SEAT BELT WARNING CHIME: System Description: Description

WARNING: This page is about a different car, the 2013 Nissan Armada. However, it is still accessible from the selected car via links, so may be relevant.

With ignition switch turned ON and driver seat belt unfastened, seat belt warning chime will sound for approximately 6 seconds.

BCM receives seat belt buckle switch signal from combination meter with CAN communication line.
BCM detects ignition switch turned ON and seat belt buckle pre-tensioner assemble LH (seat belt buckle switch) ON. And then transmits buzzer output signal (seat belt warning chime) to combination meter with CAN communication line.
When combination meter receives buzzer output signal (seat belt warning chime), it sounds the buzzer.