Seat Belt Warning Light & Chime
WARNING: This page is about a different car, the 2002 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.
The light and chime remind you to fasten seat belts. The light illuminates whenever the ignition key is turned to "ON", and will remain illuminated until the driver's seat belt is fastened. At the same time, the chime will sound for about six seconds unless the driver's seat belt is securely fastened.