System Description

GENERAL DESCRIPTION
1. In the occupant classification system, the occupant classification ECU calculates the weight of the front passenger based on a signal from the occupant classification sensor. If this system judges the occupant to be a child, the front passenger airbag and front seat side airbag RH will be disabled.
2. This system is mainly composed of the occupant classification sensor that detects the load on the front passenger seat. The occupant classification ECU controls the system, and the passenger airbag ON/OFF indicator indicates the ON/OFF condition of the front passenger airbag and front seat side airbag RH.
OCCUPANT CLASSIFICATION SENSOR
1. The occupant classification sensor consists of the gel mat and the pressure sensor.
  When weight is applied to the gel mat, the pressure applied through the silicone to the pressure sensor changes. The pressure sensor converts these changes into voltages and transmits them to the occupant classification ECU.
  
  Fig 1: Identifying Occupant Classification ECU & Occupant Classification Sensor Location
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. The occupant classification sensor is installed between the seat cushion frame and seat cushion pad. The pressure sensor is installed on the seat frame.
3. The pressure sensor detects the pressure applied to the front passenger seat as a passenger is seated. The occupant classification ECU determines whether the front passenger airbag and front seat side airbag RH should be deployed based on signals from the pressure sensor.
SEAT BELT TENSION SENSOR
1. The seat belt tension sensor is installed on the front seat outer belt to detect a CRS (Child Restraint System).