Jeep 1997 Grand Cherokee Service Manual page 597

ZG
CHIME/BUZZER WARNING SYSTEMS
GENERAL INFORMATION
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . 1
DESCRIPTION AND OPERATION
BODY CONTROL MODULE . . . . . . . . . . . . . . . . 1
DRIVER DOOR AJAR SWITCH
DRIVER SEAT BELT SWITCH
HEADLAMP SWITCH . . . . . . . . . . . . . . . . . . . . . 2
KEY-IN IGNITION SWITCH . . . . . . . . . . . . . . . . . 2
GENERAL INFORMATION
INTRODUCTION
This group covers the chime warning system,
which is standard factory-installed equipment on this
model. The chime warning system provides an audi-
ble warning to the driver under the following condi-
tions:
• A door is ajar 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]
• Check engine lamp illumination
• Check gauges lamp illumination
• Driver side seat belt is not fastened (belt web-
bing is on the retractor spool) with the ignition
switch in the On position
• Head or park lamps are turned on with the igni-
tion switch Off and the driver side front door open
• High speed warning - Gulf Coast Countries
(export only)
• Key is in the ignition switch with the ignition
switch Off and the driver side front door open
• Low fuel warning lamp illumination - less than
about one-eighth tank of fuel remaining
• Rear lamp failure
• Transmission oil temperature is too high
• Turn signal remains on for about 1.6 kilometers
(one mile) with no decrease in speed or throttle open-
ing
• Washer level low lamp illumination.
Following are general descriptions of the major
components in the chime warning system. Refer to
8W-44 - Interior Lighting or 8W-45 - Body Control
Module in Group 8W - Wiring Diagrams for complete
circuit descriptions and diagrams.
NOTE: This group covers both Left-Hand Drive
(LHD) and Right-Hand Drive (RHD) versions of this
model. Whenever required and feasible, the RHD
CONTENTS
page
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CHIME/BUZZER WARNING SYSTEMS
DIAGNOSIS AND TESTING
DRIVER DOOR AJAR SWITCH
DRIVER SEAT BELT SWITCH
HEADLAMP SWITCH . . . . . . . . . . . . . . . . . . . . . 3
KEY-IN IGNITION SWITCH . . . . . . . . . . . . . . . . . 3
REMOVAL AND INSTALLATION
CHIME WARNING SYSTEM SWITCHES
versions of affected vehicle components have been
constructed as mirror-image of the LHD versions.
While most of the illustrations used in this group
represent only the LHD version, the diagnostic and
service procedures outlined can generally be
applied to either version. Exceptions to this rule
have been clearly identified as LHD or RHD, if a
special illustration or procedure is required.
DESCRIPTION AND OPERATION
BODY CONTROL MODULE
A Body Control Module (BCM) is used on this
model to control and integrate many of the electronic
functions and features on the vehicle. The BCM con-
tains a central processing unit and interfaces with
other modules in the vehicle on the Chrysler Colli-
sion 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.
One of the functions and features that the BCM
supports is the chime warning system. The BCM con-
tains a chime tone generator to perform the functions
of the chime warning module. The BCM uses hard-
wired inputs, internal programming, and CCD data
bus chime request message inputs to decide when a
chime tone is required.
The BCM is mounted under the driver side out-
board end of the instrument panel, behind the instru-
ment panel support
outboard switch pod. Refer to Group 8E - Instrument
Panel Systems for the removal and installation pro-
cedures.
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armature and below
8U - 1
page
the