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Home >> Toyota >> 2019 >> Sequoia SR5, 4WD >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Supplemental Restraint System - Diagnostic Codes (2 Of 3) >> 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 - 08/2017] >> 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 - 08/2017]: Procedure

  1. CHECK CONNECTOR 
    1. Turn the ignition switch off.
    2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
    3. Check that the connector is properly connected to the front passenger airbag.

      OK

      The connector is properly connected.

      HINT: 

      If the connector is not connected securely, reconnect the connector and proceed to the next inspection.

    4. Disconnect the connector from the front passenger airbag.
    5. Check that the No. 2 instrument panel wire connector (on the front passenger airbag side) is not damaged.

      OK

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

    Result: 

    NG 

    REPLACE NO. 2 INSTRUMENT PANEL WIRE 

    Result: 

    OK 

    See step  2

  2. CHECK FRONT PASSENGER AIRBAG (FRONT PASSENGER SIDE SQUIB 2ND STEP) 
    1. Connect the white wire side of SST (resistance: 2.1 Ω) to connector E (black connector).
      GTY588347Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      WARNING:

      Never connect the tester to the front 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 
    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 [08/2015 - 08/2017] ).
    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 [08/2015 - 08/2017] ).

      OK

      DTC B1815, B1816, B1817, B1818 or 54 is not output.

      HINT: 

      Codes other than DTC B1815, B1816, B1817, B1818 and 54 may be output at this time, but they are not related to this check.

    Result: 

    OK 

    REPLACE FRONT PASSENGER AIRBAG ASSEMBLY 

    (Refer to REMOVAL [08/2015 - 08/2019] )

    Result: 

    NG 

    See step  3

  3. CHECK CONNECTOR 
    1. Turn the ignition 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 connector is properly connected to the center airbag sensor assembly.

      OK

      The connector is properly connected.

      HINT: 

      If the connector is not connected securely, reconnect the connector and proceed to the next inspection.

    5. Disconnect the connector from the center airbag sensor assembly.
    6. Check that the terminal of the connector is not damaged.

      OK

      The terminal is not deformed or damaged.

    7. Check that the short spring for the instrument panel wire connector with the activation prevention mechanism is not deformed or damaged.

      OK

      The short spring is not deformed or damaged.

    Result: 

    NG 

    REPLACE INSTRUMENT PANEL WIRE 

    Result: 

    OK 

    See step  4

  4. CHECK FRONT PASSENGER SIDE SQUIB 2ND STEP CIRCUIT 
    1. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
      GTY549761Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Turn the ignition switch to ON.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      z9-1 (P2+) - Body ground Ignition switch ON Below 1 V
      z9-2 (P2-) - Body ground Ignition switch ON Below 1 V
    4. Turn the ignition 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
      z9-1 (P2+) - z9-2 (P2-) Always Below 1 Ω
    7. Release the activation prevention mechanism built into connector B (Refer to REMOVAL [08/2015 - 08/2017] ).
    8. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      z9-1 (P2+) - z9-2 (P2-) Always 1 MΩ or higher
      z9-1 (P2+) - Body ground Always 1 MΩ or higher
      z9-2 (P2-) - Body ground Always 1 MΩ or higher

    Result: 

    NG 

    See step  6

    Result: 

    OK 

    See step  5

  5. CHECK CENTER AIRBAG SENSOR 
    1. Restore the released activation prevention mechanism of connector B to the original condition.
      GTY165520Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Connect the connectors to the front passenger airbag and the center airbag sensor.
    3. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
    4. Turn the ignition switch to ON, and wait for at least 60 seconds.
    5. Clear the DTCs (Refer to DTC CHECK / CLEAR [08/2015 - 08/2017] ).
    6. Turn the ignition switch off.
    7. Turn the ignition switch to ON, and wait for at least 60 seconds.
    8. Check for DTCs (Refer to DTC CHECK / CLEAR [08/2015 - 08/2017] ).

      OK

      DTC B1815, B1816, B1817, B1818 or 54 is not output.

      HINT: 

      Codes other than DTC B1815, B1816, B1817, B1818 and 54 may be output at this time, but they are not related to this check.

    Result: 

    OK 

    USE SIMULATION METHOD TO CHECK 

    (Refer to DIAGNOSIS SYSTEM [08/2015 - 08/2017] )

    Result: 

    NG 

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY 

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

  6. CHECK CONNECTOR 
    1. Restore the released activation prevention mechanism of connector B to the original condition.
    2. Check that the connectors that link the instrument panel wire and No. 2 instrument panel wire harness are properly connected.

      OK

      The connectors are properly connected.

      HINT: 

      If the connectors are not connected securely, reconnect the connectors and proceed to the next inspection.

    3. Disconnect the connectors that link the instrument panel wire and No. 2 instrument panel wire.
    4. Check that the terminals of the connectors are not damaged.

      OK

      The terminals are not deformed or damaged.

    5. Check that the short spring for the No. 2 instrument panel wire connector with the activation prevention mechanism is not deformed or damaged.

      OK

      The short spring is not deformed or damaged.

    Result: 

    NG 

    REPLACE HARNESS AND CONNECTOR 

    Result: 

    OK 

    See step  7

  7. CHECK INSTRUMENT PANEL WIRE (CENTER AIRBAG SENSOR - NO. 2 INSTRUMENT PANEL WIRE) 
    1. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
      GTY560782Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Turn the ignition switch to ON.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      Hz1-3 - Body ground Ignition switch ON Below 1 V
      Hz1-4 - Body ground Ignition switch ON Below 1 V
    4. Turn the ignition 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
      Hz1-3 - Hz1-4 Always Below 1 Ω
    7. Release the activation prevention mechanism built into connector B (Refer to REMOVAL [08/2015 - 08/2017] ).
    8. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      Hz1-3 - Hz1-4 Always 1 MΩ or higher
      Hz1-3 - Body ground Always 1 MΩ or higher
      Hz1-4 - Body ground Always 1 MΩ or higher

    Result: 

    OK 

    REPLACE NO. 2 INSTRUMENT PANEL WIRE 

    Result: 

    NG 

    REPLACE INSTRUMENT PANEL WIRE 

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