Key In Ignition Reminder

The radio activates the key-in-ignition audible warning as requested by the Body Control Module (BCM). The BCM 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 BCM determines that the driver's door is open (signal circuit is low).
^ The BCM determines that the ignition key alarm switch is closed (signal circuit is low).