For 1990-2009 cars

The audible warnings alert the driver of a system concern or a critical vehicle condition. The radio generates the audible warnings. The BCM receives audible warning requests via the serial data circuit. If the BCM receives multiple audible warning requests, the warning with the highest priority sounds first. 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

### Fasten Safety Belt Warning

The body control module (BCM) activates the fasten safety belt audible warning as requested by the sensing and diagnostic module (SDM). The SDM sends a serial data message to the BCM. 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 SDM detects that the driver seat belt is not buckled and or the signal is low. The BCM receives a serial data message from the SDM indicating the driver seat belt status.

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

### Key in Ignition Warning

The BCM monitors the signal circuit of the ignition switch. The BCM activates the key-in-ignition audible warning. The key-in-ignition warning sounds when the following occurs:

• | The ignition switch is OFF.

• | The BCM determines that the driver door is open and the signal circuit is low.

• | The BCM determines that the key-in-ignition switch is closed and the signal circuit is low.

### Lights On Warning

The BCM activates the lights on warning. The lights on warning sounds when the following occurs:

• | The ignition is OFF.

• | The BCM determines that the driver 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 BCM activates the park brake audible warning. The park brake warning sounds and the BRAKE indicator illuminates when the following occurs:

• | The ignition is ON.

• | The vehicle speed is greater than 5 km/h (3.1 mph). The BCM receives a serial data message from the ECM indicating the vehicle speed.

• | The BCM determines that the park brake is engaged and the signal circuit is low.

### Additional Warnings

The following warnings have an associated instrument panel cluster (IPC) indicator:

• | Hot coolant temperature--The audio amplifier activates the audible warning as requested by the body control module (BCM) or the ECM. The BCM sends a serial data message to the audio amplifier indicating the chime frequency and duration.

• | Low fuel--The audio amplifier activates the audible warning as requested by the BCM. The BCM sends a serial data message to the audio amplifier indicating the chime frequency and duration.

• | Low engine oil pressure--The audio amplifier activates the audible warning as requested by the BCM. The BCM sends a serial data message to the audio amplifier indicating the chime frequency and duration. The low engine oil pressure indicator will be ON in the IPC.

Refer to Indicator/Warning Message Description and Operation.