Toyota Tundra Service Manual: System Description



(a) The occupant classification system determines whether the front passenger seat is occupied by an adult or child (with child seat) or is unoccupied, based on the load that is applied to the front passenger seat and whether the seat belt is buckled. The system restricts the deployment of the front passenger airbag, front passenger side airbag, and front passenger seat belt pretensioner in accordance with this judgment. The result is informed to the driver through the front airbag ON/OFF indicator illumination.


(a) This system consists of the occupant classification ECU, occupant detection sensors, front airbag ON/OFF indicator, passenger side seat belt buckle switches, and center airbag sensor.


(a) The occupant detection sensors are installed on 4 brackets, which connect the seat rail and the seat frame. The resistance values of these sensors, which vary in accordance with the load that acts on the brackets, are transmitted to the occupant classification ECU as signals. Upon receipt of the signals, the ECU determines the front passenger seat occupant conditions.

    Problem Symptoms Table

    System Diagram

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