Instrument Panel; Vehicle Information Center - Jeep 1997 Grand Cherokee Service Manual

8E - 4 INSTRUMENT PANEL SYSTEMS
GENERAL INFORMATION (Continued)
within the instrument cluster are served by the clus-
ter circuit board and wire harness connectors. Those
lamps located in the GDM or VIC modules are served
by the GDM or VIC circuit board and wire harness
connectors.
Most of the indicator lamps in the instrument clus-
ter and VIC module are controlled by the instrument
cluster or VIC module electronic circuitry in response
to messages received over the Chrysler Collision
Detection (CCD) data bus network from the Body
Control Module (BCM), Powertrain Control Module
(PCM), and Airbag Control Module (ACM). Only the
anti-lock brake system lamp, four-wheel drive indica-
tor lamps, lamp outage warning lamp, low coolant
level warning lamp, low washer fluid warning lamp,
master lighting indicator lamp, and turn signal indi-
cator lamps are hard-wired.
BODY CONTROL MODULE
A Body Control Module (BCM) is used on this
model to control and integrate many of the electronic
functions and features included on the vehicle. The
BCM contains a central processing unit and inter-
faces 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 BCM
supports or controls, include:
• Chimes
• Automatic headlamp control
• Headlamp delay
• Headlamps on with ignition off and driver door
open warning
• Key in ignition with ignition off and driver door
open warning
• Automatic funeral or parade mode
• Panel lamp dimming
• Vehicle Theft Security System (VTSS)
• Vehicle immobilizer system
• Illuminated entry
• Heated rear window and heated outside mirror
control
• Intermittent wipe control
• Monitoring and transmitting door, hood, liftgate,
liftglass ajar data
• Monitoring and transmitting outside ambient
temperature data
• Monitoring and transmitting air conditioning
select switch data
• Courtesy lamp time-out
• Gulf coast country over-speed warning
• Door lock inhibit
• Electronic odometer and trip odometer
• Brake warning lamp
• Check gauges lamp
• High beam indicator lamp
• Seatbelt reminder lamp and chime
• Speed sensitive intermittent wipe
• Fog lamp control
• Electromechanical instrument cluster
• BCM diagnostic support
• Vehicle Information Center (VIC) support
• Rolling door locks
• Horn chirp upon door lock with Remote Keyless
Entry (RKE)(programmable)
• Low fuel warning chime (programmable)
• Headlights on with wipers (programmable - with
automatic headlamps only)
The BCM is mounted under the driver side out-
board end of the instrument panel, behind the instru-
ment panel support
outboard switch pod. For diagnosis of the BCM or the
CCD data bus, refer to the proper Body Diagnostic
Procedures manual. The BCM can only be serviced
by an authorized electronic repair station. Refer to
the latest Warranty Policies and Procedures manual
for a current listing of authorized electronic repair
stations.
JUNCTION BLOCK
The junction block is mounted on the right cowl
side kick panel below the right end of the instrument
panel. It is concealed behind the right cowl side trim.
The junction block serves to simplify and centralize
numerous electrical components.
The junction block has cavities for up to twenty-
two blade-type fuses, three circuit breakers, six ISO
micro-relays, and an electronic combination flasher
unit. It also eliminates the need for numerous splice
connections and serves in the place of a bulkhead
connector between the engine compartment, instru-
ment panel, and body wire harnesses.
The right cowl side trim panel has a snap-fit access
cover that can be removed for service of the junction
block fuses, but the cowl side trim panel must be
removed for service of other junction block compo-
nents. The junction block cannot be repaired and, if
faulty or damaged, it must be replaced.
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