System Description

WARNING: This page is about a different car, the 2013 Toyota RAV4. However, it is still accessible from the selected car via links, so may be relevant.

GENERAL
1. The front passenger occupant classification system judges whether the front passenger seat is occupied or not in accordance with the seat belt buckle switch status; and whether the seat is occupied by an adult or child (with child seat) in accordance with the load that is applied to the front passenger seat. Thus, when appropriate, it restricts the deployment of the front passenger airbag and the front seat airbag RH. In addition, the system informs the driver of the result of the judgment through the use of the passenger airbag ON/OFF indicator.
  
  Fig 1: Occupant Classification System Diagram
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

MAIN COMPONENTS

Component	Description
Occupant Classification Sensor	Outputs voltages to occupant detection ECU in accordance with load applied to sensor
Occupant Detection ECU	Constantly monitors weight of front passenger seat load, and judges occupancy condition in accordance with signals from occupant classification sensors and front seat belt buckle switch RH
Passenger Airbag ON/OFF Indicator	Passenger airbag "ON" indicator illuminates when front passenger side airbag and front seat airbag RH activated. Airbag "OFF" indicator illuminates when front passenger side airbag and front seat airbag RH deactivated.
Front Seat Inner Belt RH (Front Seat Belt Buckle Switch RH)	Detects whether seat belt is fastened and outputs appropriate signals to occupant detection ECU