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Home >> Scion >> 2014 >> FR-S Standard Trans >> Repair and Diagnosis (Single Page) >> Restraints >> Air Bag, SRS >> Supplemental Restraint System (Diagnostic Codes & Symptom Tests) >> Airbag System >> DTC B1825: Short in Side Squib (LH) Circuit; DTC B1826: Open in Side Squib (LH) Circuit; DTC B1827: Short in Side Squib (LH) Circuit (to Ground); DTC B1828: Short in Side Squib (LH) Circuit (to +B) >> Procedure

DTC B1825: Short in Side Squib (LH) Circuit; DTC B1826: Open in Side Squib (LH) Circuit; DTC B1827: Short in Side Squib (LH) Circuit (to Ground); DTC B1828: Short in Side Squib (LH) Circuit (to +B): Procedure

  1. CHECK CONNECTORS 
    1. Turn the ignition switch off.
      GTY392940Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the cable from the negative (-) battery terminal.
      WARNING:

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

    3. Check that the connectors are properly connected to the front seat airbag assembly LH and airbag ECU assembly. Also check that the connectors that link the floor wire and front seat wire LH are properly connected.

      OK

      The connectors are properly connected.

      HINT: 

      If the connectors are not connected securely, reconnect the connectors and proceed to the next inspection.

    4. Disconnect the connectors from the front seat airbag assembly LH and airbag ECU assembly. Also disconnect the floor wire from the front seat wire LH.
    5. Check that the terminals of the connectors are not damaged.

      OK

      The terminals are not deformed or damaged.

    6. Check that the front seat wire LH connector (on the front seat airbag assembly LH side) is not damaged.

      OK

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

    7. Check that the short springs for the floor wire and the front seat wire LH with the activation prevention mechanism are not deformed or damaged.

      OK

      The short springs are not deformed or damaged.

      TEXT IN ILLUSTRATION

      *1 Front Seat Airbag Assembly LH
      *2 Airbag ECU Assembly
      *3 Front Seat Wire LH
      *4 Floor Wire

    NG → REPLACE WIRE HARNESS 

    OK: Go to next step 

  2. CHECK FRONT SEAT AIRBAG ASSEMBLY LH (FRONT SIDE SQUIB LH) 
    1. Connect the floor wire to the front seat wire LH and airbag ECU assembly.
      GTY391613Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Connect SST (resistance 2.1 Ω) to connector E.
      WARNING:

      Never connect the tester to the front seat airbag assembly LH (front side squib LH) 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 (-) battery terminal.
    4. Clear the DTCs stored in memory. Refer to DTC CHECK / CLEAR [07/2013 - ] .
    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 [07/2013 - ] .

      OK

      DTC B1825, B1826, B1827 or B1828 is not output.

      HINT: 

      Codes other than DTCs B1825, B1826, B1827 and B1828 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 (-) battery terminal.
      WARNING:

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

    10. Disconnect SST from connector E.
      TEXT IN ILLUSTRATION

      *1 Front Seat Airbag Assembly LH
      *2 Airbag ECU Assembly
      *a Front view of wire harness connector
      (to Front Seat Airbag Assembly LH)

    NG → See step   3 

    OK → See step   9 

  3. CHECK FLOOR WIRE 
    1. Disconnect the floor wire from the airbag ECU assembly.
      GTY390780Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check for a short to B+ in the circuit.
      1. Connect the cable to the negative (-) battery terminal.
      2. Turn the ignition switch to ON.
      3. Measure the voltage according to the value(s) in the table below.

        Standard Voltage

        Tester Connection Condition Specified Condition
        b1-1 (SFL-) - Body ground Ignition switch ON Below 1 V
        b1-2 (SFL+) - Body ground Ignition switch ON Below 1 V
      4. Turn the ignition switch off.
      5. Disconnect the cable from the negative (-) battery terminal.
        WARNING:

        Wait at least 90 seconds after disconnecting the cable from the negative (-) 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
        b1-1 (SFL-) - b1-2 (SFL+) 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
        b1-1 (SFL-) - Body ground Always 1 MΩ or higher
        b1-2 (SFL+) - 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 [07/2013 - ] .
      2. Measure the resistance according to the value(s) in the table below.

