GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2001 🢒 Eldorado 🢒 Body and Accessories 🢒 Instrument Panel, Gauges, and Console 🢒 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. 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 sends a class 2 message to the radio indicating the chime frequency (medium rate) and duration (continuous). The door ajar warning sounds and the appropriate door ajar indicator illuminates in the DIC when the following occurs:

    • The body control module (PZM) determines that a door is open (signal is low). The IPC receives a class 2 message from the PZM indicating the door ajar status.
    • The vehicle speed is greater than 4.8 km/h (3 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.

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 (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 driver's 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 radio activates the key-in-ignition audible warning as requested by the IPC. The IPC 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 body control module (PZM) determines that the driver's door is open (signal circuit is low). The IPC receives a class 2 message from the PZM indicating the door ajar status.
    • The IPC determines that the key-in-ignition switch is open (signal circuit is high).

Lights On Warning

The radio activates the lights on 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 lights on warning sounds when the following occurs:

    • The IPC determines that the ignition key has been removed from the ignition lock cylinder.
    • The body control module (PZM) determines that the driver's door is open (signal circuit is low). The IPC receives a class 2 message from the PZM indicating the door ajar status.
    • The IPC determines that the headlamp switch is in the park or head position.

Additional Warnings

The following warnings have an associated IPC indicator or DIC indicator:

    • Engine Coolant
        The radio activates the audible warning as requested by the IPC. The IPC sends a class 2 message to the radio indicating the chime frequency (medium rate) and duration (five chimes).
    • Engine Oil Pressure
        The radio activates the audible warning as requested by the IPC. The IPC sends a class 2 message to the radio indicating the chime frequency (medium rate) and duration (five chimes).
    • ENGINE OVERHEATED STOP ENGINE -- 42
        The radio activates the audible warning as requested by the IPC. The IPC sends a class 2 message to the radio indicating the chime frequency (medium rate) and duration (continuous).
    • OIL PRESSURE LOW STOP ENGINE -- 35
        The radio activates the audible warning as requested by the IPC. The IPC sends a class 2 message to the radio indicating the chime frequency (medium rate) and duration (five chimes).
    • TURN SIGNAL ON -- 20
        The radio activates the audible warning as requested by the IPC. The IPC sends a class 2 message to the radio indicating the chime duration (single chime per turn signal pulse).

Refer to Indicator/Warning Message Description and Operation .