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Home >> Lexus >> 2013 >> RX 350 Base, FWD >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Airbag System (Diagnostic Codes (B1815/54 - B1928/78) & Symptom Tests) >> Airbag System >> DTC B1905/74: Short in Front Pretensioner Squib LH Circuit; DTC B1906/74: Open in Front Pretensioner Squib LH Circuit; DTC B1907/74: Short to GND in Front Pretensioner Squib LH Circuit; DTC B1908/74: Short to B+ in Front Pretensioner Squib LH Circuit (03/2012 - 07/2012) >> Procedure

DTC B1905/74: Short in Front Pretensioner Squib LH Circuit; DTC B1906/74: Open in Front Pretensioner Squib LH Circuit; DTC B1907/74: Short to GND in Front Pretensioner Squib LH Circuit; DTC B1908/74: Short to B+ in Front Pretensioner Squib LH Circuit (03/2012 - 07/2012): Procedure

  1. CHECK CONNECTORS 
    1. Turn the engine switch off.
      GTY270542Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the cable from the negative (-) battery terminal.
      NOTE:

      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 outer belt assembly LH and center airbag sensor assembly.

      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 outer belt assembly LH and center 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 LH side) is not damaged.

      OK

      The lock 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.

      TEXT IN ILLUSTRATION

      *1 Front Pretensioner Squib LH
      *2 Center Airbag Sensor Assembly
      *3 No. 2 Floor Wire

    NG → REPLACE NO. 2 FLOOR WIRE 

    OK: Go to next step 

  2. CHECK FRONT SEAT OUTER BELT ASSEMBLY LH (FRONT PRETENSIONER SQUIB LH) 
    1. Connect the connector to the center airbag sensor assembly.
      GTY276366Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Connect SST (resistance 2.1 Ω) to connector C.
      WARNING:

      Never connect the tester to the front seat outer belt assembly LH (front pretensioner 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.
      • Insert SST straight into the terminals of the connector.
      • SST: 09843-18061 
    3. Connect the cable to the negative (-) battery terminal.
    4. Turn the engine switch on (IG), and wait for at least 60 seconds.
    5. Clear the DTCs stored in the memory. Refer to DTC CHECK / CLEAR [03/2012 - ] .
    6. Turn the engine switch off.
    7. Turn the engine switch on (IG), and wait for at least 60 seconds.
    8. Check for DTCs. Refer to DTC CHECK / CLEAR [03/2012 - ] .

      OK

      DTC B1905, B1906, B1907, B1908 or 74 is not output.

      TEXT IN ILLUSTRATION

      *1 Front Pretensioner Squib LH
      *2 Center Airbag Sensor Assembly
      *3 Front view of wire harness connector
      (to Front Seat Outer Belt Assembly LH)
      *4 Connector C

      HINT: 

      Codes other than DTC B1905, B1906, B1907, B1908 and 74 may be output at this time, but they are not related to this check.

    NG → See step   3 

    OK → See step   7 

  3. CHECK NO. 2 FLOOR WIRE (FRONT PRETENSIONER SQUIB LH CIRCUIT) 
    1. Turn the engine switch off.
      GTY259419Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the cable from the negative (-) battery terminal.
      NOTE:

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

    3. Disconnect SST from connector C.
    4. Disconnect the No. 2 floor wire from the center airbag sensor assembly.
    5. Check for a short to B+ in the circuit.
      1. Connect the cable to the negative (-) battery terminal.
      2. Turn the engine switch on (IG).
      3. Measure the voltage according to the value(s) in the table below.

        Standard Voltage

        Tester Connection Switch Condition Specified Condition
        P5-1 (L+) - Body ground Engine switch on (IG) Below 1 V
        P5-2 (L-) - Body ground Engine switch on (IG) Below 1 V
    6. Check for an open in the circuit.
      1. Turn the engine switch off.
      2. Disconnect the cable from the negative (-) battery terminal.
        NOTE:

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

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

        Standard Resistance

        Tester Connection Condition Specified Condition
        P5-1 (L+) - P5-2 (L-) Always Below 1 Ω
    7. 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
        P5-1 (L+) - Body ground Always 1 MΩ or higher
        P5-2 (L-) - Body ground Always 1 MΩ or higher
    8. Check for a short in the circuit.
      1. Release the activation prevention mechanism built into connector B. Refer to DIAGNOSIS SYSTEM [03/2012 - ] .
      2. Measure the resistance according to the value(s) in the table below.

        Standard Resistance

        Tester Connection Condition Specified Condition
        P5-1 (L+) - P5-2 (L-) Always 1 MΩ or higher
        TEXT IN ILLUSTRATION

        *1 Front Pretensioner Squib LH
        *2 Center Airbag Sensor Assembly
        *3 No. 2 Floor Wire
        *4 Front view of wire harness connector
        (to Front Seat Outer Belt Assembly LH)
        *5 Connector C

    NG → REPLACE NO. 2 FLOOR WIRE 

    OK: Go to next step 

  4. CHECK CENTER AIRBAG SENSOR ASSEMBLY 
    1. Restore the released activation prevention mechanism of connector B to the original condition.
      GTY265452Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Connect the connectors to the front seat outer belt assembly LH and center airbag sensor assembly.
    3. Connect the cable to the negative (-) battery terminal.
    4. Turn the engine switch on (IG), and wait for at least 60 seconds.
    5. Clear the DTCs stored in the memory. Refer to DTC CHECK / CLEAR [03/2012 - ] .
    6. Turn the engine switch off.
    7. Turn the engine switch on (IG), and wait for at least 60 seconds.
    8. Check for DTCs. Refer to DTC CHECK / CLEAR [03/2012 - ] .

      OK

      DTC B1905, B1906, B1907, B1908 or 74 is not output.

      TEXT IN ILLUSTRATION

      *1 Front Pretensioner Squib LH
      *2 Center Airbag Sensor Assembly

      HINT: 

      Codes other than DTC B1905, B1906, B1907, B1908 and 74 may be output at this time, but they are not related to this check.

    NG → See step   6 

    OK → See step   5 

  5. USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [03/2012 - 07/2012] 
  6. REPLACE CENTER AIRBAG SENSOR ASSEMBLY. Refer to  REMOVAL [03/2012 - 07/2012] 
  7. REPLACE FRONT SEAT OUTER BELT ASSEMBLY LH. Refer to  REMOVAL [03/2012 - 07/2012] 
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