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Home >> Toyota >> 2017 >> Prius C One >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Supplemental Restraint System - Diagnostic Codes (3 Of 3) & Symptom Tests >> Airbag System >> DTC B1870/66: Short in Driver Side Front Seat Cushion Squib Circuit; DTC B1871/66: Open in Driver Side Front Seat Cushion Squib Circuit; DTC B1872/66: Short to GND in Driver Side Front Seat Cushion Squib Circuit; DTC B1873/66: Short to B+ in Driver Side Front Seat Cushion Squib Circuit [06/2017 - ] >> Procedure

DTC B1870/66: Short in Driver Side Front Seat Cushion Squib Circuit; DTC B1871/66: Open in Driver Side Front Seat Cushion Squib Circuit; DTC B1872/66: Short to GND in Driver Side Front Seat Cushion Squib Circuit; DTC B1873/66: Short to B+ in Driver Side Front Seat Cushion Squib Circuit [06/2017 - ]: Procedure

  1. CHECK CONNECTORS 
    1. Turn the ignition switch off.
      GTY451104Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Front Seat Airbag Sub-assembly LH
      *2 Airbag Sensor Assembly
      *3 Floor Wire
    2. Disconnect the cable from the negative (-) auxiliary battery terminal.
      WARNING:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

    3. Check that the connectors are properly connected to the front seat airbag sub-assembly LH 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 sub-assembly LH 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 floor wire connector are not deformed or damaged.

      OK

      The short springs are not deformed or damaged.

    Result: 

    NG 

    REPLACE FLOOR WIRE 

    Result: 

    OK 

    See step  2

  2. CHECK FRONT SEAT AIRBAG SUB-ASSEMBLY LH (DRIVER SIDE FRONT SEAT CUSHION SQUIB) 
    1. Connect the connector to the airbag sensor assembly.
      GTY743730Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Front Seat Airbag Sub-assembly LH
      *2 Airbag Sensor Assembly
      *a Front view of wire harness connector
      (to Front Seat Airbag Sub-assembly LH)
    2. Connect SST (resistance 2.1 Ω) to connector C.
      WARNING:

      Never connect the tester to the front seat airbag sub-assembly LH (driver side front seat cushion 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 it.
      • Insert SST straight into the terminals of the connector.
      • SST: 09843-18061 
    3. Connect the cable to the negative (-) auxiliary battery terminal.
    4. Clear the DTCs stored in memory (Refer to DTC CHECK / CLEAR [11/2015 - ] ).
    5. Turn the ignition switch off.
    6. Turn the ignition switch to ON (IG), and wait for at least 60 seconds.
    7. Check for DTCs (Refer to DTC CHECK / CLEAR [11/2015 - ] ).

      OK

      DTC B1870/66, B1871/66, B1872/66 or B1873/66 is not output.

      HINT: 

      Codes other than DTCs B1870/66, B1871/66, B1872/66 and B1873/66 may be output at this time, but they are not related to this check.

    8. Turn the ignition switch off.
    9. Disconnect the cable from the negative (-) auxiliary battery terminal.
      WARNING:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

    10. Disconnect SST from connector C.

    Result: 

    OK 

    REPLACE FRONT SEAT AIRBAG SUB-ASSEMBLY LH 

    Refer to REMOVAL [11/2015 - ] )

    Result: 

    NG 

    See step  3

  3. CHECK FLOOR WIRE 
    1. Disconnect the floor wire from the airbag sensor assembly.
      GTY740780Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Front Seat Airbag Sub-assembly LH
      *2 Airbag Sensor Assembly
      *3 Floor Wire
      *a Front view of wire harness connector
      (to Front Seat Airbag Sub-assembly LH)
    2. Check for a short to B+ in the circuit.
      1. Connect the cable to the negative (-) auxiliary battery terminal.
      2. Turn the ignition switch to ON (IG).
      3. Measure the voltage according to the value(s) in the table below.

        Standard Voltage

        Tester Connection Condition Specified Condition
        M34-2 (FCD+) - Body ground Ignition switch ON (IG) Below 1 V
        M34-1 (FCD-) - Body ground Ignition switch ON (IG) Below 1 V
      4. Turn the ignition switch off.
      5. Disconnect the cable from the negative (-) auxiliary battery terminal.
        WARNING:

        Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

    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
        M34-2 (FCD+) - M34-1 (FCD-) 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
        M34-2 (FCD+) - Body ground Always 1 MΩ or higher
        M34-1 (FCD-) - 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 DIAGNOSIS SYSTEM [06/2017 - ] ).
      2. Measure the resistance according to the value(s) in the table below.

        Standard Resistance

        Tester Connection Condition Specified Condition
        M34-2 (FCD+) - M34-1 (FCD-) Always 1 MΩ or higher
      3. Restore the released activation prevention mechanism of connector B to the original condition.

    Result: 

    NG 

    REPLACE FLOOR WIRE 

    Result: 

    OK 

    See step  4

  4. CHECK DTC 
    1. Connect the connectors to the front seat airbag sub-assembly LH and airbag sensor assembly.
      GTY437079Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Front Seat Airbag Sub-assembly LH
      *2 Airbag Sensor Assembly
    2. Connect the cable to the negative (-) auxiliary battery terminal.
    3. Clear the DTCs stored in memory (Refer to DTC CHECK / CLEAR [11/2015 - ] ).
    4. Turn the ignition switch off.
    5. Turn the ignition switch to ON (IG), and wait for at least 60 seconds.
    6. Check for DTCs (Refer to DTC CHECK / CLEAR [11/2015 - ] ).

      OK

      DTC B1870/66, B1871/66, B1872/66 or B1873/66 is not output.

      HINT: 

      Codes other than DTCs B1870/66, B1871/66, B1872/66 and B1873/66 may be output at this time, but they are not related to this check.

    Result: 

    OK 

    USE SIMULATION METHOD TO CHECK 

    Refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2015 - ] )

    Result: 

    NG 

    REPLACE AIRBAG SENSOR ASSEMBLY 

    Refer to REMOVAL [11/2015 - ] )

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