The instrument panel cluster (IPC) monitors various inputs
(discrete circuits and/or class 2 message) in order to determine when
to command the radio (IRC) to activate an audible warning via the class 2
serial data line. The following audible warnings are controlled by the IPC:
| • | Door Ajar Warning (one pulse chime) -- The IPC sends a class 2
message requesting the IRC to activate the chime when the IPC determines
that the following conditions exist: |
| - | The vehicle speed is approximately 10 mph. |
| - | The left front door is ajar or open. |
| • | Engine Coolant Temperature Warning (medium chime) -- When
the powertrain control module (PCM) determines that the coolant temperature
has exceeded approximately 131°C (270°F), the PCM sends a class 2
message. When the IPC receives the message, the IPC displays the ENGINE OVERHEATED-STOP
ENGINE message on the driver message center. The PCM sends a class 2
message requesting the IRC to activate the chime. |
| • | Key-In Ignition Warning (medium chime) -- When the ignition
key is in the steering column lock cylinder and the IPC determines via a class 2
message from the body control module (PZM) that the left front door is open,
the IPC sends a class 2 message requesting the IRC to activate the
chime. |
| • | Lamps On Warning (fast chime) -- The IPC sends a class 2
message requesting the IRC to activate the chime when the IPC determines
that the following conditions exist: |
| - | The park lamps have been manually turned ON. |
| - | The ignition key is not in the steering column lock cylinder. |
| - | The left front door is open. |
| • | Low Oil Pressure Warning (medium chime) -- If the oil pressure
drops below approximately 20.5 kPa (3 psi) with the engine running,
the PCM sends a class 2 message. The IPC receives the message and
performs the following actions: |
| - | The engine oil pressure indicator is illuminated. |
| - | The STOP ENGINE-LOW OIL PRESSURE message is displayed on the driver
message center. |
| - | A class 2 message is sent to the IRC in order to activate
the chime. |
| • | Turn Signal On Warning (fast chime) -- When the IPC determines
that the turn signals are ON and the vehicle has been driven continuously
for approximately 1 mile, the IPC sends a class 2 message
requesting the IRC to activate the chime. |
| • | Vehicle Overspeed (slow chime) -- For SAUDI. |
Refer to the appropriate sections for more information:
| • | For wiring schematics, refer to Audible Warnings Schematics. |
| • | For diagnosis, refer to Audible Warnings Diagnostic System Check. |
| • | For circuit operation, refer to Audible Warnings Circuit Description. |
