CHIME/BUZZER
TABLE OF CONTENTS
page
page
CHIME/BUZZER - SERVICE INFORMATION
DESCRIPTION
. . . . . . . . . . . . . . . . . . . . . . . . . . 1
OPERATION
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
DIAGNOSIS AND TESTING
CHIME WARNING SYSTEM
. . . . . . . . . . . . . . . 4
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.
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 Controller Area Network (CAN) data bus along with hard wired inputs to monitor many sensors
HB
CHIME/BUZZER
8B - 1