Key Reminder Switch: Description and Operation

Key-In-Ignition Warning Chime
When the key-in-ignition switch closes, it grounds an input to the instrument cluster, which then sounds a warning chime, provided that the ignition switch is off and the driver door is open. The instrument cluster will sound a steady tone, which will continue unless the key is removed, the ignition switch is rotated to the RUN position or the driver door is closed.