Dodge Ram Truck 1500-2500-3500. Manual

*VEHICLE SPEED WARNING CHIME PROBLEM

For the Chime system circuit diagram (Refer to 8 - ELECTRICAL/CHIME/BUZZER - SCHEMATICS AND DIA-
GRAMS)

For a complete wiring diagram Refer to Section 8W.

Possible Causes

INCORRECT COUNTRY CODE PROGRAMMED IN CLUSTER

CLUSTER

Diagnostic Test

WITH THE DRBIII CHECK THE COUNTRY CODE SETTING

NOTE: The high speed warning chime is for Gulf
Coast Countries only.
Turn the ignition on.

With the DRBIII

in Miscellaneous check the Cluster

country code setting.

Is the country code incorrect?

Yes

>> Program the correct country code.

Perform BODY VERIFICATION TEST -
VER 1 (Refer to BODY VERIFICATION
TEST - VER 1).

>> Replace and program the Cluster in accor-

dance with the Service Information.

Perform BODY VERIFICATION TEST -
VER 1 (Refer to BODY VERIFICATION
TEST - VER 1).

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CHIME/BUZZER - ELECTRICAL DIAGNOSTICS

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CHIME/BUZZER - SERVICE INFORMATION

TABLE OF CONTENTS

page

CHIME/BUZZER - SERVICE INFORMATION

DESCRIPTION

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OPERATION

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DIAGNOSIS AND TESTING

CHIME WARNING SYSTEM

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CHIME/BUZZER - SERVICE INFORMATION

DESCRIPTION

A chime warning system is standard factory-installed equipment. The chime warning system uses an electrome-
chanical transducer and an electromechanical relay that are soldered onto the electronic circuit board inside of the
ElectroMechanical Instrument Cluster (EMIC) (1) to provide audible indications of various vehicle conditions that
may require the attention of the vehicle operator or occupants. The EMIC also includes the hardware and software
necessary to serve as the electronic body control module and is sometimes referred to as the Cab Compartment
Node or CCN.

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CHIME/BUZZER - SERVICE INFORMATION

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The electromechanical transducer generates beep tones and chime tones, while the electromechanical relay gen-
erates click tones to emulate the sounds associated with conventional turn signal and hazard warning flasher oper-
ation. The microprocessor-based EMIC utilizes electronic chime request messages received from other modules in
the vehicle over the Programmable Communications Interface (PCI) data bus network along with hard wired inputs
to monitor many sensors and switches throughout the vehicle. In response to those inputs, the circuitry and pro-
gramming of the EMIC allow it to control the audible outputs that are produced through its on-board transducer and
relay.

The EMIC is capable of producing the following audible outputs:

•

Slow Rate Repetitive Click - Repeated “click” tones that are issued at a slow rate of about 50 clicks per
minute.

•

Fast Rate Repetitive Click - Repeated “click” tones that are issued at a fast rate of more than about 100
clicks per minute.

•

Fixed Duration Beep - A short, sharp, single tactile “beep” tone.

•

Single Chime Tone - A single “chime” tone.

•

Slow Rate Repetitive Chime - Repeated “chime” tones that are issued at a slow rate of about 50 chimes per
minute.

•

Fast Rate Repetitive Chime - Repeated “chime” tones that are issued at a fast rate of about 180 chimes per
minute.

Hard wired circuitry connects the EMIC and the various chime warning system switch and sensor inputs to their
modules and to each other through the electrical system of the vehicle. These hard wired circuits are integral to
several wire harnesses, which are routed throughout the vehicle and retained by many different methods. These
circuits may be connected to each other, to the vehicle electrical system and to the EMIC through the use of a
combination of soldered splices, splice block connectors, and many different types of wire harness terminal con-
nectors and insulators. Refer to the appropriate wiring 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 warning system circuits and components cannot be adjusted or repaired. If the EMIC circuitry, the
on-board transducer or the relay are damaged or faulty, the EMIC unit must be replaced.

OPERATION

The chime warning system operates on battery voltage received through the Ignition-Off Draw (IOD) fuse in the
Power Distribution Center (PDC) on a non-switched fused B(+) circuit so that the system may operate regardless of
the ignition switch position. The chime warning system also monitors the ignition switch position so that some chime
features are functional only with the ignition switch in the On position, while others are functional regardless of the
ignition switch position.

The chime warning system provides an audible indication to the vehicle operator or occupants under the following
conditions:

•

Airbag Indicator Warning - The ElectroMechanical Instrument Cluster (EMIC) transducer will generate one
short chime when the ignition switch is in the On position, and an electronic message is received over the
Programmable Communications Interface (PCI) data bus from the Airbag Control Module (ACM) requesting
“Airbag” indicator illumination. This warning will only occur following completion of the “Airbag” indicator bulb
test, and will only occur once during any ignition cycle.

•

Compass Mini-Trip Computer Global Reset - The EMIC transducer will generate one short chime when the
ignition switch is in the On position, and an electronic message is received over the PCI data bus from the
optional Compass Mini-Trip Computer (CMTC) requesting that the CMTC average fuel economy, trip odometer
and distance to empty data be reset. The CMTC monitors hard wired inputs from the U.S./Metric and Reset
button switches to determine the proper reset messages to send to the EMIC.

•

Door Ajar Indicator Warning - The EMIC transducer will generate one short chime when the ignition switch
is in the On position, a hard wired input is received indicating that the status of any door ajar switch has
changed, and an electronic message is received over the PCI data bus indicating that the vehicle is moving.

•

Engine Coolant Temperature High Warning (Diesel Engine Only) - The EMIC transducer will generate a
single chime tone when the “Check Gauges” indicator is illuminated for a high or critical engine coolant tem-
perature condition. The instrument cluster uses engine coolant temperature message inputs received from the
diesel Engine Control Module (ECM) over the PCI data bus to illuminate the “Check Gauges” indicator for a
coolant temperature high condition.

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CHIME/BUZZER - SERVICE INFORMATION

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Dodge Ram Truck 1500-2500-3500. Manual - part 280