Audible Warnings Description and Operation

Audible Warnings Description and Operation

The audible warnings alert the driver of a system concern or a critical vehicle condition. The radio generates the audible warnings through the left front speaker. The radio receives audible warning requests via the class 2 serial data line. If the radio receives multiple audible warning requests, the warning with the highest priority sounds first. On vehicles with RPO UQA the audio amplifier, instead of the radio, generates the audible warnings and receives audible warnings requests via the class 2 serial data line. Either the radio or the instrument panel cluster (IPC) is the chime producer. The following lists the audible warning priority and the pulse rate:

1. Fast rate chime (200 pulses per minute)
2. Medium rate chime (150 pulses per minute)
3. Slow rate chime (50 pulses per minute)
4. Single chime

Door Ajar Warning

The chime producer activates the door ajar audible warning as requested by the instrument panel cluster (IPC). The IPC sends a class 2 message to the chime producer indicating the chime frequency (medium rate) and duration (4 pulses). The door ajar warning sounds and the appropriate DOOR AJAR indicator illuminates in the driver information center (DIC) when the following occurs:

* The body control module (BCM) determines that a door, driver door, passenger door, left rear door, right rear door, is open and the signal circuit is low. The IPC receives a class 2 message from the BCM indicating the door ajar status.
* The vehicle is not in park. The IPC receives a class 2 message from the PCM indicating the gear position.
* The vehicle speed is greater than 8.05 km/h (5 MPH). The IPC uses the vehicle speed signal circuit (4000 pulses/mile) from the PCM in order to calculate the vehicle speed.

Fasten Safety Belt Warning

The chime producer activates the fasten safety belt audible warning as requested by the instrument panel cluster (IPC). The IPC sends a class 2 message to the chime producer indicating the chime frequency (slow rate) and duration (8 seconds). The fasten safety belt warning sounds and the fasten safety belt indicator illuminates when the following occurs:

* The ignition switch transitions to ON.
* The inflatable restraint sensing and diagnostic module (SDM) detects that the driver's seat belt is not buckled (signal is low). The IPC receives a class 2 message from the SDM indicating the drivers seat belt status.

If the seat belt is buckled when the ignition is turned ON, the chime will not sound. If the seat belt is buckled while the chime is sounding, the chime will stop. If the seat belt is unbuckled after the initial transition to ON, the chime will not sound.

Key-In-Ignition Warning

The chime producer activates the key-in-ignition audible warning as requested by the instrument panel cluster (IPC). The IPC sends a class 2 message to the chime producer indicating the chime frequency (medium rate) and duration (continuous). The key-in-ignition warning sounds when the following occurs:

* The ignition switch is OFF.
* The body control module (BCM) determines that the driver's door is open and the signal circuit is low. The IPC receives a class 2 message from the BCM indicating the door ajar status.
* The BCM determines that the key-in-ignition switch is closed and the signal circuit is low. The IPC receives a class 2 message from the BCM indicating the key-in-ignition status.

Lights On Warning

The chime producer activates the lights on warning as requested by the body control module (BCM). The BCM sends a class 2 message to the chime producer indicating the chime frequency (fast rate) and duration (continuous). The lights on warning sounds when the following occurs:

* The ignition is OFF.
* The BCM determines that the drivers door is open and the signal circuit is low.
* The BCM determines that the headlamp switch is in the park or head position.

Park Brake Warning

The chime producer activates the park brake active audible warning as requested by the instrument panel cluster (IPC). The IPC sends a class 2 message to the chime producer indicating the chime frequency (fast rate) and duration (4 pulses).

* The body control module (BCM) determines that the park brake is applied.
* The vehicle is not in park. The IPC receives a class 2 message from the powertrain control module (PCM) indicating the gear position.
* The vehicle speed is greater than 8.05 km/h (5 mph). The IPC uses the vehicle speed signal circuit (4000 pulses/mile) from the powertrain control module (PCM) in order to calculate the vehicle speed.

Additional Warnings

The following warnings have an associated instrument panel cluster (IPC) indicator or driver information center (DIC) indicator:

* Check Oil Level
The chime producer activates the audible warning as requested by the IPC. The IPC sends a class 2 message to the chime producer indicating the chime frequency (medium rate) and duration (4 pulses).
* Low Fuel
The chime producer activates the audible warning as requested by the IPC. The IPC sends a class 2 message to the chime producer indicating the chime frequency (medium rate) and duration (4 pulses).
* Oil Pressure Low Stop Engine
The chime producer activates the audible warning as requested by the IPC. The IPC sends a class 2 message to the chime producer indicating the chime frequency (fast rate) and duration (continuous).
* Reduced Engine Power
The chime producer activates the audible warning as requested by the IPC. The IPC sends a class 2 message to the chime producer indicating the chime frequency (medium rate) and (4 pulses) duration.
* Trans Hot Idle Engine
The chime producer activates the audible warning as requested by the IPC. The IPC sends a class 2 message to the chime producer indicating the chime frequency (fast rate) and duration (continuous).
* Turn Signal On
The chime producer activates the audible warning as requested by the IPC. The IPC sends a class 2 message to the chime producer indicating the chime frequency (fast rate) and duration (1 pulse).

Refer to Indicator/Warning Message Description and Operation.