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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 B1825-56: Short in Side Squib LH Circuit; DTC B1826-56: Open in Side Squib LH Circuit; DTC B1827-56: Short to GND in Side Squib LH Circuit; DTC B1828-56: Short to B+ in Side Squib LH Circuit [08/2015 - 08/2019] >> Procedure

DTC B1825-56: Short in Side Squib LH Circuit; DTC B1826-56: Open in Side Squib LH Circuit; DTC B1827-56: Short to GND in Side Squib LH Circuit; DTC B1828-56: Short to B+ in Side Squib LH Circuit [08/2015 - 08/2019]: Procedure

  1. CHECK FRONT SEAT AIRBAG LH (FRONT SIDE SQUIB LH) 
    1. Turn the engine switch off.
      GTY628771Courtesy 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 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 airbag LH (front 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 engine switch on (IG), and wait for at least 60 seconds.
    7. Clear the DTCs (Refer to DTC CHECK / CLEAR [08/2015 - 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 [08/2015 - 08/2019] ).
      RESULT

      Result Proceed to
      DTC B1825, B1826, B1827 or B1828 is not output A
      DTC B1825, B1826, B1827 or B1828 is output B

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

    Result: 

    A 

    REPLACE FRONT SEAT AIRBAG ASSEMBLY LH 

    (Refer to REMOVAL [08/2015 - ] )

    Result: 

    B 

    See step  2

  2. CHECK CONNECTOR 
    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 No. 2 floor wire connectors (on the front seat airbag LH side) are not damaged.

      OK

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

      GTY681679Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *1 Front Side Squib LH
      *2 Center Airbag Sensor

    Result: 

    NG 

    REPLACE NO. 2 FLOOR WIRE 

    Result: 

    OK 

    See step  3

  3. CHECK NO. 2 FLOOR WIRE (FRONT SIDE SQUIB LH CIRCUIT) 
    1. Disconnect the connectors from the center airbag sensor.
      GTY645639Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      R8-1 (SFL+) - Body ground Engine switch on (IG) Below 1 V
      R8-2 (SFL-) - 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
      R8-1 (SFL+) - R8-2 (SFL-) Always Below 1 Ω
    7. Release the activation prevention mechanism built into connector B (Refer to DIAGNOSIS SYSTEM [08/2015 - 08/2019] ).
    8. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      R8-1 (SFL+) - R8-2 (SFL-) Always 1 MΩ or higher
      R8-1 (SFL+) - Body ground Always 1 MΩ or higher
      R8-2 (SFL-) - Body ground Always 1 MΩ or higher
      TEXT IN ILLUSTRATION

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

    Result: 

    NG 

    REPLACE NO. 2 FLOOR WIRE 

    Result: 

    OK 

    See step  4

  4. CHECK CENTER AIRBAG SENSOR 
    1. Connect the connectors to the front seat airbag LH and center airbag sensor.
      GTY400510Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    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 [08/2015 - 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 [08/2015 - 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 Front Side Squib LH
      *2 Center Airbag Sensor

    Result: 

    OK 

    USE SIMULATION METHOD TO CHECK 

    (Refer to DIAGNOSIS SYSTEM [08/2015 - 08/2019] )

    Result: 

    NG 

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY 

    (Refer to REMOVAL [08/2015 - ] )

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