The compass unit also will compensate for magnetism the body of the vehicle may acquire during normal 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 procession flag can exceed the compensating ability of the compass unit if placed on
the roof panel. Magnetic 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.
DESCRIPTION - TEMPERATURE
The temperature displays the outside ambient temperature in whole degrees. The temperature display can be tog-
gled from Fahrenheit to Celsius by selecting the desired U.S./Metric option from the customer programmable fea-
tures, (Refer to 8 - ELECTRICAL/OVERHEAD CONSOLE - STANDARD PROCEDURE - ELECTRONIC VEHICLE
INFORMATION CENTER PROGRAMMING). The displayed temperature is not an instant reading of conditions, but
an average temperature. It may take the thermometer 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 position, the last displayed temperature reading stays in the EOM unit
memory. When the ignition switch is turned to the On position again, the EOM will display the memory temperature
for one minute; then update the display to the current average temperature reading within five minutes if tempera-
ture is less than memory.
The temperature function is supported by an ambient temperature sensor. The sensor is mounted outside the pas-
senger compartment near the front and center of the vehicle, and is hard wired to the Powertrain Control Module
(PCM). The PCM sends temperature status messages to the EOM over the PCI data bus network. The ambient
temperature sensor is available as a separate service item.
OPERATION
The EVIC has access to both non-switched and ignition switched sources of battery current so that some of its
features remain operational at any time, while others may only operate with the ignition switch in the On position.
When the ignition switch is turned to the On position, the EVIC module VFD will return to the last function being
displayed before the ignition was turned to the Off position.
The compass/temperature display is the normal EVIC display. With the ignition switch in the On position, momen-
tarily depressing and releasing the C/T (compass/temperature) push button switch will cause the EVIC to return to
the compass/temperature display mode from any other mode. While in the compass/temperature display mode,
momentarily depressing and releasing the Step push button will step through the available trip computer display
options.
The EVIC trip computer features several functions that can be reset. The functions that can be reset are: average
fuel economy, trip odometer and elapsed time. With the ignition switch in the On position and with one of the func-
tions of the trip computer that can be reset currently displayed, depressing the Reset push button twice within three
seconds will perform a global reset, and all of the trip computer information that can be reset will be reset. With the
ignition switch in the On position and the function that is to be reset currently displayed, momentarily depressing
and releasing the Reset push button once will perform a local reset, and only the value of the displayed function will
be reset to zero. A global or local reset will only occur if the function currently displayed is a function that can be
reset. The distance to service function can also be reset by pressing and holding the RESET button for 1 second.
Refer to ELECTRONIC VEHICLE INFORMATION CENTER PROGRAMMING in the Standard Procedures section
of this group for more information on setting the Service Interval.
For more information on the features, control functions and setting procedures for the EVIC module, see the owner’s
manual in the vehicle glove box.
DIAGNOSIS AND TESTING - ELECTRONIC VEHICLE INFORMATION CENTER
If the problem with the EVIC is an inaccurate or scrambled display, refer to Self-Diagnostic Test later in this sec-
tion. If the problem with the EVIC is incorrect Vacuum Fluorescent Display (VFD) dimming levels, use a DRB scan
tool and the proper Diagnostic Procedures manual to test for the correct dimming message inputs being received
from the Body Control Module (BCM) over the Programmable Communications Interface (PCI) data bus. If the prob-
lem is a no-display condition, use the following procedures. For complete circuit diagrams, refer to Overhead Con-
sole in Wiring Diagrams.
1. Press the C/T button.
8M - 34
OVERHEAD CONSOLE-SERVICE INFO
KJ