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Home >> Toyota >> 2021 >> 4Runner Limited, AWD >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Airbag System - Diagnostic Codes (B1690-B1905) & Symptom Tests >> Airbag System >> DTC B1805-52: Short in Front Passenger Side Squib Circuit; DTC B1806-52: Open in Front Passenger Side Squib Circuit; DTC B1807-52: Short to GND in Front Passenger Side Squib Circuit; DTC B1808-52: Short to B+ in Front Passenger Side Squib Circuit [08/2015 - 08/2019] >> Procedure

DTC B1805-52: Short in Front Passenger Side Squib Circuit; DTC B1806-52: Open in Front Passenger Side Squib Circuit; DTC B1807-52: Short to GND in Front Passenger Side Squib Circuit; DTC B1808-52: Short to B+ in Front Passenger Side Squib Circuit [08/2015 - 08/2019]: Procedure

  1. CHECK INSTRUMENT PANEL PASSENGER AIRBAG ASSEMBLY (FRONT PASSENGER SIDE SQUIB) 
    1. Turn the ignition switch off.
      GTY730859Courtesy 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 (orange connector).
      WARNING:

      Never connect the tester to the instrument panel passenger airbag (front passenger side squib) 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 ignition switch to ON, and wait for at least 60 seconds.
    7. Clear the DTCs (Refer to DTC CHECK / CLEAR [08/2015 - 08/2019] ).
    8. Turn the ignition switch off.
    9. Turn the ignition switch to ON, and wait for at least 60 seconds.
    10. Check for DTCs (Refer to DTC CHECK / CLEAR [08/2015 - 08/2019] ).

      OK

      DTC B1805, B1806, B1807 or B1808 is not output.

      HINT: 

      Codes other than DTC B1805, B1806, B1807 and B1808 may be output at this time, but they are not related to this check.

      TEXT IN ILLUSTRATION

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

    Result: 

    OK 

    REPLACE INSTRUMENT PANEL PASSENGER AIRBAG ASSEMBLY 

    (Refer to REMOVAL [08/2015 - ] )

    Result: 

    NG 

    See step  2

  2. 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 No. 2 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 deformed or damaged.

      GTY676870Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *1 Front Passenger Side Squib
      *2 Center Airbag Sensor

    Result: 

    NG 

    REPLACE NO. 2 INSTRUMENT PANEL WIRE 

    Result: 

    OK 

    See step  3

  3. CHECK FRONT PASSENGER SIDE SQUIB CIRCUIT 
    1. Disconnect the connectors from the center airbag sensor.
      GTY702957Courtesy 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
      F1-2 (P+) - Body ground Ignition switch ON Below 1 V
      F1-1 (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.
    6. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      F1-2 (P+) - F1-1 (P-) 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
      F1-2 (P+) - F1-1 (P-) Always 1 MΩ or higher
      F1-2 (P+) - Body ground Always 1 MΩ or higher
      F1-1 (P-) - Body ground Always 1 MΩ or higher
      TEXT IN ILLUSTRATION

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

    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 ignition switch to ON, and wait for at least 60 seconds.
    4. Clear the DTCs (Refer to DTC CHECK / CLEAR [08/2015 - 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 [08/2015 - 08/2019] ).

      OK

      DTC B1805, B1806, B1807 or B1808 is not output.

      HINT: 

      Codes other than DTC B1805, B1806, B1807 and B1808 may be output at this time, but they are not related to this check.

      TEXT IN ILLUSTRATION

      *1 Front Passenger Side Squib
      *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.
      GTY701521Courtesy 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
      Fz1-1 (P+) - Body ground Ignition switch ON Below 1 V
      Fz1-2 (P-) - Body ground Ignition switch ON Below 1 V
    5. Turn the ignition 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
      Fz1-1 (P+) - Fz1-2 (P-) 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
      Fz1-1 (P+) - Fz1-2 (P-) Always 1 MΩ or higher
      Fz1-1 (P+) - Body ground Always 1 MΩ or higher
      Fz1-2 (P-) - Body ground Always 1 MΩ or higher
      TEXT IN ILLUSTRATION

      *1 Front Passenger Side Squib
      *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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