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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 B1900-73: Short in Front Pretensioner Squib RH Circuit [06/2015 - ] >> Procedure

DTC B1900-73: Short in Front Pretensioner Squib RH Circuit [06/2015 - ]: Procedure

  1. CHECK CONNECTORS 
    1. Turn the power switch off.
      GTY425806Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Front Seat Outer Belt Assembly RH
      *2 Airbag Sensor Assembly
      *3 No. 2 Floor 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 front seat outer belt 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 outer belt assembly RH 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 No. 2 floor wire connector (on the front seat outer belt assembly RH 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 No. 2 floor 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 NO. 2 FLOOR WIRE 

    Result: 

    OK 

    See step  2

  2. CHECK NO. 2 FLOOR WIRE 
    1. Check for a short in the circuit.
      GTY581170Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Front Seat Outer Belt Assembly RH
      *2 Airbag Sensor Assembly
      *3 No. 2 Floor Wire
      *a Front view of wire harness connector
      (to Front Seat Outer Belt Assembly RH)
      1. Release the activation prevention mechanism built into connector B.

        Refer to DIAGNOSIS SYSTEM [06/2015 - ]

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

        Standard Resistance

        Tester Connection Condition Specified Condition
        Q4-1 (R+) - Q4-2 (R-) 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  3

  3. CHECK DTC 
    1. Connect the connectors to the airbag sensor assembly.
      GTY552865Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Front Seat Outer Belt Assembly RH
      *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 B1900/73 is not output.

      HINT: 

      Codes other than DTC B1900/73 may be output at this time, but they are not related to this check.

      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. Turn the power switch off.
      GTY575526Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Front Seat Outer Belt Assembly RH
      *2 Airbag Sensor Assembly
    2. Disconnect the cable from the negative (-) auxiliary battery terminal and wait for at least 90 seconds.
    3. Connect the connectors to the front seat outer belt assembly RH.
    4. Connect the cable to the negative (-) auxiliary battery terminal.
    5. Turn the power switch on (IG), and wait for at least 60 seconds.
    6. Clear the DTCs stored in memory.

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

      Body Electrical > SRS Airbag > Clear DTCs 

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

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

      Body Electrical > SRS Airbag > Trouble Codes 

      OK

      DTC B1900/73 is not output.

      HINT: 

      Codes other than DTC B1900/73 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 FRONT SEAT OUTER BELT ASSEMBLY RH. Refer to  REMOVAL [06/2015 - 11/2018]  , or refer to  REMOVAL [11/2018 - ] 

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