Chime Warning System

The chime warning system operates on battery voltage received through a 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 Instrument Panel Cluster (IPC) transducer will generate one short chime when the ignition switch is in the ON  position, and the airbag indicator is illuminated. This warning indicates that a failure condition has been monitored affecting the operation of the Supplemental Restraint System (SRS) related components or circuits. This warning will only occur following completion of the airbag indicator bulb test, and will only occur once during any ignition cycle.
• Door Ajar Warning  - The IPC will generate one short chime when the ignition switch is in the ON  position, when the door ajar indicator is illuminated. This warning indicates that a door is, or multiple doors are not closed or completely latched while the vehicle is moving.
• Fasten Seat Belt Indicator Warning  - The IPC transducer will generate repetitive chimes for about six seconds to announce that the seat belt switches and the ignition switch indicate that a front seat belt is not fastened with the ignition switch in the ON  position. Above a pre-programmed speed threshold, the repetitive chimes will occur for a 96 second duration or until both front seat belts are fastened, whichever occurs first.
• Key-In-Ignition Warning  - The IPC transducer will generate repetitive chimes at a fast rate to indicate that inputs from the key-in ignition switch, the ignition switch, and the driver side front door ajar switch indicate that the key is in the ignition lock cylinder with the ignition switch in the OFF  position with the driver side front door open. The chimes will continue to sound until the key is removed from the ignition lock cylinder, the driver side front door is closed, or the ignition switch is turned to the ON  position, whichever occurs first.
• Park Brake Reminder  - The IPC transducer will generate one short chime when the brake/park brake indicator is illuminated to announce that the park brake is applied or not fully released and the vehicle is moving. This chime will repeat each time the input conditions are met.
• Warning Indicator Announcement  - The IPC transducer will generate one short chime each time certain other indicators are illuminated by the instrument cluster circuitry. These indicators may be illuminated when any critical systems are operating outside of their normal parameters. The IPC monitors electronic messages received over the Controller Area Network (CAN) data bus to determine when to illuminate these indicators.

The IC provides chime service for all available features in the chime warning system. The IPC relies upon its internal programming, numerous hardwired inputs, and electronic message inputs received from other modules over the CAN data bus to provide the chime warning system features. The internal programming of the IPC determines the priority of each chime request input that is received, as well as the rate and duration of each chime that is to be generated.