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Home >> Lexus >> 2008 >> SC 430 >> Repair and Diagnosis >> External Pages >> Different car >> Section 35 (Supplemental Restraint System) >> Airbag System >> DTC B1650/32 Occupant Classification System Malfunction >> Inspection Procedure

Inspection Procedure

WARNING: This page is about a different car, the 2007 Lexus SC 430. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK FOR DTC (OCCUPANT CLASSIFICATION ECU) 
    1. Turn the ignition switch ON, and wait for at least 10 seconds.
    2. Using the intelligent tester, check the DTCs of the occupant classification ECU (see DTC CHECK / CLEAR  ).

      OK: 

      DTC is not output. 

    NG: REPAIR CIRCUITS INDICATED BY OUTPUT DTCS 

    OK: Go to next step 

  2. CHECK FOR DTC (CENTER AIRBAG SENSOR) 
    Fig 1: Checking For DTC (Center Airbag Sensor)
    G05292162Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Turn the ignition switch ON, and wait for at least 60 seconds.
    2. Clear the DTCs (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 for DTCs (see DTC CHECK / CLEAR  ).

      OK: 

      DTC B1650/32 is not output. 

      HINT:

      Codes other than DTC B1650/32 may be output at this time, but they are not related to this check.

    OK: USE SIMULATION METHOD TO CHECK 

    NG: Go to next step 

  3. 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 and the occupant classification ECU.

      OK: 

      The connectors are properly connected. 

    NG: CONNECT CONNECTORS PROPERLY 

    OK: Go to next step 

  4. CHECK CONNECTORS 
    1. Disconnect the connectors from the center airbag sensor and the occupant classification ECU,
    2. Check that the connectors (on the center airbag sensor side and occupant classification ECU side) are not damaged.

      OK: 

      The connectors are not deformed or damaged. 

    NG: REPLACE HARNESS AND CONNECTOR 

    OK: Go to next step 

  5. CHECK OCCUPANT CLASSIFICATION SYSTEM CIRCUIT 
    Fig 2: Checking Occupant Classification System Circuit
    G05292163Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Using a service wire, connect terminals 16 (FSR+) and 24 (FSR-) of connector B.
      NOTE: Do not forcibly insert a service wire into the terminals of the connector when connecting the wire.
    2. Measure the resistance of the wire harness side connector.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Specified Condition
      O3-11 (FSR+) - O3-12 (FSR-) Below 1 Ω
    3. Disconnect the service wire from connector B.
    4. Measure the resistance of the wire harness side connector.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Specified Condition
      O3-11 (FSR+) - O3-12 (FSR-) 1 MΩ or higher
      O3-11 (FSR+) - Body ground 1 MΩ or higher
      O3-12 (FSR-) - Body ground 1 MΩ or higher
    5. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
    6. Turn the ignition switch ON.
    7. Measure the voltage of the wire harness side connector.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      O3-11 (FSR+) - Body ground Ignition switch ON Below 1 V
      O3-12 (FSR-) - Body ground Ignition switch ON Below 1 V

    OK: REPLACE CENTER AIRBAG SENSOR ASSEMBLY 

    NG: Go to next step 

  6. CHECK FLOOR WIRE 
    Fig 3: Checking Floor Wire
    G05292164Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Turn the ignition switch OFF.
    2. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
    3. Disconnect the front seat wire RH connector from the floor wire.

      HINT:

      The service wire has already been inserted into connector B.

    4. Measure the resistance of the wire harness side connector.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Specified Condition
      BE2-6 (FSR+) - BE2-7 (FSR-) Below 1 Ω
    5. Disconnect the front seat wire RH connector from the floor wire.
    6. Measure the resistance of the wire harness side connector.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Specified Condition
      BE2-6 (FSR+) - BE2-7 (FSR-) 1 MΩ or higher
      BE2-6 (FSR+) - Body ground 1 MΩ or higher
      BE2-7 (FSR-) - Body ground 1 MΩ or higher
    7. Turn the ignition switch OFF.
    8. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
    9. Disconnect the front seat wire RH connector from the floor wire.
    10. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
    11. Turn the ignition switch ON.
    12. Measure the voltage of the wire harness side connector.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      BE2-6 (FSR+) - Body ground Ignition switch ON Below 1 V
      BE2-7 (FSR-) - Body ground Ignition switch ON Below 1 V

    NG: REPLACE FLOOR WIRE 

    OK: REPLACE FRONT SEAT WIRE RH 

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