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

Door Ajar Warning

The radio activates the door ajar audible warning as requested by the IPC. The IPC receives class 2 messages from the driver door module (DDM) indicating that the specific door ajar switch is active. The IPC sends a class 2 message to the radio indicating the chime frequency (medium rate) and duration (4 repetitions). The door ajar warning sounds and the door ajar indicator(s) illuminate when the following occurs:

    • The DDM determines that the driver's door is open or ajar (signal circuit is low).
    • The passenger door module (PDM) detects that the passenger's door is open or ajar (signal circuit is low). The PDM sends a message to the DDM via the simple bus interface (SBI) indicating that the door ajar switch is active.
    • The right rear door module (RRDM) detects that the right rear door is open or ajar (signal circuit is low). The RRDM sends a message to the DDM via the SBI indicating that the door ajar switch is active.
    • The left rear door module (LRDM) detects that the left rear door is open or ajar (signal circuit is low). The LRDM sends a message to the DDM via the SBI indicating that the door ajar switch is active.

Fasten Safety Belt Warning

The radio activates the fasten safety belt audible warning as requested by the inflatable restraint sensing and diagnostic module (SDM). The SDM sends a class 2 message to the radio 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 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 (fast rate) and duration (continuous). The lights on warning sounds when the following occurs:

    • The ignition is OFF.
    • The driver door module (DDM) determines that the driver's 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 (fast rate) and duration (continuous). The park brake warning sounds and the brake indicator illuminates when the following occurs:

    • 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 warnings have an associated indicator:

Instrument Panel Cluster (IPC)

    • Air bag (medium rate chime)
    • ANTILOCK (ABS) (medium rate chime)
    • Brake system (low brake fluid level) (medium rate chime)
    • SECURITY (medium rate chime)
    • SERVICE VEHICLE SOON (medium rate chime)

Driver Information Center (DIC)

    • ALARM OCCURRED (medium rate chime)
    • BATTERY SAVER ACTIVE (fast rate chime)
    • CALIBRATE COMPASS (medium rate chime)
    • CHECK CHARGE SYSTEM (fast rate chime)
    • CHECK GAGES LOW FUEL (fast rate chime)
    • CHECK GAGES OIL PRESSURE (fast rate chime)
    • CHECK GAGES TEMPERATURE (fast rate chime)
    • CHECK GAGES VOLT (fast rate chime)
    • CHECK GAS CAP (medium rate chime)
    • CHECK TIRE PRESSURE (medium rate chime)
    • DRIVER DOOR AJAR (medium rate chime)
    • ENGINE HOT A/C DISABLED (medium rate chime)
    • ENGINE OIL CHANGE NOW (medium rate chime)
    • ENGINE OIL CHANGE SOON (medium rate chime)
    • FRONT PASSENGER DOOR AJAR (medium rate chime)
    • LEFT REAR DOOR AJAR (medium rate chime)
    • OIL LEVEL LOW (medium rate chime)
    • RIGHT REAR DOOR AJAR (medium rate chime)
    • SERVICE STABILITY SYSTEM (medium rate chime)
    • SERVICE THEFT SYSTEM (medium rate chime)
    • SERVICE VEHICLE SOON (medium rate chime)
    • STARTING DISABLED-THEFT (medium rate chime)
    • TRUNK AJAR (medium rate chime)
    • TURN SIGNAL ON? (medium rate chime)
    • WASHER FLUID LOW (medium rate chime)

Systems Monitor

    • CHECK GAGES (fast rate chime)
    • CHECK OIL LEVEL (medium rate chime)
    • DOOR AJAR (medium rate chime)
    • TIRE PRESS (medium rate chime)
    • TRUNK AJAR (medium rate chime)
    • WASHER FLUID (medium rate chime)

Refer to Indicator/Warning Message Description and Operation .