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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 B1860/64: Short in Driver Side Knee Airbag Squib Circuit; DTC B1861/64: Open in Driver Side Knee Airbag Squib Circuit; DTC B1862/64: Short to GND in Driver Side Knee Airbag Squib Circuit; DTC B1863/64: Short to B+ in Driver Side Knee Airbag Squib Circuit (03/2012 - 07/2012) >> Procedure

DTC B1860/64: Short in Driver Side Knee Airbag Squib Circuit; DTC B1861/64: Open in Driver Side Knee Airbag Squib Circuit; DTC B1862/64: Short to GND in Driver Side Knee Airbag Squib Circuit; DTC B1863/64: Short to B+ in Driver Side Knee Airbag Squib Circuit (03/2012 - 07/2012): Procedure

  1. CHECK CONNECTORS 
    1. Turn the engine switch off.
      GTY277722Courtesy 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 driver side knee airbag assembly 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 driver side knee airbag assembly 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 instrument panel wire connector (on the driver side knee airbag assembly 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 instrument panel wire with the activation prevention mechanism are not deformed or damaged.

      OK

      The short spring is not deformed or damaged.

      TEXT IN ILLUSTRATION

      *1 Driver Side Knee Airbag Squib
      *2 Center Airbag Sensor Assembly
      *3 Instrument Panel Wire

    NG → REPLACE INSTRUMENT PANEL WIRE 

    OK: Go to next step 

  2. CHECK DRIVER SIDE KNEE AIRBAG ASSEMBLY (DRIVER SIDE KNEE AIRBAG SQUIB) 
    1. Connect the connector to the center airbag sensor assembly.
      GTY273004Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Connect SST (resistance 2.1 Ω) to connector C.
      WARNING:

      Never connect the tester to the driver side knee airbag assembly (driver side knee airbag 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.
      • 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 B1860, B1861, B1862, B1863 or 64 is not output.

      TEXT IN ILLUSTRATION

      *1 Driver Side Knee Airbag Squib
      *2 Center Airbag Sensor Assembly
      *3 Front view of wire harness connector
      (to Driver Side Knee Airbag Assembly)
      *4 Connector C

      HINT: 

      Codes other than DTC B1860, B1861, B1862, B1863 and 64 may be output at this time, but they are not related to this check.

    NG → See step   3 

    OK → See step   6 

  3. CHECK INSTRUMENT PANEL WIRE (DRIVER SIDE KNEE AIRBAG SQUIB CIRCUIT) 
    1. Turn the engine switch off.
      GTY266476Courtesy 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 instrument panel 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
        F11-1 (DK+) - Body ground Engine switch on (IG) Below 1 V
        F11-2 (DK-) - 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
        F11-1 (DK+) - F11-2 (DK-) 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
        F11-1 (DK+) - Body ground Always 1 MΩ or higher
        F11-2 (DK-) - 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
        F11-1 (DK+) - F11-2 (DK-) Always 1 MΩ or higher
        TEXT IN ILLUSTRATION

        *1 Driver Side Knee Airbag Squib
        *2 Center Airbag Sensor Assembly
        *3 Instrument Panel Wire
        *4 Front view of wire harness connector
        (to Driver Side Knee Airbag Assembly)
        *5 Connector C

    NG → REPLACE INSTRUMENT PANEL 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.
      GTY255539Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Connect the connectors to the driver side knee airbag assembly 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 B1860, B1861, B1862, B1863 or 64 is not output.

      TEXT IN ILLUSTRATION

      *1 Driver Side Knee Airbag Squib
      *2 Center Airbag Sensor Assembly

      HINT: 

      Codes other than DTC B1860, B1861, B1862, B1863 and 64 may be output at this time, but they are not related to this check.

    NG → See step   7 

    OK → See step   5 

  5. USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [03/2012 - 07/2012] 
  6. REPLACE DRIVER SIDE KNEE AIRBAG ASSEMBLY. Refer to  REMOVAL [03/2012 - 07/2012] 
  7. REPLACE CENTER AIRBAG SENSOR ASSEMBLY. Refer to  REMOVAL [03/2012 - 07/2012] 
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