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Home >> Toyota >> 2017 >> Highlander XLE, FWD >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Supplemental Restraint System - Diagnostic Codes & Circuit Tests - (Except Hybrid) >> Airbag System >> DTC B1650-32: Occupant Classification System Malfunction [12/2013 - ] >> Procedure

DTC B1650-32: Occupant Classification System Malfunction [12/2013 - ]: Procedure

  1. CHECK DTC (OCCUPANT DETECTION ECU) 
    1. Check for occupant detection ECU DTCs.

      Refer to DTC CHECK / CLEAR [12/2013 - ]

      Body Electrical > Occupant Detection > Trouble Codes 

      OK

      DTCs are not output.

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    GO TO OCCUPANT CLASSIFICATION SYSTEM. Refer to  DIAGNOSTIC TROUBLE CODE CHART [12/2013 - 11/2016]  Refer to  DIAGNOSTIC TROUBLE CODE CHART [11/2016 - ] 

    Result:  1

    OK 

    See step  2

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

      Wait at least 90 seconds after disconnecting the cable from the negative (-) 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 damaged.

      OK

      The terminals are not deformed or damaged.

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    REPLACE WIRE HARNESS 

    Result:  1

    OK 

    See step  3

  3. CHECK OCCUPANT CLASSIFICATION SYSTEM CIRCUIT (OPEN) 
    1. Connect the connectors that link the floor wire and front seat wire RH.
      GTY432634Courtesy 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. 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.

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      d15-7 (FSR+) - d15-4 (FSR-) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    See step  10

    Result:  1

    OK 

    See step  4

  4. CHECK OCCUPANT CLASSIFICATION SYSTEM CIRCUIT (SHORT) 
    1. Disconnect the service wire from connector B.
      GTY428692Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Occupant Detection ECU
      *2 Airbag Sensor Assembly
      *a Front view of wire harness connector
      (to Occupant Detection ECU)
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      d15-7 (FSR+) - d15-4 (FSR-) Always 1 MΩ or higher

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    See step  9

    Result:  1

    OK 

    See step  5

  5. CHECK OCCUPANT CLASSIFICATION SYSTEM CIRCUIT (SHORT TO B+) 
    1. Connect the cable to the negative (-) battery terminal.
      GTY428692Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Occupant Detection ECU
      *2 Airbag Sensor Assembly
      *a Front view of wire harness connector
      (to Occupant Detection ECU)
    2. Turn the ignition switch to ON.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      d15-7 (FSR+) - Body ground Ignition switch ON Below 1 V
      d15-4 (FSR-) - Body ground Ignition switch ON Below 1 V
    4. Turn the ignition switch to ON.
    5. Disconnect the cable from the negative (-) battery terminal.
      WARNING:

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

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    See step  8

    Result:  1

    OK 

    See step  6

  6. CHECK OCCUPANT CLASSIFICATION SYSTEM CIRCUIT (SHORT TO GROUND) 
    1. Measure the resistance according to the value(s) in the table below.
      GTY428692Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Occupant Detection ECU
      *2 Airbag Sensor Assembly
      *a Front view of wire harness connector
      (to Occupant Detection ECU)

      Standard Resistance

      Tester Connection Condition Specified Condition
      d15-7 (FSR+) - Body ground Always 1 MΩ or higher
      d15-4 (FSR-) - Body ground Always 1 MΩ or higher

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

    REPLACE AIRBAG SENSOR ASSEMBLY. Refer to  REMOVAL [12/2013 - ] 

    Result:  2

    NG 

    See step  7

  7. CHECK FLOOR WIRE (SHORT TO GROUND) 
    1. Disconnect the front seat wire RH from the floor wire.
      GTY429198Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Occupant Detection ECU
      *2 Airbag Sensor Assembly
      *3 Front Seat Wire RH
      *4 Floor Wire
      *a Front view of wire harness connector
      (to Front Seat Wire RH)
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      Ld2-1 (FSR+) - Body ground Always 1 MΩ or higher
      Ld2-4 (FSR-) - Body ground Always 1 MΩ or higher

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

    REPLACE FRONT SEAT WIRE RH 

    Result:  2

    NG 

    REPLACE FLOOR WIRE 

  8. CHECK FLOOR WIRE (SHORT TO B+) 
    1. Disconnect the front seat wire RH from the floor wire.
      GTY429198Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Occupant Detection ECU
      *2 Airbag Sensor Assembly
      *3 Front Seat Wire RH
      *4 Floor Wire
      *a Front view of wire harness connector
      (to Front Seat Wire RH)
    2. Connect the cable to the negative (-) battery terminal.
    3. Turn the ignition switch to ON.
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      Ld2-1 (FSR+) - Body ground Ignition switch ON Below 1 V
      Ld2-4 (FSR-) - Body ground Ignition switch ON Below 1 V

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

    REPLACE FRONT SEAT WIRE RH 

    Result:  2

    NG 

    REPLACE FLOOR WIRE 

  9. CHECK FLOOR WIRE (SHORT) 
    1. Disconnect the front seat wire RH from the floor wire.
      GTY429198Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Occupant Detection ECU
      *2 Airbag Sensor Assembly
      *3 Front Seat Wire RH
      *4 Floor Wire
      *a Front view of wire harness connector
      (to Front Seat Wire RH)
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      Ld2-1 (FSR+) - Ld2-4 (FSR-) Always 1 MΩ or higher

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

    REPLACE FRONT SEAT WIRE RH 

    Result:  2

    NG 

    REPLACE FLOOR WIRE 

  10. CHECK FLOOR WIRE (OPEN) 
    1. Disconnect the front seat wire RH from the floor wire.
      GTY425929Courtesy 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)

      HINT: 

      The service wire has already been inserted into connector B.

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      Ld2-1 (FSR+) - Ld2-4 (FSR-) Always Below 1 Ω
    3. Disconnect the service wire from connector B.

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

    REPLACE FRONT SEAT WIRE RH 

    Result:  2

    NG 

    REPLACE FLOOR WIRE 

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