Body Control Module; Graphic Display Module; Indicator Lamp - Jeep 1997 Grand Cherokee Service Manual

ZG
GENERAL INFORMATION (Continued)
• Check gauges lamp
• Cruise-on indicator lamp
• Headlamp high beam indicator lamp
• Low fuel warning lamp
• Malfunction indicator (Check Engine) lamp
• Master lighting indicator lamp
• Seat belt reminder lamp
• Turn signal indicator lamps
• Upshift indicator lamp (manual transmission)
• Wait-to-start lamp (diesel engine)
• Water-in-fuel lamp (diesel engine).

GRAPHIC DISPLAY MODULE

A Graphic Display Module (GDM) is standard
equipment on all Grand Cherokee models, unless the
vehicle is equipped with the optional Vehicle Infor-
mation Center (VIC). The GDM is mounted in the
lower center stack area of the instrument panel,
above the ash receiver and below the heater-A/C con-
trols.
The display consists of a back-lit screen with a
vehicle outline. The two rear wheels of the vehicle
are illuminated by a lamp when the transfer case is
engaged in any two-wheel drive operating mode. The
two front wheels are also illuminated when the
transfer case is engaged in any four-wheel drive oper-
ating mode.
The GDM also has up to three lamps, which indi-
cate whether the four-wheel drive mode selected is
Lo, Part-Time, or Full-Time. The number of opera-
tional indicator lamps may vary, depending upon the
optional four-wheel drive transfer case in the vehicle.
A switch on the transfer case is hard-wired to the
GDM to illuminate the proper wheels and indicator
lamps.
The GDM bulbs can be serviced. However, if any
other part of the GDM is damaged or faulty, the
entire GDM must be replaced.
VEHICLE INFORMATION CENTER
The Vehicle Information Center (VIC) is an avail-
able option on Grand Cherokee models. The VIC
module replaces the standard equipment Graphic
Display Module. The VIC is mounted in the lower
center stack area of the instrument panel, above the
ash receiver and below the heater-A/C controls.
The VIC consists of a multicolored vacuum fluores-
cent display screen with a vehicle outline. The VIC is
able to display four functions in a choice of five lan-
guages. The display functions include:
• Current time (12 or 24 hour clock), day, and date
• Monitor specific vehicle operating systems and
alert the driver of a malfunction in a monitored sys-
tem
• Provide service reminders or the distance to the
next service interval
INSTRUMENT PANEL SYSTEMS
• The current transfer case mode of operation
(four-wheel drive models).
The display language choices include:
• English
• French
• German
• Italian
• Spanish.
The VIC receives input from hard-wired sensors
and over the Chrysler Collision Detection (CCD) data
bus network. In response to these inputs the VIC
offers a combination of graphic and message displays,
and provides requests for audible chime alerts to the
Body Control Module (BCM) on the CCD data bus.
Refer to the owner's manual for more information
on the VIC controls, operation, and setting proce-
dures. For diagnosis of the VIC module or the CCD
data bus, refer to the proper Body Diagnostic Proce-
dures manual. The VIC module cannot be repaired. If
damaged or faulty, the entire module must be
replaced.
GAUGE
With the ignition switch in the On or Start posi-
tions, voltage is supplied to all gauges through the
instrument cluster electronic circuit board. With the
ignition switch in the Off position, voltage is not sup-
plied to the gauges. The gauges do not accurately
indicate any vehicle condition unless the ignition
switch is in the On or Start positions.
All gauges, except the odometer, are air core mag-
netic units. Two fixed electromagnetic coils are
located within the gauge. These coils are wrapped at
right angles to each other around a movable perma-
nent magnet. The movable magnet is suspended
within the coils on one end of a shaft. The gauge nee-
dle is attached to the other end of the shaft.
One of the coils has a fixed current flowing
through it to maintain a constant magnetic field
strength. Current flow through the second coil
changes, which causes changes in its magnetic field
strength. The current flowing through the second coil
is changed by the instrument cluster electronic cir-
cuitry in response to messages received on the
Chrysler Collision Detection (CCD) data bus network.
The gauge needle moves as the movable permanent
magnet aligns itself to the changing magnetic fields
created around it by the electromagnets. These
gauges also feature a small fixed permanent magnet
which will cause the gauge needles to return to zero
after the ignition switch is turned to the Off position.

INDICATOR LAMP

Indicator lamps are located in the instrument clus-
ter, and in the Graphic Display Module (GDM) or the
Vehicle Information Center (VIC). Those lamps
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