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Home >> Toyota >> 2008 >> FJ Cruiser RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 194 (Supplemental Restraint System) >> Airbag System >> DTC B1620/21 Driver Side - Side Airbag Sensor Circuit Malfunction >> Inspection Procedure

Inspection Procedure

WARNING: This page is about a different car, the 2008 Toyota Yaris. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: In order to prevent unexpected airbag deployment, disconnect the following connectors before inspecting parts such as wire harnesses, if the application of tester probes to the center airbag sensor assembly connector is necessary.
  1. Turn the ignition switch to the lock position.
  2. Disconnect the negative (-) terminal cable from the battery and wait for at least 90 seconds.
  3. Disconnect the connector from the center airbag sensor assembly.
  4. Disconnect the connectors from the steering pad.
  5. Disconnect the connectors from the front passenger airbag assembly.
  6. Disconnect the connector from the front seat outer belt assembly LH.
  7. Disconnect the connector from the front seat outer belt assembly RH.

    HINT:

    Skip the following steps if side and curtain shield airbags are not fitted.

  8. Disconnect the connector from the front seat side airbag assembly LH.
  9. Disconnect the connector from the front seat side airbag assembly RH.
  10. Disconnect the connector from the curtain shield airbag assembly LH.
  11. Disconnect the connector from the curtain shield airbag assembly RH.
  1. CHECK DTC 
    1. Turn the ignition switch on and wait for at least 60 seconds.
    2. Clear the DTCs stored in the memory (See DTC CHECK / CLEAR  ).
    3. Turn the ignition switch off.
    4. Turn the ignition switch on and wait for at least 60 seconds.
    5. Check the DTCs (See DTC CHECK / CLEAR  ).

      OK: 

      DTC B1620/21 is not output. 

      HINT:

      DTCs other than DTC B1620/21 may be output at this time, but they are not related to this check.

      6. Fig 1: Checking DTC
      G04830006Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: USE SIMULATION METHOD TO CHECK 

    NG: GO TO NEXT STEP 

  2. CHECK CONNECTION OF CONNECTORS 
    1. Turn the ignition switch off.
    2. Disconnect the negative (-) terminal cable from the battery and wait for at least 90 seconds.
    3. Check that the connectors are properly connected to the center airbag sensor assembly, rear airbag sensor LH and the side airbag sensor LH.

      OK: 

      The connectors are properly connected. 

    NG: CONNECT CONNECTORS 

    OK: GO TO NEXT STEP 

  3. CHECK FLOOR WIRE (FOR OPEN) 
    1. Disconnect the connectors from the center airbag sensor assembly and the side airbag sensor LH.
    2. Using a service wire, connect J17-4 (BBL+) and J17-3 (BBL-) of connector C.
      NOTE: Do not forcibly insert the service wire into the terminals of the connector when connecting.
    3. Measure the resistance.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      J8-8 (BBD+) - J8-15 (BBD-) Always Below 1 Ω
      4. Fig 2: Checking Floor Wire (For Open)
      G04830007Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE FLOOR WIRE 

    OK: GO TO NEXT STEP 

  4. CHECK FLOOR WIRE (FOR SHORT) 
    1. Disconnect the service wire from connector C.
    2. Measure the resistance.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      J8-8 (BBD+) - J8-15 (BBD-) Always 1 MΩ or Higher
      3. Fig 3: Checking Floor Wire (For Short)
      G04830008Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE FLOOR WIRE 

    OK: GO TO NEXT STEP 

  5. CHECK FLOOR WIRE (TO B+) 
    1. Connect the negative (-) terminal cable to the battery and wait for at least 2 seconds.
    2. Turn the ignition switch to the on position.
    3. Measure the voltage.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      J8-8 (BBD+) - Body ground Ignition switch on Below 1 V
      J8-15 (BBD-) - Body ground Ignition switch on Below 1 V
      4. Fig 4: Checking Floor Wire (For Short)
      G04830008Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE FLOOR WIRE 

    OK: GO TO NEXT STEP 

  6. CHECK FLOOR WIRE (TO GROUND) 
    1. Turn the ignition switch to the lock position.
    2. Disconnect the negative (-) terminal cable from the battery and wait for at least 90 seconds.
    3. Measure the resistance.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      J8-8 (BBD+) - Body ground Always 1 MΩ or Higher
      J8-15 (BBD-) - Body ground Always 1 MΩ or Higher
      4. Fig 5: Checking Floor Wire (For Short)
      G04830008Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE FLOOR WIRE 

