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Home >> Toyota >> 2009 >> Matrix Base, Standard >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Supplemental Restraint System >> Airbag System >> DTC B1650/32: Occupant Classification System Malfunction >> Inspection Procedure

Inspection Procedure

  1. CHECK FOR DTC (OCCUPANT CLASSIFICATION ECU) 
    1. Turn the ignition switch to ON.
    2. Using the Techstream, check for occupant classification ECU DTCs (See DTC CHECK / CLEAR ).

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

      OK: Go to Next Step 

  2. CHECK CONNECTORS 
    1. Turn the ignition switch off.
    2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
    3. Check that the connectors are properly connected to the center airbag sensor assembly and the occupant classification ECU. Also check that the connectors that link the front seat wire RH and No. 2 floor wire are properly connected.

      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 center airbag sensor assembly and the occupant classification ECU. Also disconnect the connectors that link the front seat wire RH and No. 2 floor wire.
    5. Check that the terminals of the connectors are not damaged.

      OK: 

      The terminals are not deformed or damaged  .

      NG: REPLACE WIRE HARNESS 

      OK: Go to Next Step 

  3. CHECK OCCUPANT CLASSIFICATION SYSTEM CIRCUIT (OPEN) 
    1. Connect the connectors that link the front seat wire RH and No. 2 floor wire.
    2. Using SST, connect terminals 12 (FSR+) and 13 (FSR-) of connector B.
      NOTE: Do not forcibly insert SST into the terminals of the connector.

      SST 09843-18040 

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

    Standard Resistance 

    TESTER CONNECTION SPECIFIED CONDITION CHART

    Tester Connection Condition Specified Condition
    S2-11 (FSR+) - S2-12 (FSR-) Always Below 1 Ω
    Fig 1: Checking Occupant Classification System Circuit (Open)
    G06036802Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: Go to step  7

    OK: Go to Next Step 

  4. CHECK OCCUPANT CLASSIFICATION SYSTEM CIRCUIT (SHORT) 
    1. Disconnect SST from connector B.
    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
    S2-11 (FSR+) - S2-12 (FSR-) Always 1 MΩ or higher
    Fig 2: Checking Occupant Classification System Circuit (Short)
    G06036804Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: Go to step  8

    OK: Go to Next Step 

  5. CHECK OCCUPANT CLASSIFICATION SYSTEM CIRCUIT (SHORT TO B+) 
    1. Connect the cable to the negative (-) battery terminal.
    2. Turn the ignition switch to ON.
    3. 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
    S2-11 (FSR+) - Body ground Ignition switch ON Below 1 V
    S2-12 (FSR-) - Body ground Ignition switch ON Below 1 V
    Fig 3: Checking Occupant Classification System Circuit (Short To B+)
    G06036804Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: Go to step  9

    OK: Go to Next Step 

  6. CHECK OCCUPANT CLASSIFICATION SYSTEM CIRCUIT (SHORT TO GROUND) 
    1. Turn the ignition switch off.
    2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
    3. Measure the resistance according to the value (s) in the table below.

    Standard Resistance 

    TESTER CONNECTION SPECIFIED CONDITION CHART

    Tester Connection Condition Specified Condition
    S2-11 (FSR+) - Body ground Always 1 MΩ or higher
    S2-12 (FSR-) - Body ground Always 1 MΩ or higher
    Fig 4: Checking Occupant Classification System Circuit (Short To Ground)
    G06036805Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    After replacing the center airbag sensor assembly, check for DTCs. If DTC B1650/32 is detected, replace the front seat cushion assembly (with occupant classification ECU and occupant classification sensor) (See REMOVAL ) and perform Initialization (See INITIALIZATION ) of the occupant classification system.

    NG: Go to step  10

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

  7. CHECK NO. 2 FLOOR WIRE (OPEN) 
    1. Disconnect the front seat wire RH connector from the No. 2 floor wire.
      Fig 5: Checking No. 2 Floor Wire (Open)
      G06036806Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT:

      SST has already been inserted into connector B.

    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
    MS1-5 (FSR+) - MS1-10 (FSR-) Always Below 1 Ω

    NG: REPLACE NO. 2 FLOOR WIRE 

    OK: REPLACE FRONT SEAT WIRE RH 

  8. CHECK NO. 2 FLOOR WIRE (SHORT) 
    1. Disconnect the front seat wire RH connector from the No. 2 floor 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
    MS1-5 (FSR+) - MS1-10 (FSR-) Always 1 MΩ or higher
    Fig 6: Checking No. 2 Floor Wire (Short)
    G06036807Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE NO. 2 FLOOR WIRE 

    OK: REPLACE FRONT SEAT WIRE RH 

  9. CHECK NO. 2 FLOOR WIRE (SHORT TO B+) 
    1. Turn the ignition switch off.
    2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
    3. Disconnect the front seat wire RH connector from the No. 2 floor wire.
    4. Connect the cable to the negative (-) battery terminal.
    5. Turn the ignition switch to ON.
    6. 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
    MS1-5 (FSR+) - Body ground Ignition switch ON Below 1 V
    MS1-10 (FSR-) - Body ground Ignition switch ON Below 1 V
    Fig 7: Checking No. 2 Floor Wire (Short To B+)
    G06036807Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE NO. 2 FLOOR WIRE 

    OK: REPLACE FRONT SEAT WIRE RH 

  10. CHECK NO. 2 FLOOR WIRE (SHORT TO GROUND) 
    1. Disconnect the front seat wire RH connector from the No. 2 floor 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
    MS1-5 (FSR+) - Body ground Always 1 MΩ or higher
    MS1-10 (FSR-) - Body ground Always 1 MΩ or higher
    Fig 8: Checking No. 2 Floor Wire (Short To Ground)
    G06036807Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE NO. 2 FLOOR WIRE 

    OK: REPLACE FRONT SEAT WIRE RH 

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