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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 B1855: Short in Rear Side Squib LH Circuit; DTC B1856: Open in Rear Side Squib LH Circuit; DTC B1857: Short to GND in Rear Side Squib LH Circuit; DTC B1858: Short to B+ in Rear Side Squib LH Circuit [08/2019 - ] >> Procedure

DTC B1855: Short in Rear Side Squib LH Circuit; DTC B1856: Open in Rear Side Squib LH Circuit; DTC B1857: Short to GND in Rear Side Squib LH Circuit; DTC B1858: Short to B+ in Rear Side Squib LH Circuit [08/2019 - ]: Procedure

  1. CHECK REAR SEAT SIDE AIRBAG LH (REAR SIDE SQUIB LH) 
    GTY659923Courtesy 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 connector from the rear 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 rear seat side airbag LH (rear 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 [08/2019 - ] ).
    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 - ] ).
      RESULT

      Result Proceed to
      DTC B1855, B1856, B1857 or B1858 is not output A
      DTC B1855, B1856, B1857 or B1858 is output. B

      HINT: 

      Codes other than DTC B1855, B1856, B1857 and B1858 may be output at this time, but they are not related to this check.

      TEXT IN ILLUSTRATION

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

    Result: 

    A 

    REPLACE REAR SEATBACK ASSEMBLY LH 

    (Refer to REMOVAL [08/2016 - ] )

    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 rear seat side 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 Rear 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 (REAR SIDE SQUIB LH CIRCUIT) 
    1. Disconnect the connectors from the center airbag sensor.
      GTY629213Courtesy 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
      R13-1 (SRL+) - Body ground Engine switch on (IG) Below 1 V
      R13-2 (SRL-) - 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
      R13-1 (SRL+) - R13-2 (SRL-) 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
      R13-1 (SRL+) - R13-2 (SRL-) Always 1 MΩ or higher
      R13-1 (SRL+) - Body ground Always 1 MΩ or higher
      R13-2 (SRL-) - Body ground Always 1 MΩ or higher
      TEXT IN ILLUSTRATION

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

    Result: 

    NG 

    REPLACE NO. 2 FLOOR WIRE 

    Result: 

    OK 

    See step  4

  4. CHECK CENTER AIRBAG SENSOR 
    GTY400510Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Connect the connectors to the rear seat side airbag LH and the center airbag sensor.
    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 [08/2019 - ] ).
    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 B1855, B1856, B1857 or B1858 is not output.

      HINT: 

      Codes other than DTC B1855, B1856, B1857 and B1858 may be output at this time, but they are not related to this check.

      TEXT IN ILLUSTRATION

      *1 Rear Side Squib LH
      *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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