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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 B1815-54: Short in Front Passenger Side Squib 2nd Step Circuit; DTC B1816-54: Open in Front Passenger Side Squib 2nd Step Circuit; DTC B1817-54: Short to GND in Front Passenger Side Squib 2nd Step Circuit; DTC B1818-54: Short to B+ in Front Passenger Side Squib 2nd Step Circuit [08/2015 - 08/2019] >> Procedure

DTC B1815-54: Short in Front Passenger Side Squib 2nd Step Circuit; DTC B1816-54: Open in Front Passenger Side Squib 2nd Step Circuit; DTC B1817-54: Short to GND in Front Passenger Side Squib 2nd Step Circuit; DTC B1818-54: Short to B+ in Front Passenger Side Squib 2nd Step Circuit [08/2015 - 08/2019]: Procedure

  1. CHECK INSTRUMENT PANEL PASSENGER AIRBAG (FRONT PASSENGER SIDE SQUIB 2ND STEP) 
    1. Turn the engine switch off.
      GTY638620Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
    3. Disconnect the connectors from the instrument panel passenger airbag.
    4. Connect the white wire side of SST (resistance: 2.1 Ω) to connector E (black connector).
      WARNING:

      Never connect the tester to the instrument panel passenger airbag (front passenger side squib 2nd step) 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] ).

      OK

      DTC B1815, B1816, B1817 or B1818 is not output.

      HINT: 

      Codes other than DTC B1815, B1816, B1817 and B1818 may be output at this time, but they are not related to this check.

      TEXT IN ILLUSTRATION

      *1 Front Passenger Side Squib 2nd Step
      *2 Center Airbag Sensor
      *3 Connector E
      *4 SST
      *a Front view of wire harness connector
      (to Front Passenger Side Squib 2nd Step)
      *b Color: Black

    Result: 

    OK 

    REPLACE INSTRUMENT PANEL PASSENGER AIRBAG ASSEMBLY 

    (Refer to REMOVAL [08/2015 - 08/2017] , or refer to REMOVAL [08/2017 - ] )

    Result: 

    NG 

    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 E.
    4. Check that the instrument panel wire connectors (on the instrument panel passenger airbag side) are not damaged.

      OK

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

      GTY676870Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *1 Front Passenger Side Squib 2nd Step
      *2 Center Airbag Sensor

    Result: 

    NG 

    REPLACE NO. 2 INSTRUMENT PANEL WIRE 

    Result: 

    OK 

    See step  3

  3. CHECK FRONT PASSENGER SIDE SQUIB 2ND STEP CIRCUIT 
    1. Disconnect the connectors from the center airbag sensor.
      GTY628926Courtesy 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
      F2-2 (P2+) - Body ground Engine switch on (IG) Below 1 V
      F2-1 (P2-) - 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
      F2-2 (P2+) - F2-1 (P2-) 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
      F2-2 (P2+) - F2-1 (P2-) Always 1 MΩ or higher
      F2-2 (P2+) - Body ground Always 1 MΩ or higher
      F2-1 (P2-) - Body ground Always 1 MΩ or higher
      TEXT IN ILLUSTRATION

      *1 Front Passenger Side Squib 2nd Step
      *2 Center Airbag Sensor
      *3 Connector E
      *a Front view of wire harness connector
      (to Front Passenger Side Squib 2nd Step)
      *b Color: Black

    Result: 

    NG 

    See step  5

    Result: 

    OK 

    See step  4

  4. CHECK CENTER AIRBAG SENSOR 
    1. Connect the connectors to the instrument panel passenger airbag and center airbag sensor.
      GTY407554Courtesy 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 B1815, B1816, B1817 or B1818 is not output.

      HINT: 

      Codes other than DTC B1815, B1816, B1817 and B1818 may be output at this time, but they are not related to this check.

      TEXT IN ILLUSTRATION

      *1 Front Passenger Side Squib 2nd Step
      *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 - ] )

  5. CHECK INSTRUMENT PANEL WIRE (CENTER AIRBAG SENSOR - NO. 2 INSTRUMENT PANEL WIRE) 
    1. Restore the released activation prevention mechanism of connector B to its original condition.
      GTY656577Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the instrument panel wire connector from the No. 2 instrument panel wire.
    3. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      GF1-3 (P2+) - Body ground Engine switch on (IG) Below 1 V
      GF1-4 (P2-) - Body ground Engine switch on (IG) Below 1 V
    5. Turn the engine switch off.
    6. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
    7. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      GF1-3 (P2+) - GF1-4 (P2-) Always Below 1 Ω
    8. Release the activation prevention mechanism built into connector B (Refer to DIAGNOSIS SYSTEM [08/2015 - 08/2019] ).
    9. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      GF1-3 (P2+) - GF1-4 (P2-) Always 1 MΩ or higher
      GF1-3 (P2+) - Body ground Always 1 MΩ or higher
      GF1-4 (P2-) - Body ground Always 1 MΩ or higher
      TEXT IN ILLUSTRATION

      *1 Front Passenger Side Squib 2nd Step
      *2 No. 2 Instrument Panel Wire
      *3 Instrument Panel Wire
      *4 Center Airbag Sensor
      *5 Connector C
      *a Front view of wire harness connector
      (to No. 2 Instrument Panel Wire)

    Result: 

    OK 

    REPLACE NO. 2 INSTRUMENT PANEL WIRE 

    Result: 

    NG 

    REPLACE INSTRUMENT PANEL WIRE 

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