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Seat Belt Warning System: Inspection

  1. INSPECT FRONT SEAT INNER BELT ASSY LH 
    1. Inspect the buckle switch.
      1. Fasten the seat belt (Buckle switch is ON).
      2. Check the continuity or resistance between the terminals.

        Standard: 

        FRONT SEAT INNER BELT ASSY LH (BUCKLE SWITCH IS ON)

        Terminal No. Specified Condition
        A-1 <=> A-4 1,330 ohms
        A-1 <=> A-6 Continuity
        Fig 1: Fastening Seat Belt (Buckle Switch ON)
        G02962589Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      3. Release the seat belt (Buckle switch is OFF).
      4. Check the continuity or resistance between the terminals.

        Standard: 

        FRONT SEAT INNER BELT ASSY LH (BUCKLE SWITCH IS OFF)

        Terminal No. Specified Condition
        A-1 <=> A-4 330 Ω
        A-1 <=> A-6 No continuity
        Fig 2: Releasing Seat Belt (Buckle Switch OFF)
        G02962590Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        If the result is not as specified, replace the inner belt assy.

    2. Inspect the circuit for the airbag seat position sensor.
      1. Check the continuity between the terminals of connector A and the connector of the airbag seat position sensor.
        Fig 3: Airbag Seat Position Sensor Table
        G02962591Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        Standard: 

        Fig 4: Inspecting Circuit For Airbag Seat Position Sensor
        G02962592Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        If the result is not as specified, replace the inner belt assy.

  2. INSPECT FRONT SEAT INNER BELT ASSY RH 
    1. Inspect the buckle switch.
      1. Short the circuit between connector terminals 1 and 3 of the occupation detection sensor (Seat is occupied).
        Fig 5: Identifying Connector Terminals 1 & 3 Of Occupation Detection Sensor
        G02962593Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Fasten the seat belt (Buckle switch is ON).
      3. Check the continuity between the terminals.

        Standard: 

        FRONT SEAT INNER BELT ASSY RH (BUCKLE SWITCH ON)

        Terminal No. Specified Condition
        A-2 <=> A-3 No Continuity
        A-4 <=> A-3 No continuity
        A-2 <=> 1 (Connector of occupation detection sensor) Continuity
        A-3 <=> 3 (Connector of occupation detection sensor) No continuity
        A-4 <=> 3 (Connector of occupation detection sensor) Continuity
        Fig 6: Fastening Seat Belt (Buckle Switch ON)
        G02962594Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      4. Release the seat belt (Buckle switch is OFF).
      5. Check the continuity between the terminals.

        Standard: 

        FRONT SEAT INNER BELT ASSY RH (BUCKLE SWITCH OFF)

        Terminal No. Specified Condition
        A-2 <=> A-3 Continuity
        A-3 <=> A-4 Continuity
        A-2 <=> 1 (Connector of occupation detection sensor) Continuity
        A-3 <=> 3 (Connector of occupation detection sensor) Continuity
        A-4 <=> 3 (Connector of occupation detection sensor) Continuity
        Fig 7: Releasing Seat Belt (Buckle Switch OFF)
        G02962595Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        If the result is not as specified, replace the inner belt assy.

    2. Inspect the buckle switch.
      1. Disconnect the occupation detection sensor connector (Seat is not occupied).
        Fig 8: Disconnecting Occupation Detection Sensor Connector
        G02962596Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Fasten the seat belt (Buckle switch is ON).
      3. Check the continuity between the terminals.

        Standard: 

        BUCKLE SWITCH ON

        Terminal No. Specified Condition
        A-2 <=> A-3 No continuity
        A-4 <=> A-3 No continuity
        A-2 <=> 1 (Connector of occupation detection sensor) Continuity
        A-3 <=> 3 (Connector of occupation detection sensor) No continuity
        A-4 <=> 3 (Connector of occupation detection sensor) Continuity
        Fig 9: Fastening Seat Belt (Buckle Switch ON)
        G02962597Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      4. Release the seat belt (Buckle switch is OFF).
      5. Check the continuity between the terminals.

        Standard: 

        BUCKLE SWITCH OFF

        Terminal No. Specified Condition
        A-2 <=> A-3 No continuity
        A-3 <=> A-4 Continuity
        A-2 <=> 1 (Connector of occupation detection sensor) Continuity
        A-3 <=> 3 (Connector of occupation detection sensor) Continuity
        A-4 <=> 3 (Connector of occupation detection sensor) Continuity
        Fig 10: Releasing Seat Belt (Buckle Switch OFF)
        G02962598Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        If the result is not as specified, replace the inner belt assy.

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