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Home >> Toyota >> 2019 >> Sequoia SR5, 4WD >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Supplemental Restraint System - Diagnostic Codes (3 Of 3) & 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 CONNECTORS 
    1. Turn the engine switch off.
      GTY760542Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Front Seat Outer Belt Assembly LH
      *2 Airbag Sensor Assembly
      *3 Floor Wire
    2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
    3. Check that the connectors are properly connected to the front seat outer belt assembly LH and airbag sensor assembly.

      OK

      The connectors are properly connected.

      HINT: 

      If the connectors are not properly connected, reconnect the connectors and proceed to the next inspection.

    4. Disconnect the connectors from the front seat outer belt assembly LH and airbag sensor assembly.
    5. Check that the terminals of the connectors are not deformed or damaged.

      OK

      The terminals are not deformed or damaged.

    6. Check that the floor wire connector (on the front seat outer belt assembly LH side) is not loose, deformed or damaged.

      OK

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

    7. Check that the short springs of the activation prevention mechanism of the floor wire connector are not deformed or damaged.

      OK

      The short springs are not deformed or damaged.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE FLOOR WIRE 

    Result: 

    OK 

    See step  2

  2. CHECK FRONT SEAT OUTER BELT ASSEMBLY LH 
    1. Connect the connector to the airbag sensor assembly.
      GTY758108Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Front Seat Outer Belt Assembly LH
      *2 Airbag Sensor Assembly
      *3 SST
      *a Front view of wire harness connector
      (to Front Seat Outer Belt Assembly LH)
    2. 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 assembly 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 
    3. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
    4. Turn the engine switch on (IG), and wait for at least 60 seconds.
    5. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [08/2019 - ]

    6. Turn the engine switch off.
    7. Turn the engine switch on (IG), and wait for at least 60 seconds.
    8. Check for DTCs.

      Refer to DTC CHECK / CLEAR [08/2019 - ]

      Result

      Result Proceed to
      DTC B1905, B1906, B1907 or B1908 is not output A
      DTC B1905, B1906, B1907 or B1908 is output B

      HINT: 

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

    9. Turn the engine switch off.
    10. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
    11. Disconnect SST from connector C.

    Result: 

    A 

    REPLACE FRONT SEAT OUTER BELT ASSEMBLY LH. Refer to  REMOVAL [08/2019 - ] 

    Result: 

    B 

    See step  3

  3. CHECK FLOOR WIRE 
    1. Disconnect the floor wire from the airbag sensor assembly.
      GTY765761Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Front Seat Outer Belt Assembly LH
      *2 Airbag Sensor Assembly
      *3 Floor Wire
      *a Front view of wire harness connector
      (to Front Seat Outer Belt Assembly LH)
      Release the activation prevention mechanism
    2. Check for a short to B+ in the circuit.
      1. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
      2. Turn the engine switch on (IG).
      3. Measure the voltage according to the value(s) in the table below.

        Standard Voltage

        Tester Connection Switch Condition Specified Condition
        O9-1 (L+) - Body ground Engine switch on (IG) Below 1 V
        O9-2 (L-) - Body ground Engine switch on (IG) Below 1 V
      4. Turn the engine switch off.
      5. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
    3. Check for an open in the circuit.
      1. Measure the resistance according to the value(s) in the table below.

        Standard Resistance

        Tester Connection Condition Specified Condition
        O9-1 (L+) - O9-2 (L-) Always Below 1 Ω
    4. Check for a short to ground in the circuit.
      1. Measure the resistance according to the value(s) in the table below.

        Standard Resistance

        Tester Connection Condition Specified Condition
        O9-1 (L+) - Body ground Always 1 MΩ or higher
        O9-2 (L-) - Body ground Always 1 MΩ or higher
    5. Check for a short in the circuit.
      1. Release the activation prevention mechanism built into connector B.

        Refer to SYSTEM DESCRIPTION [08/2017 - ]

      2. Measure the resistance according to the value(s) in the table below.

        Standard Resistance

        Tester Connection Condition Specified Condition
        O9-1 (L+) - O9-2 (L-) Always 1 MΩ or higher
      3. Restore the released activation prevention mechanism of connector B to the original condition.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE FLOOR WIRE 

    Result: 

    OK 

    See step  4

  4. CHECK DTC 
    1. Connect the connectors to the front seat outer belt assembly LH and airbag sensor assembly.
      GTY765809Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Front Seat Outer Belt Assembly LH
      *2 Airbag Sensor Assembly
    2. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
    3. Turn the engine switch on (IG), and wait for at least 60 seconds.
    4. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [08/2019 - ]

    5. Turn the engine switch off.
    6. Turn the engine switch on (IG), and wait for at least 60 seconds.
    7. Check for DTCs.

      Refer to DTC CHECK / CLEAR [08/2019 - ]

      Result

      Result Proceed to
      DTC B1905, B1906, B1907 or B1908 is not output A
      DTC B1905, B1906, B1907 or B1908 is output B

      HINT: 

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

    Result: 

    A 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [08/2019 - ] 

    Result: 

    B 

    REPLACE AIRBAG SENSOR ASSEMBLY. Refer to  REMOVAL [08/2019 - ] 

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