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Home >> Toyota >> 2021 >> 4Runner Trail, 4WD >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Airbag System - Diagnostic Codes (B1690-B1905) & Symptom Tests >> Airbag System >> DTC B1825: Short in Side Squib (LH) Circuit; DTC B1826: Open in Side Squib (LH) Circuit; DTC B1827: Short in Side Squib (LH) Circuit (to Ground); DTC B1828: Short in Side Squib (LH) Circuit (to +B) [08/2019 - ] >> Procedure

DTC B1825: Short in Side Squib (LH) Circuit; DTC B1826: Open in Side Squib (LH) Circuit; DTC B1827: Short in Side Squib (LH) Circuit (to Ground); DTC B1828: Short in Side Squib (LH) Circuit (to +B) [08/2019 - ]: Procedure

  1. CHECK FRONT SEAT SIDE AIRBAG LH (SIDE SQUIB LH) 
    1. Turn the ignition switch off.
      GTY693714Courtesy 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 LH.
    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 LH (side 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 B1825, B1826, B1827 or B1828 is output

      HINT: 

      Codes other than DTC B1825, B1826, B1827 and B1828 may be output at this time, but they are not related to this check.

      TEXT IN ILLUSTRATION

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

    Result: 

    NG 

    REPLACE FRONT SEAT SIDE AIRBAG ASSEMBLY LH 

    (Refer to REMOVAL [08/2015 - ] )

    Result: 

    OK 

    See step  2

  2. CHECK NO. 2 FLOOR WIRE (SIDE SQUIB LH CIRCUIT) 
    1. Turn the ignition switch off.
      GTY699335Courtesy 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
      O2-1 (SFL+) - Body ground Ignition switch ON Below 1 V
      O2-2 (SFL-) - 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
      O2-1 (SFL+) - O2-2 (SFL-) 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
      O2-1 (SFL+) - O2-2 (SFL-) Always 1 MΩ or higher
      O2-1 (SFL+) - Body ground Always 1 MΩ or higher
      O2-2 (SFL-) - Body ground Always 1 MΩ or higher
      TEXT IN ILLUSTRATION

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

    Result: 

    NG 

    REPLACE NO. 2 FLOOR WIRE 

    Result: 

    OK 

    See step  3

  3. CHECK AIRBAG SENSOR ASSEMBLY 
    1. Connect the connectors to the front seat side airbag 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 B1825, B1826, B1827 or B1828 is not output.

      HINT: 

      Codes other than DTC B1825, B1826, B1827 and B1828 may be output at this time, but they are not related to this check.

      TEXT IN ILLUSTRATION

      *1 Side 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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