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Home >> Toyota >> 2021 >> 4Runner Limited, AWD >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Airbag System - Diagnostic Codes (B1690-B1905) & Symptom Tests >> Airbag System >> DTC B1820: Short in Side Squib (RH) Circuit; DTC B1821: Open in Side Squib (RH) Circuit; DTC B1822: Short in Side Squib (RH) Circuit (to Ground); DTC B1823: Short in Side Squib (RH) Circuit (to +B) [08/2019 - ] >> Procedure

DTC B1820: Short in Side Squib (RH) Circuit; DTC B1821: Open in Side Squib (RH) Circuit; DTC B1822: Short in Side Squib (RH) Circuit (to Ground); DTC B1823: Short in Side Squib (RH) Circuit (to +B) [08/2019 - ]: Procedure

  1. CHECK FRONT SEAT SIDE AIRBAG RH (SIDE SQUIB RH) 
    1. Turn the ignition switch off.
      GTY693701Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
    3. Disconnect the connector from the front seat side airbag RH.
    4. Connect the red wire side of SST (resistance: 2.1 Ω) to connector C.
      WARNING:

      Never connect the tester to the front seat side airbag RH (side 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 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 B1820, B1821, B1822 or B1823 is output

      HINT: 

      Codes other than DTC B1820, B1821, B1822 and B1823 may be output at this time, but they are not related to this check.

      TEXT IN ILLUSTRATION

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

    Result: 

    NG 

    REPLACE FRONT SEAT SIDE AIRBAG ASSEMBLY RH 

    (Refer to REMOVAL [08/2015 - ] )

    Result: 

    OK 

    See step  2

  2. CHECK FLOOR WIRE (SIDE SQUIB RH CIRCUIT) 
    1. Turn the ignition switch off.
      GTY687612Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
    3. Disconnect SST from connector C.
    4. Disconnect the connectors from the airbag sensor assembly.
    5. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
    6. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      N2-1 (SFR+) - Body ground Ignition switch ON Below 1 V
      N2-2 (SFR-) - Body ground Ignition switch ON Below 1 V
    7. Turn the ignition switch off.
    8. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
    9. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      N2-1 (SFR+) - N2-2 (SFR-) Always Below 1 Ω
    10. Release the activation prevention mechanism built into connector B (Refer to DIAGNOSIS SYSTEM [08/2019 - ] ).
    11. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      N2-1 (SFR+) - N2-2 (SFR-) Always 1 MΩ or higher
      N2-1 (SFR+) - Body ground Always 1 MΩ or higher
      N2-2 (SFR-) - Body ground Always 1 MΩ or higher
      TEXT IN ILLUSTRATION

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

    Result: 

    NG 

    REPLACE FLOOR WIRE 

    Result: 

    OK 

    See step  3

  3. CHECK AIRBAG SENSOR ASSEMBLY 
    1. Connect the connectors to the front seat side airbag RH and airbag sensor assembly.
      GTY719520Courtesy 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 B1820, B1821, B1822 or B1823 is not output.

      HINT: 

      Codes other than DTC B1820, B1821, B1822 and B1823 may be output at this time, but they are not related to this check.

      TEXT IN ILLUSTRATION

      *1 Side Squib RH
      *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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