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Audible Warning Device: Description and Operation

Fig.1 Chime Warning System:




CHIME WARNING SYSTEM
The chime warning system uses a single chime tone generator that is integral to the Body Control Module (BCM) to provide an audible indication of vehicle conditions that may require the attention of the vehicle operator (Fig. 1). The chime warning system includes the following major components:
- Body Control Module
- Door Ajar Switch
- Headlamp Switch
- Ignition Switch
- Seat Belt Switch

Hard wired circuitry connects many of the chime warning system components to each other through the electrical system of the vehicle.

If the BCM or the chime tone generator are damaged or faulty the BCM unit must be replaced.

The chime warning system components operate on battery voltage received through the Ignition-Off Draw (IOD) fuse in the Power Distribution Center (PDC) on a non-switched B(+) circuit so that the system may operate regardless of the ignition switch position.

The chime warning system provides an audible indication to the vehicle operator under the following conditions:
- Fasten Seat Belt Warning - The Body Control Module (BCM) chime tone generator will generate repetitive chimes to announce that an input from the seat belt switch indicates the driver side front seat belt is not fastened. Unless the driver side front seat belt is fastened, the chimes will continue to sound for a duration of about 6 seconds each time the ignition switch is turned to the ON position or until the driver side front seat belt is fastened.
- Read/Park Lights-ON Warning - The BCM chime tone generator will generate repetitive chimes at a fast rate to announce that a Programmable Communications Interface (PCI) data bus driver door ajar message, along with hard wired inputs from the headlamp switch indicate that the exterior lamps are turned ON with the driver side front door opened. The chime will continue to sound until the exterior lamps are turned OFF, the driver side front door is closed, or the ignition switch is turned to the ON position.
- Key-In-Ignition Warning - The BCM chime tone generator will generate repetitive chimes at a fast rate to announce that a PCI data bus driver door ajar message received from the Driver Door Module (DDM), along with hard wired inputs from the key-in-ignition warning switch indicate that the key is in the ignition cylinder with the driver side front door opened and the ignition switch in the OFF position. The chime 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.
- Overspeed Warning - The BCM chime tone generator will generate repetitive chimes at a slow rate to announce that a PCI data bus vehicle speed message received from the Powertrain Control Module (PCM) indicates that the vehicle speed is above 120 km/h (75 mph). The chimes will continue to sound until the vehicle speed is below 120 km/h (75 mph). This feature is only enabled on a BCM that has been programmed with a Middle East Gulf Coast Country (GCC) country code.
- Tactile Beep Support - The BCM chime tone generator will generate a single beep each time a PCI data bus tactile beep request message is received from the Electronic Vehicle Information Center (EVIC) or the Sentry Key Immobilizer Module (SKIM). This beep provides an audible confirmation that an EVIC button was completely depressed, or that the optional Sentry Key Immobilizer System (SKIS) is in the "Customer Learn" mode.
- Warning Beep Support - The BCM chime tone generator will generate a short series of beeps each time a PCI data bus warning beep request message is received from the EVIC or the Electro-Mechanical Instrument Cluster (EMIC). These beeps provide an audible alert to the vehicle operator, of certain visual warning indications displayed by the EVIC and/or the EMIC.

The BCM provides chime service for all available features in the chime warning system. The BCM relies upon message inputs received from other modules over the PCI data bus network to provide chime service for all of the remaining chime warning system features.

The internal programming of the BCM determines the priority of each chime tone request input that is received, as well as the rate and duration of each chime tone that is to be generated.

CHIME SYSTEM
The chime system responds to requests from five modules: the Body Control Module (BCM), Electronic Vehicle Information Center (EVIC), Mechanical Instrument Cluster (MIC), Sentry Key Immobilizer Module (SKIM) and the Powertrain Control Module (PCM). Each module monitors its related systems and, via the PCI bus, requests the BCM to sound its internal chime as needed.

The chime will sound for the following conditions:

MIC Requested Chime Messages
- Airbag
- Check Gauges: Charging Voltage Low
Coolant Temp High
Low Oil Pressure
Charging Voltage High
- Low Fuel
- ABS
- Low Battery Voltage
- Water in Fuel (Diesel)
- Low Coolant level (Diesel)

BCM Initiated Chime Messages
- Headlamp ON with ignition OFF and driver door open
- Key in ignition with ignition OFF and driver door open
- Seat Belt Warning
- Overspeed Warning (Gulf Coast Countries Only)

EVIC Chime Requested Messages
When the following messages are displayed the EVIC will send a chime request to the BCM. The BCM will respond with a series of chimes.
- Turn signal ON for more than 1.0 mile
- Service reminder
- Coolant level low
- Washer fluid low
- Tire Pressure Monitoring System alert messages (if equipped)
- Door or liftgate ajar (when critical speed is reached)**




**CRITICAL SPEED CHART

Sentry Key Immobilizer System
The Sentry Key Immobilizer System (SKIS) also uses tactile beep support from the chime warning system. The Sentry Key Immobilizer Module (SKIM) is programmed to send chime request messages over the Programmable Communications Interface (PCI) data bus to the Body Control Module (BCM) to provide audible confirmation that:
- the SKIM has been successfully placed in the Customer Learn mode.
- A new Sentry key transponder has been successfully programmed by the SKIM.

See the owner's manual in the vehicle glove box for more information on the features, use and operation of the SKIS. Refer to Sentry Key Immobilizer System in the Description and Operation of the service information - Vehicle Theft/Alarm systems for more information on the SKIS. For diagnostic information, refer to the Powertrain Diagnostic Information.
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