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DTC B1650/32: Occupant Classification System Malfunction [06/2017 - ]: Procedure

  1. CHECK DTC (OCCUPANT DETECTION ECU) 
    1. Check for DTCs of the occupant detection ECU (Refer to DTC CHECK / CLEAR [11/2015 - ] ).

      OK

      DTC is not output.

    4 

    NG 

    REFER TO OCCUPANT CLASSIFICATION SYSTEM 

    Refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2015 - ] )

    4 

    OK 

    See step  2

  2. CHECK CONNECTORS 
    1. Turn the ignition switch off.
    2. Disconnect the cable from the negative (-) auxiliary battery terminal.
      WARNING:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

    3. Check that the connectors are properly connected to the airbag sensor assembly and occupant detection ECU. Also check that the connectors that link the floor wire and front seat wire RH are properly connected.

      OK

      The connectors are properly connected.

      HINT: 

      If the connectors are not properly connected, reconnect the connectors and proceed to the next inspection.

    4. Disconnect the connectors from the airbag sensor assembly and occupant detection ECU. Also disconnect the connectors that link the floor wire and front seat wire RH.
    5. Check that the terminals of the connectors are not deformed or damaged.

      OK

      The terminals are not deformed or damaged.

    4 

    NG 

    REPLACE WIRE HARNESS 

    4 

    OK 

    See step  3

  3. CHECK WIRE HARNESS (AIRBAG SENSOR ASSEMBLY - OCCUPANT DETECTION ECU) 
    1. Connect the connectors that link the floor wire and front seat wire RH.
      GTY768126Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Occupant Detection ECU
      *2 Airbag Sensor Assembly
      *3 Service Wire
      *a Front view of wire harness connector
      (to Airbag Sensor Assembly)
      *b Front view of wire harness connector
      (to Occupant Detection ECU)
    2. Connect the cable to the negative (-) auxiliary battery terminal.
    3. Turn the ignition switch to ON (IG).
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      Y3-7 (FSR+) - Body ground Ignition switch ON (IG) Below 1 V
      Y3-4 (FSR-) - Body ground Ignition switch ON (IG) Below 1 V
    5. Turn the ignition switch off.
    6. Disconnect the cable from the negative (-) auxiliary battery terminal.
      WARNING:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

    7. Using a service wire, connect terminals 16 (FSR+) and 24 (FSR-) of connector B.
      NOTE:

      Do not forcibly insert the service wire into the terminals of the connector when connecting the wire.

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      Y3-7 (FSR+) - Y3-4 (FSR-) Always Below 1 Ω
    9. Disconnect the service wire from connector B.
    10. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      Y3-7 (FSR+) - Y3-4 (FSR-) Always 1 MΩ or higher
      Y3-7 (FSR+) - Body ground Always 1 MΩ or higher
      Y3-4 (FSR-) - Body ground Always 1 MΩ or higher

    4 

    OK 

    REPLACE AIRBAG SENSOR ASSEMBLY 

    Refer to REMOVAL [11/2015 - ] )

    4 

    NG 

    See step  4

  4. CHECK FLOOR WIRE 
    1. Disconnect the front seat wire RH from the floor wire.
      GTY743141Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Occupant Detection ECU
      *2 Airbag Sensor Assembly
      *3 Front Seat Wire RH
      *4 Floor Wire
      *5 Service Wire
      *a Front view of wire harness connector
      (to Airbag Sensor Assembly)
      *b Front view of wire harness connector
      (to Front Seat Wire RH)
    2. Connect the cable to the negative (-) auxiliary battery terminal.
    3. Turn the ignition switch to ON (IG).
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      MY1-1 (FSR+) - Body ground Ignition switch ON (IG) Below 1 V
      MY1-5 (FSR-) - Body ground Ignition switch ON (IG) Below 1 V
    5. Turn the ignition switch off.
    6. Disconnect the cable from the negative (-) auxiliary battery terminal.
      WARNING:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

    7. Using a service wire, connect terminals 16 (FSR+) and 24 (FSR-) of connector B.
      NOTE:

      Do not forcibly insert the service wire into the terminals of the connector when connecting the wire.

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      MY1-1 (FSR+) - MY1-5 (FSR-) Always Below 1 Ω
    9. Disconnect the service wire from connector B.
    10. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      MY1-1 (FSR+) - MY1-5 (FSR-) Always 1 MΩ or higher
      MY1-1 (FSR+) - Body ground Always 1 MΩ or higher
      MY1-5 (FSR-) - Body ground Always 1 MΩ or higher

    4 

    OK 

    REPLACE FRONT SEAT WIRE RH 

    4 

    NG 

    REPLACE FLOOR WIRE 

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