Key-In-Ignition Warning

The radio activates the key-in-ignition audible warning as requested by the rear integration module (RIM). The RIM 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 ignition is off, the driver door module (DDM) determines that the driver's door is open (signal circuit is low). The RIM receives a class 2 message from the DDM indicating the door ajar status. The Instrument Panel Integration Module (IPM) determines that a key is in the ignition, opening the switch (signal circuit is high). The IPM receives a class 2 message from the RIM indicating the key-in-ignition status.