GM Service Manual Online
For 1990-2009 cars only

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. 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 radio activates the fasten safety belt audible warning as requested by the IPC. The IPC sends a class 2 message to the radio indicating the chime frequency and duration 8 seconds. The fasten safety belt warning sounds and the fasten safety belt indicator illuminates when the following occur:

    • The ignition switch transitions to ON.
    • The SDM detects that the driver's seat belt is not buckled signal circuit is low. The IPC receives a class 2 message from the SDM requesting illumination of the seat belt indicator.

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 radio activates the key in ignition audible warning as requested by the dash integration module (DIM). The DIM sends a class 2 message to the radio 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 driver door module (DDM) determines that the driver's door is open signal circuit is low. The DIM receives a class 2 message from the DDM indicating that the door ajar switch is active.
    • The instrument panel integration module (IPM) (with CJ2) or the HVAC control module (with C67) determines that the ignition key alarm switch is closed signal circuit is low. The DIM receives a class 2 message from the DDM indicating that the key is in the ignition.

Lights On Warning

The radio activates the lights on warning as requested by the dash integration module (DIM). The DIM sends a class 2 message to the radio indicating the chime frequency and duration (continuous). The lights on warning sounds when the following occur:

    • The ignition is OFF.
    • The driver door module (DDM) determines that the driver door is open or ajar signal circuit is low. The DIM receives a class 2 message from the DDM indicating that the door ajar switch is active.
    • The DIM determines that the headlamp switch is in the park or head position.

Park Brake Warning

The radio activates the park brake audible warning as requested by the IPC. The IPC sends a class 2 message to the radio indicating the chime frequency and duration continuous. The park brake warning sounds and the brake indicator illuminates when the following actions occur:

    • The ignition is ON.
    • The vehicle moves a minimum of 3 meters 10 feet to a maximum of 15.2 meters 50 feet. The IPC calculates the distance based on a class 2 message from the PCM indicating the vehicle speed.
    • The IPC determines that the park brake is engaged signal circuit is low.

Turn Signal On

The radio activates the turn signal on audible warning as requested by the IPC. The IPC sends a class 2 message to the radio indicating the chime frequency and duration continuous. The turn signal on warning sounds when the following occurs:

    • The ignition is ON.
    • The IPC detects that the turn signal is active for greater than 1.28 km 0.8 miles. The IPC calculates the distance based on a class 2 message from the PCM indicating the vehicle speed.

Additional Warnings

The following indicators have an associated warning:

Instrument Panel Cluster (IPC)

    • Air bag
    • ABS
    • BRAKE brake system failure detected by the EBCM.
    • BRAKE low brake fluid level.
    • Low fuel
    • Low oil pressure
    • SECURITY
    • SERVICE VEHICLE SOON
    • TRACTION OFF

Driver Information Center (DIC)

    • BATTERY SAVER ACTIVE
    • CHECK CHARGE SYSTEM
    • GAS CAP LOOSE -- CHECK CAP
    • CHECK TIRE PRESSURE
    • DOOR AJAR
    • CHANGE ENGINE OIL SOON
    • ENGINE OIL LEVEL LOW -- CHECK LEVEL
    • SERVICE STABILITY SYSTEM
    • THEFT ATTEMPT DETECTED
    • TRUNK AJAR
    • TURN SIGNAL STILL ON?
    • WINDSHIELD WASHER FLUID LOW

Refer to Indicator/Warning Message Description and Operation for more information on the indicators and warning messages.