMAGNETIZING
COMPASS VARIATION ADJUSTMENT . . . . . . . . 4
REMOVAL AND INSTALLATION
AMBIENT TEMPERATURE SENSOR . . . . . . . . . 8
OVERHEAD CONSOLE . . . . . . . . . . . . . . . . . . . 6
PUSH BUTTON MODULE
READING AND COURTESY LAMP BULB . . . . . . 7
TRIP COMPUTER, COMPASS, AND
THERMOMETER DISPLAY MODULE
DESCRIPTION AND OPERATION
TRIP COMPUTER
A mini trip computer is available on this model to
provide several electronic functions and features. The
trip computer contains a central processing unit and
interfaces with other modules in the vehicle on the
Chrysler Collision Detection (CCD) data bus network.
The CCD data bus network allows the sharing of
sensor information. This helps to reduce wire har-
ness complexity, reduce internal controller hardware,
and reduce component sensor current loads. At the
same time, this system provides increased reliability,
enhanced diagnostics, and allows the addition of
many new feature capabilities.
Some of the functions and features that the trip
computer supports and/or controls, include the fol-
lowing display options:
• Compass and temperature
• Trip odometer (ODO)
• Average fuel economy (AVG ECO)
• Instant fuel economy (ECO)
• Distance to empty (DTE)
• Elapsed time (ET)
• Blank display.
Momentarily depressing and releasing the Step
button when the ignition switch is in the On position
will cause the overhead console display to step
sequentially through the listed display options.
Momentarily depressing and releasing the U.S./Met-
ric button toggles the display between U.S. and Met-
ric measurements. For more information on the trip
computer features and functions, refer to the owner's
manual in the vehicle glove box.
8V - 1
page
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