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Home >> Lexus >> 2012 >> CT 200h F Sport >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Airbag System (Diagnostic Codes (B1650/32 - B1905/74) & Symptom Tests) >> Airbag System >> DTC B1650/32: Occupant Classification System Malfunction >> Procedure

DTC B1650/32: Occupant Classification System Malfunction: Procedure

  1. CHECK DTC (OCCUPANT DETECTION ECU) 
    1. Turn the power switch on (IG).
    2. Check for DTCs of the occupant detection ECU. Refer to DTC CHECK / CLEAR .

      OK

      DTC is not output.

    NG → See step   12 

    OK: Go to next step 

  2. CHECK CONNECTORS 
    1. Turn the power 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 No. 2 floor wire and front seat wire RH are properly connected.

      OK

      The connectors are properly connected.

      HINT: 

      If the connectors are not connected securely, 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 No. 2 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.

    NG → REPLACE WIRE HARNESS 

    OK: Go to next step 

  3. CHECK OCCUPANT CLASSIFICATION SYSTEM CIRCUIT (OPEN) 
    1. Connect the connectors that link the No. 2 floor wire and front seat wire RH.
      Fig 1: Identifying Q1 And W4 Connector Terminals
      GTY354963Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Using SST, connect terminals 12 (FSR+) and 13 (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
      W4-8 (FSR+) - W4-4 (FSR-) Always Below 1 Ω
      TEXT IN ILLUSTRATION

      *1 Occupant Detection ECU *2 Airbag Sensor Assembly
      *3 Connector B *4 Connector E
      *a Front view of wire harness connector
      (to Airbag Sensor Assembly)      		 *b Front view of wire harness connector
      (to Occupant Detection ECU)

    NG → See step   7 

    OK: Go to next step 

  4. CHECK OCCUPANT CLASSIFICATION SYSTEM CIRCUIT (SHORT) 
    1. Disconnect SST from connector B.
      Fig 2: Identifying W4 Connector Terminals
      GTY351704Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      W4-8 (FSR+) - W4-4 (FSR-) Always 1 MΩ or higher
      TEXT IN ILLUSTRATION

      *1 Occupant Detection ECU
      *2 Airbag Sensor Assembly
      *3 Connector E
      *a Front view of wire harness connector
      (to Occupant Detection ECU)

    NG → See step   8 

    OK: Go to next step 

  5. CHECK OCCUPANT CLASSIFICATION SYSTEM CIRCUIT (SHORT TO B+) 
    1. Connect the cable to the negative (-) auxiliary battery terminal.
      Fig 3: Identifying W4 Connector Terminals
      GTY351704Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    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
      W4-8 (FSR+) - Body ground Power switch on (IG) Below 1 V
      W4-4 (FSR-) - Body ground Power switch on (IG) Below 1 V
      TEXT IN ILLUSTRATION

      *1 Occupant Detection ECU
      *2 Airbag Sensor Assembly
      *3 Connector E
      *a Front view of wire harness connector
      (to Occupant Detection ECU)

    NG → See step   9 

    OK: Go to next step 

  6. CHECK OCCUPANT CLASSIFICATION SYSTEM CIRCUIT (SHORT TO GROUND) 
    1. Turn the power switch off.
      Fig 4: Identifying W4 Connector Terminals
      GTY351704Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    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. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      W4-8 (FSR+) - Body ground Always 1 MΩ or higher
      W4-4 (FSR-) - Body ground Always 1 MΩ or higher
      TEXT IN ILLUSTRATION

      *1 Occupant Detection ECU
      *2 Airbag Sensor Assembly
      *3 Connector E
      *a Front view of wire harness connector
      (to Occupant Detection ECU)

    NG → See step   10 

    OK → See step   11 

  7. CHECK NO. 2 FLOOR WIRE (OPEN) 
    1. Disconnect the front seat wire RH from the No. 2 floor wire.
      Fig 5: Identifying Q1 And Qw2 Connector Terminals
      GTY349263Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT: 

      SST 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
      QW2-7 (FSR+) - QW2-3 (FSR-) Always Below 1 Ω
      TEXT IN ILLUSTRATION

      *1 Occupant Detection ECU *2 Airbag Sensor Assembly
      *3 Front Seat Wire RH *4 No. 2 Floor Wire
      *5 Connector B *6 Connector C
      *a Front view of wire harness connector
      (to Airbag Sensor Assembly)      		 *b Front view of wire harness connector
      (to Front Seat Wire RH)

    NG → REPLACE NO. 2 FLOOR WIRE 

    OK → REPLACE FRONT SEAT WIRE RH 

  8. CHECK NO. 2 FLOOR WIRE (SHORT) 
    1. Disconnect the front seat wire RH from the No. 2 floor wire.
      Fig 6: Identifying QW2 Connector Terminals
      GTY355462Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      QW2-7 (FSR+) - QW2-3 (FSR-) Always 1 MΩ or higher
      TEXT IN ILLUSTRATION

      *1 Occupant Detection ECU
      *2 Airbag Sensor Assembly
      *3 Front Seat Wire RH
      *4 No. 2 Floor Wire
      *5 Connector C
      *a Front view of wire harness connector
      (to Front Seat Wire RH)

    NG → REPLACE NO. 2 FLOOR WIRE 

    OK → REPLACE FRONT SEAT WIRE RH 

  9. CHECK NO. 2 FLOOR WIRE (SHORT TO B+) 
    1. Turn the power switch off.
      Fig 7: Identifying QW2 Connector Terminals
      GTY355462Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    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. Disconnect the front seat wire RH from the No. 2 floor wire.
    4. Connect the cable to the negative (-) auxiliary battery terminal.
    5. Turn the power switch on (IG).
    6. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      QW2-7 (FSR+) - Body ground Power switch on (IG) Below 1 V
      QW2-3 (FSR-) - Body ground Power switch on (IG) Below 1 V
      TEXT IN ILLUSTRATION

      *1 Occupant Detection ECU
      *2 Airbag Sensor Assembly
      *3 Front Seat Wire RH
      *4 No. 2 Floor Wire
      *5 Connector C
      *a Front view of wire harness connector
      (to Front Seat Wire RH)

    NG → REPLACE NO. 2 FLOOR WIRE 

    OK → REPLACE FRONT SEAT WIRE RH 

  10. CHECK NO. 2 FLOOR WIRE (SHORT TO GROUND) 
    1. Disconnect the front seat wire RH from the No. 2 floor wire.
      Fig 8: Identifying QW2 Connector Terminals
      GTY355462Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      QW2-7 (FSR+) - Body ground Always 1 MΩ or higher
      QW2-3 (FSR-) - Body ground Always 1 MΩ or higher
      TEXT IN ILLUSTRATION

      *1 Occupant Detection ECU
      *2 Airbag Sensor Assembly
      *3 Front Seat Wire RH
      *4 No. 2 Floor Wire
      *5 Connector C
      *a Front view of wire harness connector
      (to Front Seat Wire RH)

    NG → REPLACE NO. 2 FLOOR WIRE 

    OK → REPLACE FRONT SEAT WIRE RH 

  11. REPLACE AIRBAG SENSOR ASSEMBLY. Refer to  REMOVAL 
  12. REPAIR CIRCUITS INDICATED BY OUTPUT DTCS. Refer to  DIAGNOSTIC TROUBLE CODE CHART 
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