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Home >> Toyota >> 2021 >> 4Runner TRD Off-Road >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Airbag System - Diagnostic Codes (B1690-B1905) & Symptom Tests >> Airbag System >> DTC B1905: Short in P/T Squib (LH) Circuit; DTC B1906: Open in P/T Squib (LH) Circuit; DTC B1907: Short in P/T Squib (LH) Circuit (to Ground); DTC B1908: Short in P/T Squib (LH) Circuit (to +B) [08/2019 - ] >> Procedure

DTC B1905: Short in P/T Squib (LH) Circuit; DTC B1906: Open in P/T Squib (LH) Circuit; DTC B1907: Short in P/T Squib (LH) Circuit (to Ground); DTC B1908: Short in P/T Squib (LH) Circuit (to +B) [08/2019 - ]: Procedure

  1. CHECK FRONT SEAT OUTER BELT LH (FRONT PRETENSIONER SQUIB LH) 
    1. Turn the ignition switch off.
      GTY688539Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
    3. Disconnect the connectors from the front seat outer belt LH.
    4. Connect the white wire side of SST (resistance: 2.1 Ω) to connector C.
      WARNING:

      Never connect the tester to the front seat outer belt LH (front pretensioner squib LH) for measurement, as this may lead to a serious injury due to airbag deployment.

      NOTE:
      • Do not forcibly insert SST into the terminals of the connector when connecting SST.
      • Insert SST straight into the terminals of the connector.
      • SST: 09843-18061 
    5. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
    6. Turn the ignition switch to ON, and wait for at least 60 seconds.
    7. Clear the DTCs (Refer to DTC CHECK / CLEAR [08/2019 - ] ).
    8. Turn the ignition switch off.
    9. Turn the ignition switch to ON, and wait for at least 60 seconds.
    10. Check for DTCs (Refer to DTC CHECK / CLEAR [08/2019 - ] ).

      OK

      DTC B1905, B1906, B1907 or B1908 is not output.

      HINT: 

      Codes other than DTC B1905, B1906, B1907 and B1908 may be output at this time, but they are not related to this check.

      TEXT IN ILLUSTRATION

      *1 Front Pretensioner Squib LH
      *2 Airbag Sensor Assembly
      *3 Connector C
      *4 SST
      *a Front view of wire harness connector
      (to Front Pretensioner Squib LH)

    Result: 

    OK 

    REPLACE FRONT SEAT OUTER BELT ASSEMBLY LH 

    (Refer to REMOVAL [08/2015 - ] )

    Result: 

    NG 

    See step  2

  2. CHECK CONNECTOR 
    1. Turn the ignition switch off.
    2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
    3. Disconnect SST from connector C.
    4. Check that the floor wire connector (on the front seat outer belt LH side) is not damaged.

      OK

      The lock button is not disengaged, and the claw of the lock is not deformed or damaged.

      GTY681679Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *1 Front Pretensioner Squib LH
      *2 Airbag Sensor Assembly

    Result: 

    NG 

    REPLACE NO. 2 FLOOR WIRE 

    Result: 

    OK 

    See step  3

  3. CHECK NO. 2 FLOOR WIRE (FRONT PRETENSIONER SQUIB LH CIRCUIT) 
    1. Disconnect the connectors from the airbag sensor assembly.
      GTY735140Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      O4-1 (L+) - Body ground Ignition switch ON Below 1 V
      O4-2 (L-) - Body ground Ignition switch ON Below 1 V
    4. Turn the ignition switch off.
    5. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
    6. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      O4-1 (L+) - O4-2 (L-) Always Below 1 Ω
    7. Release the activation prevention mechanism built into connector B (Refer to DIAGNOSIS SYSTEM [08/2019 - ] ).
    8. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      O4-1 (L+) - O4-2 (L-) Always 1 MΩ or higher
      O4-1 (L+) - Body ground Always 1 MΩ or higher
      O4-2 (L-) - Body ground Always 1 MΩ or higher
      TEXT IN ILLUSTRATION

      *1 Front Pretensioner Squib LH
      *2 No. 2 Floor Wire
      *3 Airbag Sensor Assembly
      *4 Connector C
      *a Front view of wire harness connector
      (to Front Pretensioner Squib LH)

    Result: 

    NG 

    REPLACE NO. 2 FLOOR WIRE 

    Result: 

    OK 

    See step  4

  4. CHECK AIRBAG SENSOR ASSEMBLY 
    1. Connect the connectors to the front seat outer belt LH and airbag sensor assembly.
      GTY725281Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
    3. Turn the ignition switch to ON, and wait for at least 60 seconds.
    4. Clear the DTCs (Refer to DTC CHECK / CLEAR [08/2019 - ] ).
    5. Turn the ignition switch off.
    6. Turn the ignition switch to ON, and wait for at least 60 seconds.
    7. Check for DTCs (Refer to DTC CHECK / CLEAR [08/2019 - ] ).

      OK

      DTC B1905, B1906, B1907 or B1908 is not output.

      HINT: 

      Codes other than DTC B1905, B1906, B1907 and B1908 may be output at this time, but they are not related to this check.

      TEXT IN ILLUSTRATION

      *1 Front Pretensioner Squib LH
      *2 Airbag Sensor Assembly

    Result: 

    OK 

    USE SIMULATION METHOD TO CHECK 

    (Refer to DIAGNOSIS SYSTEM [08/2019 - ] )

    Result: 

    NG 

    REPLACE AIRBAG SENSOR ASSEMBLY 

    (Refer to REMOVAL [08/2015 - ] )

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