AIRBAG SYSTEM(w/ Occupant Classification System), Diagnostic DTC:B1650/32

DTC Code DTC Name
B1650/32 Occupant Classification System Malfunction

DESCRIPTION

The occupant classification system circuit consists of the airbag sensor assembly and occupant detection ECU.

If the airbag sensor assembly receives signals from the occupant detection ECU, it determines whether the instrument panel passenger airbag, front seat airbag RH and front seat outer belt assembly should be operated.

DTC B1650/32 is stored when a malfunction is detected in the occupant classification system circuit.

DTC No. Detection Item DTC Detection Condition Trouble Area
B1650/32 Occupant Classification System Malfunction

    One of the following conditions is met:

  • An occupant classification system malfunction.

  • The airbag sensor assembly detects a line short circuit signal, open circuit signal, short circuit to ground signal or short circuit to B+ signal in the occupant classification system circuit for 2 seconds.

  • An airbag sensor assembly malfunction.

  • Floor wire

  • Front seat wire RH

  • Occupant detection ECU

  • Airbag sensor assembly

WIRING DIAGRAM

A01V7F2E13
*a Md1
*b Occupant Detection ECU
*c Airbag Sensor Assembly

CAUTION / NOTICE / HINT

Note


  • After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

    Click here

  • When disconnecting the cable from the negative (-) battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected.

    Click here

  • After replacing the airbag sensor assembly, refer to initialization.

    Click here

PROCEDURE


  1. CHECK DTC


    1. Turn the ignition switch to ON, and wait for at least 10 seconds.

    2. Clear the DTCs.

      Click here


      Body Electrical > Occupant Detection > Clear DTCs

    3. Check for DTCs of the occupant detection ECU.

      Click here


      Body Electrical > Occupant Detection > Trouble Codes
      Result
      Proceed to
      DTC is not output
      DTC is output

    DTC is output

    GO TO OCCUPANT CLASSIFICATION SYSTEM Click here

    DTC is not output

  2. CHECK DTC


    1. Turn the ignition switch to ON, and wait for at least 60 seconds.

    2. Clear the DTCs.

      Click here


      Body Electrical > SRS Airbag > Clear DTCs

    3. Turn the ignition switch off.

    4. Turn the ignition switch to ON, and wait for at least 60 seconds.

    5. Check for DTCs.

      Click here


      Body Electrical > SRS Airbag > Trouble Codes
      Result
      Proceed to
      DTC B1650/32 is not output
      DTC B1650/32 is output

      Tech Tips

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


    DTC B1650/32 is not output

    USE SIMULATION METHOD TO CHECK Click here

    DTC B1650/32 is output

  3. CHECK CONNECTION OF 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 airbag sensor assembly and occupant detection ECU.

      Result
      Proceed to
      Connectors are properly connected
      Connectors are not properly connected

    Connectors are not properly connected

    CONNECT CONNECTORS PROPERLY

    Connectors are properly connected

  4. CHECK CONNECTORS


    1. A01V85ZC01
      *1 Occupant Detection ECU
      *2 Airbag Sensor Assembly

      Disconnect the connectors from the airbag sensor assembly and occupant detection ECU.

    2. Check that the connectors (on the airbag sensor assembly side and occupant detection ECU side) are not damaged.

      Result
      Proceed to
      Connectors are not deformed or damaged
      Connectors are deformed or damaged

    Connectors are deformed or damaged

    REPLACE HARNESS AND CONNECTOR

    Connectors are not deformed or damaged

  5. CHECK OCCUPANT DETECTION ECU CIRCUIT


    1. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

      A01VAR9C01
      *1 Occupant Detection ECU *2 Airbag Sensor Assembly
      *3 Connector E *4 Connector B
      *5 Service Wire - -
      *a

      Front view of wire harness connector

      (to Occupant Detection ECU)

      		 *b

      Rear view of wire harness connector

      (to Airbag Sensor Assembly)

    2. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      d16-7 - Body ground Ignition switch ON Below 1 V
      d16-4 - Body ground Ignition switch ON Below 1 V

    4. Turn the ignition switch off.

    5. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

    6. Using a service wire, connect terminals 9 (FSR+) and 17 (FSR-) of connector B.

      Note

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      d16-7 - d16-4 Always Below 1 Ω

    8. Disconnect the service wire from connector B.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      d16-7 - d16-4 Always 1 MΩ or higher
      d16-7 - Body ground Always 1 MΩ or higher
      d16-4 - Body ground Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE AIRBAG SENSOR ASSEMBLY Click here

    NG

  6. CHECK FLOOR WIRE


    1. Disconnect the front seat inner belt assembly RH connector from the floor wire.

      A01V91BC01
      *1 Occupant Detection ECU *2 Airbag Sensor Assembly
      *3 Front Seat Wire RH *4 Floor Wire
      *5 Connector C - Connector B
      *7 Service Wire - -
      *a

      Front view of wire harness connector

      (to Front Seat Wire RH)

      		 *b

      Rear view of wire harness connector

      (to Airbag Sensor Assembly)

    2. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

    3. Turn the ignition switch to ON.

    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      Md1-1 - Body ground Ignition switch ON Below 1 V
      Md1-5 - Body ground Ignition switch ON Below 1 V

    5. Turn the ignition switch off.

    6. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

    7. Using a service wire, connect terminals 9 (FSR+) and 17 (FSR-) of connector B.

      Note

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Md1-1 - Md1-5 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
      Md1-1 - Md1-5 Always 1 MΩ or higher
      Md1-1 - Body ground Always 1 MΩ or higher
      Md1-5 - Body ground Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE FRONT SEAT WIRE RH Click here

    NG

    REPLACE FLOOR WIRE