Grand Cherokee 2WD V8-4.7L VIN J (2004)
described. If these tests prove inconclusive, the use of a DRBIII(R) scan tool and the proper Diagnostic Procedures manual are recommended for further
testing of the EVIC module and the PCI data bus.
The EVIC module cannot be repaired, and is available for service only as a unit. This unit includes the push button switches and the plastic housed
module. If any of these components are faulty or damaged, the complete EVIC module must be replaced. The incandescent bulbs used for EVIC push
button backlighting and the display lens are available for service replacement.
ELECTRONIC VEHICLE INFORMATION CENTER CHIME
The Electronic Vehicle Information Center (EVIC) uses the chime warning system for two different kinds of support. In addition to requesting chime
tones from the Body Control Module (BCM) as tactile beep support, the EVIC is programmed to send chime request messages over the Programmable
Communications Interface (PCI) data bus when it detects the following conditions:
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Door Open Warning - A door is open above a critical speed [about 16 kilometers-per-hour (10 miles-per-hour) for the driver side front door, or
about 5 kilometers-per-hour (3 miles-per-hour) for any other door].
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Liftgate Open Warning - The liftgate is open above a critical speed [about 5 kilometers-per-hour (3 miles-per-hour)].
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Liftglass Open Warning - The liftgate flip-up glass is open above a critical speed [about 5 kilometers-per-hour (3 miles-per-hour)].
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Low Coolant Level Warning - The coolant level in the engine coolant reservoir is low.
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Perform Service Alert - An audible alert that a "Perform Service" reminder message is being displayed by the EVIC.
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Turn Signal On Warning - A turn signal remains on for about 1.6 kilometers (one mile).
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Washer Fluid Low Warning - The fluid level in the washer reservoir is low.
See the owner's manual in the vehicle glove box for more information on the features, use and operation of the EVIC.
COMPASS
While in the compass/temperature mode, the compass 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-calibrating compass unit requires no adjusting in normal use. The only calibration that may prove
necessary is to drive the vehicle in one circle at 5 to 8 kilometers-per-hour (3 to 5 miles-per-hour), on level ground, in not less than 20 seconds. This
will reorient the compass unit to its vehicle.
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 may be required to
restore proper compass operation.
TEMPERATURE
The outside ambient temperature is displayed in whole degrees. The temperature display can be toggled from Fahrenheit to Celsius by selecting the
desired U.S./Metric option from the customer programmable features as described in ELECTRONIC VEHICLE INFORMATION CENTER
PROGRAMMING in the Standard Procedures section. The displayed temperature is not an instant reading of conditions, but an average temperature. It
may take the temperature 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 Body Control Module (BCM) unit memory.
When the ignition switch is turned to the On position again, the EVIC will display the memory temperature for one minute; then update the display to
the current average temperature reading within five minutes.
The temperature function is supported by an ambient temperature sensor. The sensor is mounted outside the passenger compartment near the front and
center of the vehicle, and is hard wired to the Body Control Module (BCM). The BCM sends temperature status messages to the EVIC module over the
PCI data bus network. The ambient temperature sensor is available as a separate service item.
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, momentarily depressing and releasing the C/T
(compass/temperature) push button switch will cause the EVIC to return to the compass/temperature/trip computer display mode from any other mode.
While in the compass/temperature/trip computer 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 functions 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 to zero. With the ignition switch in the On position and the function that is to be reset currently displayed, depressing and releasing the Reset push
