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Home >> Toyota >> 2017 >> Mirai >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Airbag System - Diagnostic Codes (3 Of 3) & Symptom Tests >> Airbag System >> DTC B1861-64: Open in Driver Side Knee Airbag Squib Circuit [06/2015 - ] >> Procedure

DTC B1861-64: Open in Driver Side Knee Airbag Squib Circuit [06/2015 - ]: Procedure

  1. CHECK CONNECTORS 
    1. Turn the power switch off.
      GTY432234Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Lower No. 1 Instrument Panel Airbag Assembly
      *2 Airbag Sensor Assembly
      *3 Instrument Panel Wire
    2. Disconnect the cable from the negative (-) auxiliary battery terminal and wait for at least 90 seconds.
    3. Check that the connectors are properly connected to the lower No. 1 instrument panel airbag assembly 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 lower No. 1 instrument panel airbag assembly and airbag sensor assembly.
    5. Check that the terminals of the connectors are not damaged.

      OK

      The terminals are not deformed or damaged.

    6. Check that the instrument panel wire connector (on the lower No. 1 instrument panel airbag assembly side) is not 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 spring for the instrument panel wire with the activation prevention mechanism is not deformed or damaged.

      OK

      The short spring is not deformed or damaged.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE INSTRUMENT PANEL WIRE 

    Result: 

    OK 

    See step  2

  2. CHECK INSTRUMENT PANEL WIRE 
    1. Check for an open in the circuit.
      GTY603905Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Lower No. 1 Instrument Panel Airbag Assembly
      *2 Airbag Sensor Assembly
      *3 Instrument Panel Wire
      *a Front view of wire harness connector
      (to Lower No. 1 Instrument Panel Airbag Assembly)
      1. Measure the resistance according to the value(s) in the table below.

        Standard Resistance

        Tester Connection Condition Specified Condition
        G31-1 (DK+) - G31-2 (DK-) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE INSTRUMENT PANEL WIRE 

    Result: 

    OK 

    See step  3

  3. CHECK DTC 
    1. Connect the connectors to the airbag sensor assembly.
      GTY597616Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Lower No. 1 Instrument Panel Airbag Assembly
      *2 Airbag Sensor Assembly
      *a Front view of wire harness connector
      (to Lower No. 1 Instrument Panel Airbag Assembly)
      *b Service Wire
    2. Using a service wire, connect terminals 1 (DK+) and 2 (DK-) of connector C.
      NOTE:

      Do not forcibly insert the service wire into the terminals of the connector when connecting the wire.

    3. Connect the cable to the negative (-) auxiliary battery terminal.
    4. Turn the power switch on (IG), and wait for at least 60 seconds.
    5. Clear the DTCs stored in memory.

      Refer to DTC CHECK / CLEAR [06/2015 - ]

      Body Electrical > SRS Airbag > Clear DTCs 

    6. Turn the power switch off.
    7. Turn the power switch on (IG), and wait for at least 60 seconds.
    8. Check for DTCs.

      Refer to DTC CHECK / CLEAR [06/2015 - ]

      Body Electrical > SRS Airbag > Trouble Codes 

      OK

      DTC B1861/64 is not output.

      HINT: 

      Codes other than DTC B1861/64 may be output at this time, but they are not related to this check.

    9. Turn the power switch off.
    10. Disconnect the cable from the negative (-) auxiliary battery terminal and wait for at least 90 seconds.
    11. Disconnect the service wire from connector C.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE AIRBAG SENSOR ASSEMBLY. Refer to  REMOVAL [06/2015 - 11/2018]  , or refer to  REMOVAL [11/2018 - ] 

    Result: 

    OK 

    See step  4

  4. CHECK DTC 
    1. Connect the connectors to the lower No. 1 instrument panel airbag assembly.
      GTY545104Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Lower No. 1 Instrument Panel Airbag Assembly
      *2 Airbag Sensor Assembly
    2. Connect the cable to the negative (-) auxiliary battery terminal.
    3. Turn the power switch on (IG), and wait for at least 60 seconds.
    4. Clear the DTCs stored in memory.

      Refer to DTC CHECK / CLEAR [06/2015 - ]

      Body Electrical > SRS Airbag > Clear DTCs 

    5. Turn the power switch off.
    6. Turn the power switch on (IG), and wait for at least 60 seconds.
    7. Check for DTCs.

      Refer to DTC CHECK / CLEAR [06/2015 - ]

      Body Electrical > SRS Airbag > Trouble Codes 

      OK

      DTC B1861/64 is not output.

      HINT: 

      Codes other than DTC B1861/64 may be output at this time, but they are not related to this check.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [06/2015 - 11/2018]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2018 - ] 

    Result: 

    NG 

    REPLACE LOWER NO. 1 INSTRUMENT PANEL AIRBAG ASSEMBLY. Refer to  REMOVAL [06/2015 - 11/2018]  , or refer to  REMOVAL [11/2018 - ] 

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