Dodge 2000 DURANGO Service Manual page 496

8V - 2 OVERHEAD CONSOLE SYSTEMS
DESCRIPTION AND OPERATION (Continued)
faced tape to the inside surface of the roof panel. A
single electrical connection joins the overhead console
wire harness to the roof wire harness.
Following are general descriptions of the major
components used in the overhead console. See the
owner's manual in the vehicle glove box for more
information on the use and operation of the various
overhead console features.
COMPASS MINI-TRIP COMPUTER
DESCRIPTION
The compass mini-trip computer is located in the
overhead console on models equipped with this
option. The compass mini-trip computer units include
the electronic control module, a Vacuum-Fluorescent
Display (VFD), a compass sensor unit and two push
button function switches.
The compass mini-trip computer module contains a
central processing unit and interfaces with other
electronic modules in the vehicle on the Chrysler Col-
lision Detection (CCD) data bus network. The CCD
data bus network allows the sharing of sensor infor-
mation. This helps to reduce wire harness complexity,
reduce internal controller hardware, and reduce com-
ponent sensor current loads. At the same time, this
system provides increased reliability, enhanced diag-
nostics, and allows the addition of many new feature
capabilities.
The compass mini-trip computer provides several
electronic functions and features. Some of the func-
tions and features that the compass mini-trip com-
puter module supports and/or controls, include the
following display options:
•
Compass and temperature - provides the
outside temperature and one of eight compass read-
ings to indicate the direction the vehicle is facing.
• Trip odometer (TRIP ODO) - shows the dis-
tance travelled since the last trip computer reset.
• Average fuel economy (AVG ECO) - shows
the average fuel economy since the last trip computer
reset.
•
Instant fuel economy (ECO) - shows the
present fuel economy based upon the current vehicle
distance and fuel used information.
•
Distance to empty (DTE) - shows the esti-
mated distance that can be travelled with the fuel
remaining in the fuel tank. This estimated distance
is computed using the average miles-per-gallon from
the last 30 gallons of fuel used.
•
Elapsed time (ET) - shows the accumulated
ignition-on time since the last trip computer reset.
• Blank screen - the compass mini-trip VFD is
turned off.
The ambient temperature sensor is hard wired to
the compass mini-trip computer module. Data input
for all other compass mini-trip computer functions,
including VFD dimming level, is received through
CCD data bus messages. The compass mini-trip com-
puter uses its internal programming and all of these
inputs to calculate and display the requested data. If
the data displayed is incorrect, perform the self-diag-
nostic tests as described in this group. If these tests
prove inconclusive, the use of a DRB scan tool and
the proper Diagnostic Procedures manual are recom-
mended for further testing of the compass mini-trip
computer module and the CCD data bus.
The compass mini-trip computer module cannot be
repaired, and is available for service only as a unit.
This unit includes the push button switches and the
plastic module and display lens. If any of these com-
ponents is faulty or damaged, the complete compass
mini-trip computer module must be replaced.
COMPASS
While in the compass/temperature mode, the com-
pass will display the direction in which the vehicle is
pointed using the eight major compass headings
(Examples: north is N, northeast is NE). The self-cal-
ibrating compass unit requires no adjusting in nor-
mal use. The only calibration that may prove
necessary is to drive the vehicle in three complete
circles, on level ground, in not less than forty-eight
seconds. This will reorient the compass unit to its
vehicle.
The compass unit also will compensate for magne-
tism the body of the vehicle may acquire during nor-
mal use. However, avoid placing anything magnetic
directly on the roof of the vehicle. Magnetic mounts
for an antenna, a repair order hat, or a funeral pro-
cession flag can exceed the compensating ability of
the compass unit if placed on the roof panel. Mag-
netic bit drivers used on the fasteners that hold the
overhead console assembly to the roof header can
also affect compass operation. If the vehicle roof
should become magnetized, the demagnetizing and
calibration procedures found in this group may be
required to restore proper compass operation.
THERMOMETER
The thermometer displays the outside ambient
temperature in whole degrees. The temperature dis-
play can be changed from Fahrenheit to Celsius
using the U.S./Metric push button. The displayed
temperature is not an instant reading of conditions,
but an average temperature. It may take the ther-
mometer display several minutes to respond to a
major temperature change, such as driving out of a
heated garage into winter temperatures.
When the ignition switch is turned to the Off posi-
tion, the last displayed temperature reading stays in
the thermometer unit memory. When the ignition
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