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Home >> Toyota >> 2019 >> Sequoia SR5, 4WD >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Supplemental Restraint System - Diagnostic Codes (3 Of 3) & Symptom Tests >> Airbag System >> DTC B1820: Short in Side Squib (RH) Circuit; DTC B1821: Open in Side Squib (RH) Circuit; DTC B1822: Short in Side Squib (RH) Circuit (to Ground); DTC B1823: Short in Side Squib (RH) Circuit (to +B) [08/2017 - 08/2019] >> Procedure

DTC B1820: Short in Side Squib (RH) Circuit; DTC B1821: Open in Side Squib (RH) Circuit; DTC B1822: Short in Side Squib (RH) Circuit (to Ground); DTC B1823: Short in Side Squib (RH) Circuit (to +B) [08/2017 - 08/2019]: Procedure

  1. CHECK CONNECTORS 
    1. Turn the ignition switch off.
      GTY751176Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Front Seat Airbag Assembly RH
      *2 Airbag Sensor Assembly
      *3 No. 2 Floor Wire
    2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
    3. Check that the connectors are properly connected to the front seat airbag assembly RH and airbag sensor assembly.

      OK

      The connectors are properly connected.

      HINT: 

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

    4. Disconnect the connectors from the front seat airbag assembly RH and airbag sensor assembly.
    5. Check that the terminals of the connectors are not deformed or damaged.

      OK

      The terminals are not deformed or damaged.

    6. Check that the short springs of the activation prevention mechanism of the No. 2 floor wire connector are not deformed or damaged.

      OK

      The short springs are not deformed or damaged.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE NO. 2 FLOOR WIRE 

    Result: 

    OK 

    See step  2

  2. CHECK FRONT SEAT AIRBAG ASSEMBLY RH 
    1. Connect the connector to the airbag sensor assembly.
      GTY773658Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *A w/ Power Seat
      *B w/o Power Seat
      *1 Front Seat Airbag Assembly RH
      *2 Airbag Sensor Assembly
      *3 SST
      *a Front view of wire harness connector
      (to Front Seat Airbag Assembly RH)
    2. Connect the red wire side of SST (resistance: 2.1 Ω) to connector C.
      WARNING:

      Never connect the tester to the front seat airbag assembly RH 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 
    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 [08/2017 - 08/2019]

    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 [08/2017 - 08/2019]

      Result

      Result Proceed to
      DTC B1820, B1821, B1822 or B1823 is not output. A
      DTC B1820, B1821, B1822 or B1823 is output. B

      HINT: 

      Codes other than DTC B1820, B1821, B1822 and B1823 may be output at this time, but they are not related to this check.

    9. Turn the ignition switch off.
    10. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
    11. Disconnect SST from connector C.

    Result: 

    A 

    REPLACE FRONT SEAT AIRBAG ASSEMBLY RH 

    for Manual Seat Type:

    Refer to REMOVAL [08/2017 - 08/2019]

    for Power Seat Type:

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

    Result: 

    B 

    See step  3

  3. CHECK NO. 2 FLOOR WIRE 
    1. Disconnect the No. 2 floor wire from the airbag sensor assembly.
      GTY762278Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *A w/ Power Seat
      *B w/o Power Seat
      *1 Front Seat Airbag Assembly RH
      *2 Airbag Sensor Assembly
      *3 No. 2 Floor Wire
      *a Front view of wire harness connector
      (to Front Seat Airbag Assembly RH)
      Release the activation prevention mechanism
    2. Check for a short to B+ in the circuit.
      1. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
      2. Turn the ignition switch to ON.
      3. Measure the voltage according to the value(s) in the table below.

        Standard Voltage

        W/ POWER SEAT

        Tester Connection Switch Condition Specified Condition
        P5-1 (SFR+) - Body ground Ignition switch ON Below 1 V
        P5-2 (SFR-) - Body ground Ignition switch ON Below 1 V
        W/O POWER SEAT

        Tester Connection Switch Condition Specified Condition
        P16-1 (SFR+) - Body ground Ignition switch ON Below 1 V
        P16-2 (SFR-) - 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.
    3. Check for an open in the circuit.
      1. Measure the resistance according to the value(s) in the table below.

        Standard Resistance

        W/ POWER SEAT

        Tester Connection Condition Specified Condition
        P5-1 (SFR+) - P5-2 (SFR-) Always Below 1 Ω
        W/O POWER SEAT

        Tester Connection Condition Specified Condition
        P16-1 (SFR+) - P16-2 (SFR-) Always Below 1 Ω
    4. Check for a short to ground in the circuit.
      1. Measure the resistance according to the value(s) in the table below.

        Standard Resistance

        W/ POWER SEAT

        Tester Connection Condition Specified Condition
        P5-1 (SFR+) - Body ground Always 1 MΩ or higher
        P5-2 (SFR-) - Body ground Always 1 MΩ or higher
        W/O POWER SEAT

        Tester Connection Condition Specified Condition
        P16-1 (SFR+) - Body ground Always 1 MΩ or higher
        P16-2 (SFR-) - Body ground Always 1 MΩ or higher
    5. Check for a short in the circuit.

      Refer to SYSTEM DESCRIPTION [08/2017 - ]

      1. Release the activation prevention mechanism built into connector B.
      2. Measure the resistance according to the value(s) in the table below.

        Standard Resistance

        W/ POWER SEAT

        Tester Connection Condition Specified Condition
        P5-1 (SFR+) - P5-2 (SFR-) Always 1 MΩ or higher
        W/O POWER SEAT

        Tester Connection Condition Specified Condition
        P16-1 (SFR+) - P16-2 (SFR-) Always 1 MΩ or higher
      3. Restore the released activation prevention mechanism of connector B to the original condition.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE NO. 2 FLOOR WIRE 

    Result: 

    OK 

    See step  4

  4. CHECK DTC 
    1. Connect the connectors to the front seat airbag assembly RH and airbag sensor assembly.
      GTY774578Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Front Seat Airbag Assembly RH
      *2 Airbag Sensor Assembly
    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 [08/2017 - 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 [08/2017 - 08/2019]

      Result

      Result Proceed to
      DTC B1820, B1821, B1822 or B1823 is not output. A
      DTC B1820, B1821, B1822 or B1823 is output. B

      HINT: 

      Codes other than DTC B1820, B1821, B1822 and B1823 may be output at this time, but they are not related to this check.

    Result: 

    A 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [08/2017 - 08/2018]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [08/2018 - 08/2019] 

    Result: 

    B 

    REPLACE AIRBAG SENSOR ASSEMBLY. Refer to  REMOVAL [08/2017 - 08/2019] 

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