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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 B1905-74: Short in Front Passenger Side Pretensioner Squib Circuit; DTC B1906-74: Open in Front Passenger Side Pretensioner Squib Circuit; DTC B1907-74: Short to GND in Front Passenger Side Pretensioner Squib Circuit; DTC B1908-74: Short to B+ in Front Passenger Side Pretensioner Squib Circuit [08/2015 - 08/2017] >> Procedure

DTC B1905-74: Short in Front Passenger Side Pretensioner Squib Circuit; DTC B1906-74: Open in Front Passenger Side Pretensioner Squib Circuit; DTC B1907-74: Short to GND in Front Passenger Side Pretensioner Squib Circuit; DTC B1908-74: Short to B+ in Front Passenger Side Pretensioner Squib Circuit [08/2015 - 08/2017]: Procedure

  1. 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. Check that the connector is properly connected to the front seat outer belt RH.

      OK

      The connector is properly connected.

      HINT: 

      If the connector is not connected securely, reconnect the connector and proceed to the next inspection.

    4. Disconnect the connector from the front seat outer belt RH.
    5. Check that the No. 2 floor wire connector (on the front seat outer belt RH side) is not damaged.

      OK

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

    Result: 

    NG 

    REPLACE NO. 2 FLOOR WIRE 

    Result: 

    OK 

    See step  2

  2. CHECK FRONT SEAT OUTER BELT RH (FRONT PRETENSIONER SQUIB RH) 
    1. Connect the white wire side of SST (resistance: 2.1 Ω) to connector C.
      GTY556280Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      WARNING:

      Never connect the tester to the front seat outer belt RH (front pretensioner squib RH) 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 
    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 [08/2015 - 08/2017] ).
    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 [08/2015 - 08/2017] ).

      OK

      DTC B1905, B1906, B1907, B1908 or 74 is not output.

      HINT: 

      Codes other than DTC B1905, B1906, B1907, B1908 and 74 may be output at this time, but they are not related to this check.

    Result: 

    OK 

    REPLACE FRONT SEAT OUTER BELT ASSEMBLY RH 

    (Refer to REMOVAL [08/2015 - 08/2019] )

    Result: 

    NG 

    See step  3

  3. 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 connector is properly connected to the center airbag sensor assembly.

      OK

      The connector is properly connected.

      HINT: 

      If the connector is not connected securely, reconnect the connector and proceed to the next inspection.

    5. Disconnect the connector from the center airbag sensor assembly.
    6. Check that the terminal of the connector is not damaged.

      OK

      The terminal is not deformed or damaged.

    7. Check that the short spring for the No. 2 floor wire connector with the activation prevention mechanism is not deformed or damaged.

      OK

      The short spring is not deformed or damaged.

    Result: 

    NG 

    REPLACE NO. 2 FLOOR WIRE 

    Result: 

    OK 

    See step  4

  4. CHECK NO. 2 FLOOR WIRE (FRONT PRETENSIONER SQUIB RH CIRCUIT) 
    1. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
      GTY607574Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Turn the ignition switch to ON.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      P8-1 (R+) - Body ground Ignition switch ON Below 1 V
      P8-2 (R-) - 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
      P8-1 (R+) - P8-2 (R-) Always Below 1 Ω
    7. Release the activation prevention mechanism built into connector B (Refer to DIAGNOSIS SYSTEM [08/2015 - 08/2017] ).
    8. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      P8-1 (R+) - P8-2 (R-) Always 1 MΩ or higher
      P8-1 (R+) - Body ground Always 1 MΩ or higher
      P8-2 (R-) - Body ground Always 1 MΩ or higher

    Result: 

    NG 

    REPLACE NO. 2 FLOOR WIRE 

    Result: 

    OK 

    See step  5

  5. CHECK CENTER AIRBAG SENSOR 
    1. Restore the released activation prevention mechanism of connector B to the original condition.
      GTY581169Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Connect the connectors to the front seat outer belt RH and the center airbag sensor.
    3. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
    4. Turn the ignition switch to ON, and wait for at least 60 seconds.
    5. Clear the DTCs stored in the memory (Refer to DTC CHECK / CLEAR [08/2015 - 08/2017] ).
    6. Turn the ignition switch off.
    7. Turn the ignition switch to ON, and wait for at least 60 seconds.
    8. Check the DTCs (Refer to DTC CHECK / CLEAR [08/2015 - 08/2017] ).

      OK

      DTC B1905, B1906, B1907, B1908 or 74 is not output.

      HINT: 

      Codes other than DTC B1905, B1906, B1907, B1908 and 74 may be output at this time, but they are not related to this check.

    Result: 

    OK 

    USE SIMULATION METHOD TO CHECK 

    (Refer to DIAGNOSIS SYSTEM [08/2015 - 08/2017] )

    Result: 

    NG 

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY 

    (Refer to REMOVAL [08/2015 - 08/2017] )

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