        Standard Resistance

        Tester Connection Condition Specified Condition
        b1-1 (SFL-) - b1-2 (SFL+) Always 1 MΩ or higher
      3. Restore the released activation prevention mechanism of connector B to the original condition.
        TEXT IN ILLUSTRATION

        *1 Front Seat Airbag Assembly LH
        *2 Airbag ECU Assembly
        *a Front view of wire harness connector
        (to Front Seat Airbag Assembly LH)

    NG → See step   5 

    OK: Go to next step 

  4. CHECK DTC 
    1. Connect the connectors to the front seat airbag assembly LH and airbag ECU assembly.
      GTY388296Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Connect the cable to the negative (-) battery terminal.
    3. Clear the DTCs stored in memory. Refer to DTC CHECK / CLEAR [07/2013 - ] .
    4. Turn the ignition switch off.
    5. Turn the ignition switch to ON, and wait for at least 60 seconds.
    6. Check for DTCs. Refer to DTC CHECK / CLEAR [07/2013 - ] .

      OK

      DTC B1825, B1826, B1827 or B1828 is not output.

      HINT: 

      Codes other than DTCs B1825, B1826, B1827 and B1828 may be output at this time, but they are not related to this check.

      TEXT IN ILLUSTRATION

      *1 Front Seat Airbag Assembly LH
      *2 Airbag ECU Assembly

    NG → See step   8 

    OK → See step   7 

  5. CHECK FLOOR WIRE 
    1. Disconnect the front seat wire LH from the floor wire.
      GTY388288Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check for a short to B+ in the circuit.
      1. Connect the cable to the negative (-) battery terminal.
      2. Turn the ignition switch to ON.
      3. Measure the voltage according to the value(s) in the table below.

        Standard Voltage

        Tester Connection Condition Specified Condition
        Hb1-1 - Body ground Ignition switch ON Below 1 V
        Hb1-2 - Body ground Ignition switch ON Below 1 V
      4. Turn the ignition switch off.
      5. Disconnect the cable from the negative (-) battery terminal.
        WARNING:

        Wait at least 90 seconds after disconnecting the cable from the negative (-) 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
        Hb1-1 - Hb1-2 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
        Hb1-1 - Body ground Always 1 MΩ or higher
        Hb1-2 - 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 [07/2013 - ] .
      2. Measure the resistance according to the value(s) in the table below.

        Standard Resistance

        Tester Connection Condition Specified Condition
        Hb1-1 - Hb1-2 Always 1 MΩ or higher
      3. Restore the released activation prevention mechanism of connector B to the original condition.
      TEXT IN ILLUSTRATION

      *1 Front Seat Airbag Assembly LH
      *2 Airbag ECU Assembly
      *3 Front Seat Wire LH
      *4 Floor Wire
      *a Front view of wire harness connector
      (to Front Seat Wire LH)

    NG → REPLACE FLOOR WIRE 

    OK: Go to next step 

  6. CHECK FRONT SEAT WIRE LH 
    1. Check for a short to B+ in the circuit.
      GTY389296Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Connect the cable to the negative (-) battery terminal.
      2. Turn the ignition switch to ON.
      3. Measure the voltage according to the value(s) in the table below.

        Standard Voltage

        Tester Connection Condition Specified Condition
        b1-1 (SFL-) - Body ground Ignition switch ON Below 1 V
        b1-2 (SFL+) - Body ground Ignition switch ON Below 1 V
      4. Turn the ignition switch off.
      5. Disconnect the cable from the negative (-) battery terminal.
        WARNING:

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

    2. 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
        b1-1 (SFL-) - b1-2 (SFL+) Always Below 1 Ω
    3. 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
        b1-1 (SFL-) - Body ground Always 1 MΩ or higher
        b1-2 (SFL+) - Body ground Always 1 MΩ or higher
    4. Check for a short in the circuit.
      1. Release the activation prevention mechanism built into connector D. Refer to DIAGNOSIS SYSTEM [07/2013 - ] .
      2. Measure the resistance according to the value(s) in the table below.

        Standard Resistance

        Tester Connection Condition Specified Condition
        b1-1 (SFL-) - b1-2 (SFL+) Always 1 MΩ or higher
      3. Restore the released activation prevention mechanism of connector D to the original condition.
      TEXT IN ILLUSTRATION

      *1 Front Seat Airbag Assembly LH
      *2 Airbag ECU Assembly
      *3 Front Seat Wire LH
      *4 Floor Wire
      *a Front view of wire harness connector
      (to Front Seat Airbag Assembly LH)

    NG → REPLACE FRONT SEAT ASSEMBLY LH 

    OK → See step   7 

  7. USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [07/2013 - 12/2013] 
  8. REPLACE AIRBAG ECU ASSEMBLY. Refer to  REMOVAL [07/2013 - 12/2013] 
  9. REPLACE FRONT SEAT AIRBAG ASSEMBLY LH. Refer to  REMOVAL [07/2013 - ] 
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