    OK: GO TO NEXT STEP 

  7. CHECK SIDE AIRBAG SENSOR LH 
    1. Connect the connectors to the center airbag sensor assembly.
    2. Interchange the side airbag sensor RH with the side airbag sensor LH and connect the connectors to them.
    3. Connect the negative (-) terminal cable to the battery and wait for at least 2 seconds.
    4. Turn the ignition switch to the on position and wait for at least 60 seconds.
    5. Clear the DTCs stored in the memory (See DTC CHECK / CLEAR  ).
    6. Turn the ignition switch to the lock position.
    7. Turn the ignition switch to the on position and wait for at least 60 seconds.
    8. Check for DTCs (See DTC CHECK / CLEAR  ).

      Result 

      RESULT CHART

      Result Proceed to
      DTC B1620/21 is output. A
      DTC B1625/22 is output. B
      Neither DTC B1620/21 nor B1625/22 is output. C
      9. Fig 6: Checking Side Airbag Sensor LH
      G04830011Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    A: Go to step 8 

    B: REPLACE SIDE AIRBAG SENSOR LH 

    C: USE SIMULATION METHOD TO CHECK 

  8. CHECK FLOOR WIRE (FOR OPEN) 
    1. Disconnect the connectors from the side airbag sensor LH and the rear airbag sensor LH.
    2. Using a service wire, connect J15-1 (BCL-) and J15-2 (BCL+) of connector C.
      NOTE: Do not forcibly insert the service wire into the terminals of the connector when connecting.
    3. Measure the resistance.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      J17-1 (BCL+) - J17-2 (BCL-) Always Below 1 Ω
      4. Fig 7: Checking Side Airbag Sensor LH
      G04830012Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE FLOOR WIRE 

    OK: GO TO NEXT STEP 

  9. CHECK FLOOR WIRE (FOR SHORT) 
    1. Disconnect the service wire from connector C.
    2. Measure the resistance.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      J17-1 (BCL+)-J17-2 (BCL-) Always 1 MΩ or Higher
      3. Fig 8: Checking Floor Wire (For Short)
      G04830013Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE FLOOR WIRE 

    OK: GO TO NEXT STEP 

  10. CHECK FLOOR WIRE (TO B+) 
    1. Connect the negative (-) terminal cable to the battery and wait for at least 2 seconds.
    2. Turn the ignition switch to the on position.
    3. Measure the voltage.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      J17-1 (BCL+) - Body ground Ignition switch on Below 1 V
      J17-2 (BCL-) - Body ground Ignition switch on Below 1V
      4. Fig 9: Checking Floor Wire (For Short)
      G04830013Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE FLOOR WIRE 

    OK: GO TO NEXT STEP 

  11. CHECK FLOOR WIRE (TO GROUND) 
    1. Turn the ignition switch to the lock position.
    2. Disconnect the negative (-) terminal cable from the battery and wait for at least 90 seconds.
    3. Measure the resistance.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      J17-1 (BCL+) - Body ground Always 1 MΩ or Higher
      J17-2 (BCL-) - Body ground Always 1 MΩ or Higher
      4. Fig 10: Checking Floor Wire (For Short)
      G04830013Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE FLOOR WIRE 

    OK: GO TO NEXT STEP 

  12. CHECK REAR AIRBAG SENSOR LH 
    1. Connect the connectors to the center airbag sensor assembly.
    2. Interchange the airbag sensor rear LH with the airbag sensor rear RH and connect the connectors to them.
    3. Connect the negative (-) terminal cable to the battery and wait for at least 2 seconds.
    4. Turn the ignition switch to the on position and wait for at least 60 seconds.
    5. Clear the DTCs stored in the memory (See DTC CHECK / CLEAR  ).
    6. Turn the ignition switch to the lock position.
    7. Turn the ignition switch to the on position and wait for at least 60 seconds.
    8. Check for DTCs (See DTC CHECK / CLEAR  ).

      Result 

      RESULT CHART

      Result Proceed to
      DTC B1620/21 is output. A
      DTC B1625/22 is output. B
      Neither DTC B1620/21 nor B1625/22 is output. C
      Fig 11: Checking Rear Airbag Sensor LH
      G04830016Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT:

      DTCs other than B1620/21 and B1625/22 may be output at this time, but they are not related to this check.

    A: REPLACE CENTER AIRBAG SENSOR ASSEMBLY 

    B: REPLACE REAR AIRBAG SENSOR LH 

    C: USE SIMULATION METHOD TO CHECK 

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