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Home >> Lexus >> 2007 >> LS 460L >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Supplemental Restraint System >> Airbag System >> DTC B1650/32 Occupant Classification System Malfunction >> Inspection Procedure

Inspection Procedure

NOTE: After the engine switch is turned off, the HDD navigation system requires approximately 6 minutes to record various types of memory and settings. As a result, after turning the engine switch off, wait 6 minutes or more before disconnecting the cable from the negative (-) battery terminal.
  1. CHECK FOR DTC (OCCUPANT CLASSIFICATION ECU) 
    1. Turn the engine switch on (IG), and wait for at least 10 seconds.
    2. Check for the DTCs of the occupant classification ECU (see DTC CHECK/CLEAR  ).

      OK: DTC is not output. 

    NG: REPAIR CIRCUITS INDICATED BY OUTPUT DTCS (See  DIAGNOSTIC TROUBLE CODE CHART   ) 

    OK: GO TO NEXT STEP 

  2. CHECK FOR DTC (CENTER AIRBAG SENSOR) 
    1. Turn the engine switch on (IG), and wait for at least 60 seconds.
    2. Clear the DTCs (see DTC CHECK / CLEAR  ).
      Fig 1: Identifying Center Airbag Sensor And ECU
      G04951023Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Turn the engine switch off.
    4. Turn the engine switch on (IG), 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.

    NG: Go to step 3 

    OK: USE SIMULATION METHOD TO CHECK (See  DIAGNOSIS SYSTEM   ) 

  3. CHECK CONNECTION OF CONNECTORS 
    1. Turn the engine 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: Identifying Front View Of Wire Harness Connector And Rear View Of Wire Harness Connector
    G04951024Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Using a service wire, connect terminals 16 (FSR+) and 22 (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 according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      e10-11 (FSR+)-e10-12 (FSR-) Always Below 1 Ω
    3. Disconnect the service wire from connector B.
    4. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      e10-11 (FSR+)-e10-12 (FSR-) Always 1 MΩ or higher
      e10-11(FSR+)-Body ground Always 1 MΩ or higher
      e10-12(FSR-)-Body ground Always 1 MΩ or higher
    5. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
    6. Turn the engine switch on (IG).
    7. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Switch Condition Specified Condition
      e10-11(FSR+)-Body ground Engine switch on (IG) Below 1 V
      e10-12 (FSR-) - Body ground Engine switch on (IG) Below 1 V

    NG: Go to step 6 

    OK: REPLACE CENTER AIRBAG SENSOR ASSEMBLY (See  CENTER AIRBAG SENSOR ASSEMBLY   ) 

  6. CHECK FLOOR WIRE 
    Fig 3: Identifying Joining Connector And Center Airbag Sensor
    G04951025Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Turn the engine 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.
    4. Using a service wire, connect terminals 16 (FSP+) and 24 (FSP-) of connector B.
    5. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      Re3-2 (FSR+) - Re3-3 (FSR-) Always Below 1 Ω
    6. Disconnect the service wire from connector B.
    7. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      Re3-2 (FSR+) - Re3-3 (FSR-) Always 1 MΩ or higher
      Re3-2 (FSR+) - Body ground Always 1 MΩ or higher
      Re3-3 (FSR-) - Body ground Always 1 MΩ or higher
    8. Turn the engine switch off.
    9. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
    10. Disconnect the front seat wire RH connector from the floor wire.
    11. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
    12. Turn the engine switch on (IG).
    13. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Switch Condition Specified Condition
      Re3-2 (FSR+) - Body ground Engine switch on (IG) Below 1 V
      Re3-3 (FSR-) - Body ground Engine switch on (IG) Below 1 V

    NG: REPLACE FLOOR WIRE 

    OK: REPLACE FRONT SEAT WIRE RH 

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