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 center airbag sensor assembly and occupant classification system.

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

DTC No. DTC Detection Condition Trouble Area
B1650/32

  • The center airbag sensor assembly receives a line short circuit signal, an open circuit signal, a short circuit to ground signal or a short circuit to B+ signal in the occupant classification system circuit.

  • Occupant classification system malfunction

  • Center airbag sensor assembly malfunction

  • Junction connector

  • No. 2 floor wire

  • Front seat wire RH

  • Occupant classification system

  • Center airbag sensor assembly

WIRING DIAGRAM

A01EJDPE01

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK DTC (OCCUPANT CLASSIFICATION ECU)


    1. Turn the ignition switch to ON.

    2. Using the GTS, check for DTCs of the occupant classification ECU Click here.

      OK
      DTC is not output.

    NG

    REPAIR CIRCUITS INDICATED BY OUTPUT DTCS Click here

    OK

  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 occupant classification ECU. Also check that the connectors that link the front seat wire RH, junction connector and No. 2 floor wire are properly connected.

      OK
      The connectors are properly connected.

      Tech Tips

      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 occupant classification ECU. Also disconnect the connectors that link the front seat wire RH, junction connector and No. 2 floor wire.

    5. Check that the connector terminals are not damaged.

      OK
      The terminals are not deformed or damaged.

    NG

    REPLACE WIRE HARNESS

    OK

  3. CHECK OCCUPANT CLASSIFICATION SYSTEM CIRCUIT (OPEN)


    1. Connect the connectors that link the front seat wire RH, junction connector and No. 2 floor wire.

      A01EIQ7E01

    2. Using SST, connect terminals 16 (FSR+) and 24 (FSR-) of connector B.

      Note

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

      SST
      09843-18040

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      S12-8 (FSR+) - S12-4 (FSR-) Always Below 1 Ω
      Text in Illustration
      *1 Occupant Classification ECU *2 Center Airbag Sensor Assembly
      *3 Junction Connector *4

      Front view of wire harness connector

      (to Center Airbag Sensor Assembly)
      *5

      Front view of wire harness connector

      (to Occupant Classification ECU)

      		 *6 Connector B
      *7 Connector E - -

    NG

    CHECK NO. 2 FLOOR WIRE (OPEN) Click here

    OK

  4. CHECK OCCUPANT CLASSIFICATION SYSTEM CIRCUIT (SHORT)


    1. A01EJRUE02
      Text in Illustration
      *1 Occupant Classification ECU
      *2 Center Airbag Sensor Assembly
      *3 Junction Connector
      *4

      Front view of wire harness connector

      (to Occupant Classification ECU)
      *5 Connector E

      Disconnect SST from connector B.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      S12-8 (FSR+) - S12-4 (FSR-) Always 1 MΩ or higher

    NG

    CHECK NO. 2 FLOOR WIRE (SHORT) Click here

    OK

  5. CHECK OCCUPANT CLASSIFICATION SYSTEM CIRCUIT (SHORT TO B+)


    1. A01EJRUE02
      Text in Illustration
      *1 Occupant Classification ECU
      *2 Center Airbag Sensor Assembly
      *3 Junction Connector
      *4

      Front view of wire harness connector

      (to Occupant Classification ECU)
      *5 Connector E

      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 Switch Condition Specified Condition
      S12-8 (FSR+) - Body ground Ignition switch ON Below 1 V
      S12-4 (FSR-) - Body ground Ignition switch ON Below 1 V

    NG

    CHECK NO. 2 FLOOR WIRE (SHORT TO B+) Click here

    OK

  6. CHECK OCCUPANT CLASSIFICATION SYSTEM CIRCUIT (SHORT TO GROUND)


    1. A01EJRUE02
      Text in Illustration
      *1 Occupant Classification ECU
      *2 Center Airbag Sensor Assembly
      *3 Junction Connector
      *4

      Front view of wire harness connector

      (to Occupant Classification ECU)
      *5 Connector E

      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 Condition Specified Condition
      S12-8 (FSR+) - Body ground Always 1 MΩ or higher
      S12-4 (FSR-) - Body ground Always 1 MΩ or higher

      Tech Tips

      After replacing the center airbag sensor assembly, check for DTCs of the center airbag sensor assembly. If DTC B1650/32 is detected, replace the occupant classification ECU Click here and perform "zero point calibration" and "sensitivity check" of the occupant classification system Click here.


    NG

    CHECK NO. 2 FLOOR WIRE (SHORT TO GROUND) Click here

    OK

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here

  7. CHECK NO. 2 FLOOR WIRE (OPEN)


    1. Disconnect the junction connector from the No. 2 floor wire.

      A01ELFNE01

      Tech Tips

      SST 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
      M26-13 (FSR+) - M26-14 (FSR-) Always Below 1 Ω
      Text in Illustration
      *1 Occupant Classification ECU *2 Center Airbag Sensor Assembly
      *3 Front Seat Wire RH *4 Junction Connector
      *5 No. 2 Floor Wire *6

      Front view of wire harness connector

      (to Center Airbag Sensor Assembly)
      *7

      Front view of wire harness connector

      (to Junction Connector)

