Circuit Description
WARNING: This page is about a different car, the 2002 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.
When the buckle switch of the driver's seat is ON with the ignition switch ON, the body ECU sends a signal to make the seat belt warning light for the driver's seat light up and to sound a buzzer.
When the buckle switch of the passenger seat is ON and the passenger seat belt occupant detecting sensor is ON with the ignition switch ON, the body ECU sends a signal to make the seat belt warning light for the passenger seat light up.