CHIME / BUZZER
TABLE OF CONTENTS
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CHIME/BUZZER
DESCRIPTION
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OPERATION
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DIAGNOSIS AND TESTING - CHIME
WARNING SYSTEM
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CHIME / BUZZER
DESCRIPTION
A chime warning system is standard factory-in-
stalled equipment. The chime warning system uses a
chime tone generator and a contactless relay that are
soldered onto the electronic circuit board inside the
ElectroMechanical Instrument Cluster (EMIC) to
provide audible indications of various vehicle condi-
tions that may require the attention of the vehicle
operator
or
occupants.
The
microprocessor-based
EMIC utilizes electronic messages received from
other modules in the vehicle over the Controller Area
Network (CAN) data bus network along with hard
wired inputs to the cluster to monitor many sensors
and switches throughout the vehicle. In response to
those inputs, the circuitry and internal programming
of the EMIC allow it to control audible outputs that
are produced through its on-board chime tone gener-
ator and contactless relay.
The EMIC circuitry and its chime tone generator
are capable of producing the following audible out-
puts:
•
Single Chime Tone - A single, extended “beep-
like” chime tone is issued as a seat belt reminder.
•
Fast Rate Repetitive Chime Tone - Repeated
“beep-like” tones that are issued at a fast rate as an
audible alert and to support various visual warnings.
•
Slow Rate Repetitive Click Tone - Repeated
“click-like” tones that are issued at a slow rate to
emulate turn signal and hazard flasher operation.
•
Fast Rate Repetitive Click Tone - Repeated
“click-like” tones that are issued at a fast rate to
emulate turn signal flasher operation with a bulb
out.
Hard wired circuitry connects the EMIC and the
various chime warning switch and sensor inputs to
their respective modules and to each other through
the electrical system of the vehicle. These hard wired
circuits are integral to the vehicle wire harness,
which is routed throughout the vehicle and retained
by many different methods. These circuits may be
connected to each other, to the vehicle electrical sys-
tem and to the EMIC through the use of a combina-
tion of soldered splices, splice block connectors, and
many different types of wire harness terminal con-
nectors and insulators. Refer to the appropriate wir-
ing information. The wiring information includes
wiring diagrams, proper wire and connector repair
procedures, further details on wire harness routing
and retention, as well as pin-out and location views
for the various wire harness connectors, splices and
grounds.
The EMIC chime tone generator and contactless
relay cannot be adjusted or repaired. If the chime
tone generator or contactless relay are damaged or
faulty, the entire EMIC unit must be replaced.
OPERATION
The chime warning system components operate on
battery current received through a non-switched
fused B(+) circuit so that the system may operate
regardless of the ignition switch position. The Elec-
troMechanical Instrument Cluster (EMIC) also mon-
itors the ignition switch position so that some chime
features will only occur with ignition switch in the
On position, while others occur regardless of the igni-
tion switch position.
The chime warning system provides an audible
indication to the vehicle operator or occupants under
the following conditions:
•
Engine Oil Level Low Warning - Each time
the ignition switch is turned to the On position, the
EMIC chime tone generator will generate a fast rate
repetitive chime tone if electronic messages are
received over the Controller Area Network (CAN)
data bus from the Engine Control Module (ECM)
indicating that the engine level is too low. The ECM
uses internal programming and hard wired inputs
from the engine oil level and temperature sensor to
determine the engine oil level. This audible warning
occurs in concert with the visual warning provided by
the multi-function indicator in the cluster.
•
Fasten Seat Belt Reminder - Each time the
ignition switch is turned to the On position, the
EMIC chime tone generator will generate a single
extended chime tone for a duration of about six sec-
onds, or until the driver side front seat belt is fas-
tened,
whichever
occurs
first.
The
EMIC
uses
internal programming and a hard wired input from
the driver side front seat belt switch to determine
VA
CHIME/BUZZER
8B - 1
