AIRBAG 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 ECU assembly and occupant detection ECU.

If the airbag ECU 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 ECU 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 ECU assembly malfunction.

  • Floor wire

  • Front seat wire RH

  • Occupant detection ECU

  • Airbag ECU assembly

WIRING DIAGRAM

B002KEFE24
*a Pf2
*b Occupant Detection ECU
*c Airbag ECU Assembly

CAUTION / NOTICE / HINT

Note


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

    Click here

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

    Click here

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

    Click here

PROCEDURE


  1. CHECK DTC


    1. Turn the power switch on (IG), and wait for at least 10 seconds.

    2. Clear the DTCs.

      Click here


      Body Electrical > Occupant Detection > Clear DTCs

      Tech Tips


      • Use the GTS to clear the DTCs of the occupant detection ECU, otherwise the DTCs cannot be cleared.

      • First clear the DTCs stored in the occupant detection ECU, and then clear the DTCs storedin the airbag ECU assembly.

    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. Clear the DTCs.

      Click here


      Body Electrical > SRS Airbag > Clear DTCs

    2. Turn the power switch off.

    3. Turn the power switch on (IG), and wait for at least 60 seconds.

    4. 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 power switch off.

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

    3. Check that the connectors are properly connected to the airbag ECU 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. B002JS5C04
      *1 Occupant Detection ECU
      *2 Airbag ECU Assembly
      *3 Front Seat Wire RH
      *4 Floor Wire

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

    2. Check that the connectors (on the airbag ECU 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 FRONT SEAT WIRE RH OR FLOOR WIRE

    Connectors are not deformed or damaged

  5. CHECK OCCUPANT DETECTION ECU CIRCUIT


    1. B002L2GC09
      *1 Occupant Detection ECU
      *2 Airbag ECU 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 ECU Assembly)

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

    2. Turn the power switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      f15-7 (FSR+) - Body ground Power switch on (IG) Below 1 V
      f15-4 (FSR-) - Body ground Power switch on (IG) Below 1 V

    4. Turn the power switch off.

    5. Disconnect the cable from the negative (-) auxiliary 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.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      f15-7 (FSR+) - f15-4 (FSR-) 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
      f15-7 (FSR+) - f15-4 (FSR-) Always 1 MΩ or higher
      f15-7 (FSR+) - Body ground Always 1 MΩ or higher
      f15-4 (FSR-) - Body ground Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    CHECK FRONT SEAT WIRE RH Click here

    OK

  6. CHECK DTC


    1. B002IA3C02
      *1 Occupant Detection ECU
      *2 Airbag ECU Assembly

      Connect the connectors to the airbag ECU assembly and occupant detection ECU.

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

    3. Turn the power switch on (IG), and wait for at least 60 seconds.

    4. Clear the DTCs.

      Click here


      Body Electrical > SRS Airbag > Clear DTCs

    5. Turn the power switch off.

    6. Turn the power switch on (IG), and wait for at least 60 seconds.

    7. 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 output

    REPLACE AIRBAG ECU ASSEMBLY Click here

    DTC B1650/32 is not output

    USE SIMULATION METHOD TO CHECK Click here

  7. CHECK FRONT SEAT WIRE RH


    1. B002JY8C03
      *1 Front Seat Wire RH
      *2 Floor Wire
      *3 Occupant Detection ECU
      *4 Airbag ECU Assembly
      *5 Service Wire
      *6 Connector E
      *7 Connector D
      *a

      Front view of wire harness connector

      (to Occupant Detection ECU)
      *b

      Front view of wire harness connector

      (to Floor Wire)

      Disconnect the front seat wire RH connector from the floor wire.

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

    3. Turn the power switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      Pf2-7 (FSR+) - Body ground Power switch on (IG) Below 1 V
      Pf2-3 (FSR-) - Body ground

    5. Turn the power switch off.

    6. Disconnect the connector from the occupant detection ECU.

    7. Using a service wire, connect terminals 7 (FSR+) and 4 (FSR-) of connector E.

      Note

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Pf2-7 (FSR+) - Pf2-3 (FSR-) Always Below 1 Ω

    9. Disconnect the service wire from connector E.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Pf2-7 (FSR+) - Pf2-3 (FSR-) Always 1 MΩ or higher
      Pf2-7 (FSR+) - Body ground
      Pf2-3 (FSR-) - Body ground
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE FRONT SEAT WIRE RH

    NG

    REPLACE FLOOR WIRE