      		 *8 Connector B
      *9 Connector C - -

    NG

    REPLACE NO. 2 FLOOR WIRE

    OK

  8. CHECK FRONT SEAT WIRE RH (OPEN)


    1. Disconnect the front seat wire RH connector from the junction connector.

      A01EMMNE02

    2. Using SST, connect terminals 8 (FSR+) and 4 (FSR-) of connector E.

      Note

      Do not forcibly insert SST 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
      S14-14 (FSR+) - S14-13 (FSR-) Always Below 1 Ω
      Text in Illustration
      *1 Occupant Classification ECU *2 Center Airbag Sensor Assembly
      *3 Front Seat Wire RH *4 Junction Connector
      *5 No. 2 Floor Wire *6

      Front view of wire harness connector

      (to Junction Connector)
      *7

      Front view of wire harness connector

      (to Occupant Classification ECU)

      		 *8 Connector D
      *9 Connector E - -

    NG

    REPLACE FRONT SEAT WIRE RH

    OK

    REPLACE JUNCTION CONNECTOR

  9. CHECK NO. 2 FLOOR WIRE (SHORT)


    1. A01EKPAE02
      Text in Illustration
      *1 Occupant Classification ECU
      *2 Center Airbag Sensor Assembly
      *3 Front Seat Wire RH
      *4 Junction Connector
      *5 No. 2 Floor Wire
      *6

      Front view of wire harness connector

      (to Junction connector)
      *7 Connector C

      Disconnect the junction connector from the No. 2 floor wire.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      M26-13 (FSR+) - M26-14 (FSR-) Always 1 MΩ or higher

    NG

    REPLACE NO. 2 FLOOR WIRE

    OK

  10. CHECK FRONT SEAT WIRE RH (SHORT)


    1. A01EIYEE02
      Text in Illustration
      *1 Occupant Classification ECU
      *2 Center Airbag Sensor Assembly
      *3 Front Seat Wire RH
      *4 Junction Connector
      *5 No. 2 Floor Wire
      *6

      Front view of wire harness connector

      (to Junction connector)
      *7 Connector D

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      S14-14 (FSR+) - S14-13 (FSR-) Always 1 MΩ or higher

    NG

    REPLACE FRONT SEAT WIRE RH

    OK

    REPLACE JUNCTION CONNECTOR

  11. CHECK NO. 2 FLOOR WIRE (SHORT TO B+)


    1. A01EKPAE02
      Text in Illustration
      *1 Occupant Classification ECU
      *2 Center Airbag Sensor Assembly
      *3 Front Seat Wire RH
      *4 Junction Connector
      *5 No. 2 Floor Wire
      *6

      Front view of wire harness connector

      (to Junction connector)
      *7 Connector C

      Turn the ignition switch off.

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

    3. Disconnect the junction 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 Switch Condition Specified Condition
      M26-13 (FSR+) - Body ground Ignition switch ON Below 1 V
      M26-14 (FSR-) - Body ground Ignition switch ON Below 1 V

    NG

    REPLACE NO. 2 FLOOR WIRE

    OK

  12. CHECK FRONT SEAT WIRE RH (SHORT TO B+)


    1. A01EIYEE02
      Text in Illustration
      *1 Occupant Classification ECU
      *2 Center Airbag Sensor Assembly
      *3 Front Seat Wire RH
      *4 Junction Connector
      *5 No. 2 Floor Wire
      *6

      Front view of wire harness connector

      (to Junction connector)
      *7 Connector D

      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 junction connector.

    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 Switch Condition Specified Condition
      S14-14 (FSR+) - Body ground Ignition switch ON Below 1 V
      S14-13 (FSR-) - Body ground Ignition switch ON Below 1 V

    NG

    REPLACE FRONT SEAT WIRE RH

    OK

    REPLACE JUNCTION CONNECTOR

  13. CHECK NO. 2 FLOOR WIRE (SHORT TO GROUND)


    1. A01EKPAE02
      Text in Illustration
      *1 Occupant Classification ECU
      *2 Center Airbag Sensor Assembly
      *3 Front Seat Wire RH
      *4 Junction Connector
      *5 No. 2 Floor Wire
      *6

      Front view of wire harness connector

      (to Junction connector)
      *7 Connector C

      Disconnect the junction connector from the No. 2 floor wire.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      M26-13 (FSR+) - Body ground Always 1 MΩ or higher
      M26-14 (FSR-) - Body ground Always 1 MΩ or higher

    NG

    REPLACE NO. 2 FLOOR WIRE

    OK

  14. CHECK FRONT SEAT WIRE RH (SHORT TO GROUND)


    1. A01EIYEE02
      Text in Illustration
      *1 Occupant Classification ECU
      *2 Center Airbag Sensor Assembly
      *3 Front Seat Wire RH
      *4 Junction Connector
      *5 No. 2 Floor Wire
      *6

      Front view of wire harness connector

      (to Junction connector)
      *7 Connector D

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      S14-14 (FSR+) - Body ground Always 1 MΩ or higher
      S14-13 (FSR-) - Body ground Always 1 MΩ or higher

    NG

    REPLACE FRONT SEAT WIRE RH

    OK

    REPLACE JUNCTION CONNECTOR