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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 B1805: Short in Front Passenger Squib Circuit; DTC B1806: Open in Front Passenger Squib Circuit; DTC B1807: Short to GND in Front Passenger Side Squib Circuit; DTC B1808: Short to B+ in Front Passenger Side Squib Circuit [08/2017 - 08/2019] >> Procedure

DTC B1805: Short in Front Passenger Squib Circuit; DTC B1806: Open in Front Passenger Squib Circuit; DTC B1807: Short to GND in Front Passenger Side Squib Circuit; DTC B1808: Short to B+ in Front Passenger Side Squib Circuit [08/2017 - 08/2019]: Procedure

  1. CHECK CONNECTORS 
    1. Turn the ignition switch off.
      GTY763688Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Instrument Panel Passenger without Door Airbag Assembly
      *2 Airbag Sensor Assembly
      *3 No. 2 Instrument Panel Wire
      *4 Instrument Panel 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 instrument panel passenger without door airbag assembly and airbag sensor assembly. Also check that the connectors that link the instrument panel wire and No. 2 instrument panel wire are properly connected.

      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 instrument panel passenger without door airbag assembly and airbag sensor assembly. Also disconnect the instrument panel wire from the No. 2 instrument panel wire.
    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 No. 2 instrument panel wire connector (on the instrument panel passenger without door airbag assembly side) is not loose, deformed or damaged.

      OK

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

    7. Check that the short springs of the activation prevention mechanisms of the instrument panel wire connector and No. 2 instrument panel wire connector are not deformed or damaged.

      OK

      The short springs are not deformed or damaged.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE INSTRUMENT PANEL WIRE OR NO. 2 INSTRUMENT PANEL WIRE 

    Result: 

    OK 

    See step  2

  2. CHECK INSTRUMENT PANEL PASSENGER WITHOUT DOOR AIRBAG ASSEMBLY 
    1. Connect the instrument panel wire to the No. 2 instrument panel wire and airbag sensor assembly.
      GTY768561Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Instrument Panel Passenger without Door Airbag Assembly
      *2 Airbag Sensor Assembly
      *3 SST
      *a Front view of wire harness connector
      (to Instrument Panel Passenger without Door Airbag Assembly)
      *b Color: Orange
    2. Connect the white wire side of SST (resistance: 2.1 Ω) to connector E (orange connector).
      WARNING:

      Never connect the tester to the instrument panel passenger without door airbag assembly 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 B1805, B1806, B1807 or B1808 is not output A
      DTC B1805, B1806, B1807 or B1808 is output B

      HINT: 

      Codes other than DTC B1805, B1806, B1807 and B1808 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 E.

    Result: 

    A 

    REPLACE INSTRUMENT PANEL PASSENGER WITHOUT DOOR AIRBAG ASSEMBLY. Refer to  REMOVAL [08/2015 - 08/2019] 

    Result: 

    B 

    See step  3

  3. CHECK FRONT PASSENGER SIDE SQUIB CIRCUIT 
    1. Disconnect the instrument panel wire from the airbag sensor assembly.
      GTY761611Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Instrument Panel Passenger without Door Airbag Assembly
      *2 Airbag Sensor Assembly
      *a Front view of wire harness connector
      (to Instrument Panel Passenger without Door Airbag Assembly)
      *b Color: Orange
      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

        Tester Connection Switch Condition Specified Condition
        z10-1 (P+) - Body ground Ignition switch ON Below 1 V
        z10-2 (P-) - 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

        Tester Connection Condition Specified Condition
        z10-1 (P+) - z10-2 (P-) 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

        Tester Connection Condition Specified Condition
        z10-1 (P+) - Body ground Always 1 MΩ or higher
        z10-2 (P-) - Body ground Always 1 MΩ or higher
    5. Check for a short in the circuit.
      1. Release the activation prevention mechanism built into connector B.

        Refer to SYSTEM DESCRIPTION [08/2017 - ]

      2. Measure the resistance according to the value(s) in the table below.

        Standard Resistance

        Tester Connection Condition Specified Condition
        z10-1 (P+) - z10-2 (P-) 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 

    See step  5

    Result: 

    OK 

    See step  4

  4. CHECK DTC 
    1. Connect the connectors to the instrument panel passenger without door airbag assembly and airbag sensor assembly.
      GTY767321Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Instrument Panel Passenger without Door Airbag Assembly
      *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 B1805, B1806, B1807 or B1808 is not output A
      DTC B1805, B1806, B1807 or B1808 is output B

      HINT: 

      Codes other than DTC B1805, B1806, B1807 and B1808 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]

    HOW TO PROCEED WITH TROUBLESHOOTING [08/2018 - 08/2019]

    Result: 

    B 

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

  5. CHECK INSTRUMENT PANEL WIRE 
    1. Disconnect the No. 2 instrument panel wire from the instrument panel wire.
      GTY765459Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Instrument Panel Passenger without Door Airbag Assembly
      *2 Airbag Sensor Assembly
      *3 No. 2 Instrument Panel Wire
      *4 Instrument Panel Wire
      *a Front view of wire harness connector
      (to No. 2 Instrument Panel Wire)
      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

        Tester Connection Switch Condition Specified Condition
        Hz1-1 (P+) - Body ground Ignition switch ON Below 1 V
        Hz1-2 (P-) - 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

        Tester Connection Condition Specified Condition
        Hz1-1 (P+) - Hz1-2 (P-) 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

        Tester Connection Condition Specified Condition
        Hz1-1 (P+) - Body ground Always 1 MΩ or higher
        Hz1-2 (P-) - Body ground Always 1 MΩ or higher
    5. Check for a short in the circuit.
      1. Release the activation prevention mechanism built into connector B.

        Refer to SYSTEM DESCRIPTION [08/2017 - ]

      2. Measure the resistance according to the value(s) in the table below.

        Standard Resistance

        Tester Connection Condition Specified Condition
        Hz1-1 (P+) - Hz1-2 (P-) 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: 

    OK 

    REPLACE NO. 2 INSTRUMENT PANEL WIRE 

    Result: 

    NG 

    REPLACE INSTRUMENT PANEL WIRE 

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