Key-In-Ignition Warning

WARNING: This page is about a different car, the 2002 Chevrolet Monte Carlo, 2002 Chevrolet Impala, 2001 Chevrolet Monte Carlo, and 2001 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.

Radio activates key-in-ignition audible warning as requested by Instrument Panel Cluster (IPC). IPC sends a class 2 message to radio indicating chime frequency of a medium rate and at a continuous duration. key-in-ignition warning sounds when following occurs:

Ignition switch is turned to OFF position.
Body Control Module (BCM) determines that driver's door is open and signal circuit is low. IPC receives a class 2 message from BCM indicating door ajar status.
BCM determines that key-in-ignition switch is open and signal circuit is high. IPC receives a class 2 message from BCM indicating key-in-ignition status