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Home >> Toyota >> 2008 >> FJ Cruiser RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 34 (Supplemental Restraint System) >> Airbag System >> DTC B0126/27, B0127/27: Seat Belt Buckle Switch LH Circuit Malfunction (2006/01-); Seat Belt Buckle Switch LH Malfunction (2006/01-) >> Inspection Procedure

Inspection Procedure

WARNING: This page is about a different car, the 2006 Toyota Land Cruiser. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK WIRE HARNESS (TO GROUND) 
    1. Turn the ignition switch OFF.
    2. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
    3. Measure the resistance of the wire harness side connector.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION TABLE

      Tester Connection Specified Condition
      C25-19 (LBE+)*1 - Body ground 1 MΩ or higher
      C25-2 (LBE-)*1 - Body ground 1 MΩ or higher
      C25-11 (LBE+)*2 - Body ground 1 MΩ or higher
      C25-7 (LBE-)*2 - Body ground 1 MΩ or higher

      HINT:

      *1: w/Side airbag *2: w/o Side airbag

    NG: Go to step   6 

    Fig 1: Checking Wire Harness (To Ground)
    G04437993Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: GO TO NEXT STEP 

  2. CHECK WIRE HARNESS (TO +B) 
    1. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
    2. Turn the ignition switch ON.
    3. Measure the voltage of the wire harness side connector.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION TABLE

      Tester Connection Specified Condition
      C25-19 (LBE+)*1 - Body ground Below 1 V
      C25-2 (LBE-)*1 - Body ground Below 1 V
      C25-11 (LBE+)*2 - Body ground Below 1 V
      C25-7 (LBE-)*2 - Body ground Below 1 V

      HINT:

      *1: w/Side airbag *2: w/o Side airbag

    NG: Go to step   7 

    Fig 2: Checking Wire Harness (To +B)
    G04437994Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: GO TO NEXT STEP 

  3. CHECK FRONT SEAT INNER BELT ASSEMBLY LH 
    1. Connect the connector of the front seat inner belt LH (seat belt buckle switch LH).
    2. Unfasten the seat belt for the driver's seat.
    3. Measure the resistance of the wire harness side connector.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION TABLE

      Tester Connection Specified Condition
      C25-19 (LBE+)*1 - C25-2 (LBE-)*1 1 kΩ to 1.6 kΩ
      C25-11 (LBE+)*2 - C25-7 (LBE-)*2 1 kΩ to 1.6 kΩ

      HINT:

      *1: w/Side airbag *2: w/o Side airbag

    NG: REPLACE FRONT SEAT INNER BELT ASSEMBLY LH 

    Fig 3: Checking Front Seat Inner Belt Assembly LH
    G04437995Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: GO TO NEXT STEP 

  4. CHECK FRONT SEAT INNER BELT ASSEMBLY LH 
    1. Fasten the seat belt for the driver's seat.
    2. Measure the resistance of the wire harness side connector.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION TABLE

      Tester Connection Specified Condition
      C25-19 (LBE+)*1 - C25-2 (LBE-)*1 100 Ω to 500 Ω
      C25-11 (LBE+)*2 - C25-7 (LBE-)*2 100 Ω to 500 Ω

      HINT:

      *1: w/Side airbag *2: w/o Side airbag

    NG: REPLACE FRONT SEAT INNER BELT ASSEMBLY LH 

    Fig 4: Checking Front Seat Inner Belt Assembly LH
    G04437996Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: GO TO NEXT STEP 

  5. CHECK CENTER AIRBAG SENSOR ASSEMBLY 
    1. Turn the ignition switch OFF.
    2. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
    3. Connect the connector to the center airbag sensor.
    4. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
    5. Turn the ignition switch ON, and wait for at least 10 seconds.
    6. Clear the DTC stored in memory (see DTC CHECK/CLEAR  ).
    7. Turn the ignition switch OFF, and wait for at least 10 seconds.
    8. Turn the ignition switch ON, and wait for at least 10 seconds.
    9. Check the DTC (see DTC CHECK/CLEAR  ).

      OK: DTC B0126/B0127/27 is not output. 

    NG: REPLACE CENTER AIRBAG SENSOR ASSEMBLY 

    Fig 5: Identifying DLC3 Connector Terminals
    G04437997Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: USE SIMULATION METHOD TO CHECK 

  6. CHECK FRONT SEAT WIRE LH (TO GROUND) 
    1. Disconnect the front seat wire LH connector from the No. 1 floor wire.
    2. Measure the resistance of the wire harness side connector.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION TABLE

      Tester Connection Specified Condition
      BM4-3 (LBE+)*1 - Body ground 1 MΩ or higher
      BM4-6 (LBE-)*1 - Body ground 1 MΩ or higher
      BM4-3 (LBE+)*2 - Body ground 1 MΩ or higher
      BM4-6 (LBE-)*2 - Body ground 1 MΩ or higher

      HINT:

      *1: w/Side airbag *2: w/o Side airbag

    NG: REPAIR OR REPLACE FRONT SEAT WIRE LH 

    Fig 6: Checking Front Seat Wire LH (To Ground)
    G04437998Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: REPAIR OR REPLACE NO. 1 FLOOR WIRE 

  7. CHECK FRONT SEAT WIRE LH (TO +B) 
    1. Turn the ignition switch OFF.
    2. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
    3. Disconnect the front seat wire LH connector from the No. 1 floor wire.
    4. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
    5. Turn the ignition switch ON.
    6. Measure the voltage of the wire harness side connector.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION TABLE

      Tester Connection Specified Condition
      BM4-3 (LBE+)*1 - Body ground Below 1 V
      BM4-6 (LBE-)*1 - Body ground Below 1 V
      BM4-3 (LBE+)*2 - Body ground Below 1 V
      BM4-6 (LBE-)*2 - Body ground Below 1 V

      HINT:

      *1: w/Side airbag *2: w/o Side airbag

    NG: REPAIR OR REPLACE FRONT SEAT WIRE LH 

    Fig 7: Checking Front Seat Wire LH (To +B)
    G04437999Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: REPAIR OR REPLACE NO. 1 FLOOR WIRE 

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