Key Reminder Switch: Description and Operation

The Key-In chime is used to indicate to the operator that the key is in the ignition with the drivers door OPEN. If the key is in the ignition a ground path is completed from the G26 circuit at the Body Control Module (BCM) through the CLOSED key-in switch, to the Z1 circuit. The Z1 circuit is the ground circuit and terminates at the instrument panel left side cowl.

When the drivers door is open the normally OPEN door ajar switch CLOSES completing a path to ground on circuit G75. The BCM processes this information and turns on the chime.