Key In Ignition Reminder

The radio receives a class 2 message from the IPC in order to activate a continuous, medium rate chime. The key in ignition audible warning is activated when the following occurs:
^ The key is in the ignition.
^ The IPC receives a class 2 message from the BCM indicating that the driver door is open, and the signal circuit is low.
^ The IPC determines that the key-in-ignition switch is closed. The signal circuit is low.