- Turns ON seat belt warning lamp, when the Occupant Classification System judges adult or child in the front passenger seat and the passenger seat belt buckle switch is OFF.
- Operation of air bag diagnosis sensor unit when air bag diagnosis sensor unit receives information from Occupant Classification System.
- In addition, seat belt warning lamp illuminates, when the driver side seat belt is not fasten. This does not relate to the air bag diagnosis sensor unit.
- For driver seat belt function, refer to System Diagram

Status (front passenger seat) | Seat belt warning lamp (When front passenger seat is unbuckled)
Empty | OFF
An object | OFF
Child/ child-seat | ON
Adult | ON
Malfunction | OFF