Chime Warning System

CHIME WARNING SYSTEM

The chime warning system operates on battery voltage received through a fuse in the fuse and relay block (also known as the SRB) 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 electronic messages received over the Controller Area Network (CAN) data bus from the Electronic Ignition Switch/Central GateWay (EIS or EIS/CGW) (also known as the EZS control unit) to determine the ignition switch position so that some chime features are functional only with 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:

- Fasten Seat Belt Indicator Warning - Each time the ignition switch is turned to the ON position and the seatbelt indicator is illuminated, the ElectroMechanical Instrument Cluster (EMIC) (also known as the Cab Compartment Node/CCN or KOMBI) electromechanical transducer will generate intermittent gong tones in intervals of 5 seconds on and 3 seconds off for a duration of about 95 seconds, or until the seatbelt indicator is extinguished, whichever occurs first. The EMIC uses internal programming as well as electronic ignition switch status messages received from the EIS and electronic driver side front seat belt status messages received over the CAN data bus from the Occupant Restraint Controller (ORC) (also known as the lowline or highline airbag control unit/ARCADE) to determine the proper operation of the visual seatbelt indicator and the audible seat belt indicator warning.
- Head/Park Lamps-On Warning - The EMIC electromechanical transducer will generate repetitive gong tones at a fast rate when a front door is opened with the ignition switch in any position except ON, and the exterior lights are turned ON. The EMIC uses internal programming as well as electronic ignition switch status messages received over the CAN data bus from the EIS, as well as door ajar switch status and exterior lighting status messages received from the Body Control Module (BCM) (also known as the Signal Acquisition and Actuation Module/SAM) to determine the proper operation of the audible lamps-ON warning. This warning will continue to sound until the exterior lighting is turned OFF, until the ignition switch is turned to the ON position, or until both front doors are closed, whichever occurs first.
- Overspeed Warning - The EMIC electromechanical transducer will generate repetitive gong tones at a fast rate when the vehicle speed exceeds a set speed value, such as on downhill grades. The EMIC uses internal programming and electronic vehicle speed messages received over the CAN data bus from the Controller Antilock Brake (CAB) (also known as the Antilock Brake System/ABS or Electronic Stability Program/ESP controller) and electronic set speed messages from the Steering Control Module (SCM) (also known as the MRM) to determine the proper limiter set speed and the proper operation of the audible overspeed warning.
- Park Brake Reminder - The EMIC electromechanical transducer will generate repetitive gong tones at a fast rate when the park brake indicator is illuminated with a vehicle speed of 5 kilometers-per-hour (5 miles-per-hour). The EMIC uses internal programming and electronic park brake switch status messages received over the CAN data bus from the BCM and electronic vehicle speed messages from the CAB to determine the proper operation of the audible park brake reminder warning. This warning will repeat each time the input conditions are met.
- Turn Signal/Hazard Warning Indicator Audible Support - The EMIC electromechanical relay will generate repetitive clicks in concert with the operation of the turn signal indicators in the cluster. The clicking sound occurs at a slow rate during normal turn signal/hazard warning operation, or at a fast rate when a turn signal lamp bulb or circuit is inoperative. These clicks are designed to emulate the sound of the opening and closing of the contact points in a conventional electromechanical turn signal or hazard warning flasher. The EMIC uses electronic turn signal switch status and hazard switch status message inputs received over the CAN data bus from the BCM to determine when to flash the turn signal indicators and activate the relay. The turn signal clicks will continue to sound until the turn signal switch is turned OFF, or until the ignition switch is turned to the OFF position, whichever occurs first. The hazard warning clicks will continue to sound until the hazard warning switch is turned OFF.
- Warning Indicator Announcement - The EMIC electromechanical buzzer will generate a warning tone each time various faults or critical operating conditions are detected by the EMIC circuitry. The EMIC uses internal programming and electronic messages received over the CAN data bus from many modules in the vehicle to determine when to operate this audible indicator warning announcement.
- Warning Textual Message Announcement - The EMIC electromechanical transducer will generate a warning chime each time various warning messages are shown within the EMIC multi-function indicator display. The EMIC uses internal programming and electronic messages received over the CAN data bus from many modules in the vehicle to determine when to operate this audible textual message warning announcement.

The EMIC provides chime service for all available features in the chime warning system, except for the audible warning function provided by the optional park assist system. The EMIC relies upon its internal programming and electronic message inputs received over the CAN data bus from other electronic modules to provide the chime warning system features. The internal programming of the EMIC determines the priority of each chime request input that is received, as well as the rate and duration of each tone that is to be generated.

The hard wired circuits between components related to the chime warning system may be diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information. The wiring information includes wiring diagrams, proper wire and connector repair procedures, details of wire harness routing and retention, connector pin-out information and location views for the various wire harness connectors, splices and grounds.

However, conventional diagnostic methods will not prove conclusive in the diagnosis of the chime warning system or the electronic controls or communication between modules and other devices that provide some features of the chime warning system. The most reliable, efficient, and accurate means to diagnose the chime warning system or the electronic controls and communication related to chime warning system operation requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic information.