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Home >> Lexus >> 2021 >> GX 460 Luxury >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Supplemental Restraint System (Diagnostic Codes) (3 Of 3) & Symptom Tests >> Airbag System >> DTC B1920: Short in Rear P/T Squib (RH) Circuit; DTC B1921: Open in Rear P/T Squib (RH) Circuit; DTC B1922: Short in Rear P/T Squib (RH) Circuit (to Ground); DTC B1923: Short in Rear P/T Squib (RH) Circuit (to +B) [08/2019 - ] >> Procedure

DTC B1920: Short in Rear P/T Squib (RH) Circuit; DTC B1921: Open in Rear P/T Squib (RH) Circuit; DTC B1922: Short in Rear P/T Squib (RH) Circuit (to Ground); DTC B1923: Short in Rear P/T Squib (RH) Circuit (to +B) [08/2019 - ]: Procedure

  1. CHECK REAR NO. 1 SEAT OUTER BELT RH (REAR PRETENSIONER SQUIB RH) 
    GTY662873Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Turn the engine switch off.
    2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
    3. Disconnect the connectors from the rear No. 1 seat outer belt RH.
    4. Connect the white wire side of SST (resistance: 2.1 Ω) to connector C.
      WARNING:

      Never connect the tester to the rear No. 1 seat outer belt RH (rear 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 
    5. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
    6. Turn the engine switch on (IG), and wait for at least 60 seconds.
    7. Clear the DTCs stored in the memory (Refer to DTC CHECK / CLEAR [08/2019 - ] ).
    8. Turn the engine switch off.
    9. Turn the engine switch on (IG), and wait for at least 60 seconds.
    10. Check for DTCs (Refer to DTC CHECK / CLEAR [08/2019 - ] ).

      OK

      DTC B1920, B1921, B1922 or B1923 is not output.

      HINT: 

      Codes other than DTC B1920, B1921, B1922 and B1923 may be output at this time, but they are not related to this check.

      TEXT IN ILLUSTRATION

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

    Result: 

    OK 

    REPLACE REAR NO. 1 SEAT OUTER BELT ASSEMBLY RH 

    (Refer to REMOVAL [08/2015 - ] )

    Result: 

    NG 

    See step  2

  2. CHECK CONNECTORS 
    1. Turn the engine 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 rear No. 1 seat outer belt RH side) is not damaged.

      OK

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

      GTY646273Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *1 Rear Pretensioner Squib RH
      *2 Center Airbag Sensor

    Result: 

    NG 

    REPLACE FLOOR WIRE 

    Result: 

    OK 

    See step  3

  3. CHECK FLOOR WIRE (REAR PRETENSIONER SQUIB RH CIRCUIT) 
    GTY619138Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the connectors from the center airbag sensor.
    2. Connect the cable to the negative (-) battery terminal, and wait for at least 90 seconds.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      Q24-1 (RR+) - Body ground Engine switch on (IG) Below 1 V
      Q24-2 (RR-) - 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.
    6. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      Q24-1 (RR+) - Q24-2 (RR-) 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
      Q24-1 (RR+) - Q24-2 (RR-) Always 1 MΩ or higher
      Q24-1 (RR+) - Body ground Always 1 MΩ or higher
      Q24-2 (RR-) - Body ground Always 1 MΩ or higher
      TEXT IN ILLUSTRATION

      *1 Rear Pretensioner Squib RH
      *2 Floor Wire
      *3 Center Airbag Sensor
      *4 Connector C
      *a Front view of wire harness connector
      (to Rear Pretensioner Squib RH)

    Result: 

    NG 

    REPLACE FLOOR WIRE 

    Result: 

    OK 

    See step  4

  4. CHECK CENTER AIRBAG SENSOR 
    GTY409911Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Connect the connectors to the rear No. 1 seat outer belt RH and the center airbag sensor.
    2. Connect the cable to the negative (-) battery terminal, and wait for at least 90 seconds.
    3. Turn the engine switch on (IG), and wait for at least 60 seconds.
    4. Clear the DTCs stored in the memory (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 - ] ).

      OK

      DTC B1920, B1921, B1922 or B1923 is not output.

      HINT: 

      Codes other than DTC B1920, B1921, B1922 and B1923 may be output at this time, but they are not related to this check.

      TEXT IN ILLUSTRATION

      *1 Rear Pretensioner Squib RH
      *2 Center Airbag Sensor

    Result: 

    OK 

    USE SIMULATION METHOD TO CHECK 

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

    Result: 

    NG 

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY 

    (Refer to REMOVAL [08/2015 - ] )

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