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Home >> Toyota >> 2009 >> Matrix Base, Standard >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Supplemental Restraint System >> Occupant Classification System >> DTC B1797: Calibration Malfunction >> Inspection Procedure

Inspection Procedure

  1. CHECK FOR DTC 
    1. Turn the ignition switch to ON.
    2. Clear the DTCs stored in the occupant classification ECU (See DTC CHECK / CLEAR ).
    3. Clear the DTCs stored in the center airbag sensor assembly (See DTC CHECK / CLEAR ).
    4. Turn the ignition switch off.
    5. Turn the ignition switch to ON, and wait for at least 10 seconds.
    6. Check for DTCs (See DTC CHECK / CLEAR ).

      OK: 

      DTC B1797 is not output  .

      HINT:

      Codes other than B1797 may be output at this time, but they are not related to this check.

      NG: Go to Next Step 

      OK: PERFORM ZERO POINT CALIBRATION (See  INITIALIZATION  ) 

  2. READ VALUE USING DATA LIST (SPECIFIED CONDITION FOR ZERO POINT CALIBRATION) 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Using the Techstream, read the Data List (See DATA LIST / ACTIVE TEST ).
    TESTER DISPLAY NORMAL CONDITION CHART

    Tester Display Measurement Item/Range Normal Condition Specified Condition for Zero Point Calibration
    Pressure Sensor Output Pressure sensor output/
    Min.: 0
    Max.: 255    		 0 to 210 (reference value) 0 to 2
    Thermistor Temperature Output Thermistor temperature output/
    Min.: -40°C (-40°F)
    Max.: 90°C (194°F)    		 -40 to 85°C (-40 to 185°F) 3 to 40°C (37 to 104°F)
    Number of Present DTC Number of present trouble codes/
    Min.: 0
    Max.: 255    		 0 0
    Number of Past DTC Number of past trouble codes/
    Min.: 0
    Max.: 255    		 0 0

    Result 

    RESULT REFERENCE

    Result Proceed to
    All items satisfy the specified condition for zero point calibration. A
    "Thermistor Temperature Output" does not satisfy the specified condition for zero point calibration. B

    B: Go to step  6

    A: Go to Next Step 

  3. CHECK FOR DTC 

    HINT:

    Check that zero point calibration is completed normally. If either of the following conditions is met, DTC B1797 will be output (Refer to Initialization: See INITIALIZATION ).

    • Zero point calibration is performed when the calibration conditions are not satisfied.
    • Zero point calibration has failed.
    1. Turn the ignition switch to ON.
    2. Clear the DTCs stored in the occupant classification ECU (See DTC CHECK / CLEAR ).
    3. Clear the DTCs stored in the center airbag sensor assembly (See DTC CHECK / CLEAR ).
    4. Turn the ignition switch off.
    5. Turn the ignition switch to ON.
    6. Check for DTCs (See DTC CHECK / CLEAR ).

      OK: 

      DTC B1797 is not output  .

  4. PERFORM ZERO POINT CALIBRATION 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Using the Techstream, perform zero point calibration (See INITIALIZATION ).
    4. Turn the ignition switch off.
    5. Turn the ignition switch to ON.
    6. Clear the DTCs stored in the memory (See DTC CHECK / CLEAR ).

      HINT:

      If the DTCs are not cleared at this time, past DTCs will remain.

  5. CHECK FOR DTC 
    1. Turn the ignition switch to ON.
    2. Clear the DTCs stored in the occupant classification ECU (See DTC CHECK / CLEAR ).
    3. Clear the DTCs stored in the center airbag sensor assembly (See DTC CHECK / CLEAR ).
    4. Turn the ignition switch off.
    5. Turn the ignition switch to ON.
    6. Check for DTCs (See DTC CHECK / CLEAR ).

      OK: 

      DTC B1797 is not output  .

      HINT:

      Codes other than B1797 may be output at this time, but they are not related to this check.

      NEXT: END 

  6. REPLACE OCCUPANT CLASSIFICATION SENSOR (FRONT SEAT CUSHION ASSEMBLY) 
    1. Turn the ignition switch off.
    2. Disconnect the cable from the negative (-) battery terminal.
    3. Replace the front seat cushion assembly (with occupant classification ECU and occupant classification sensor) (See REMOVAL ).
    4. Connect the cable to the negative (-) battery terminal.
    5. Turn the ignition switch to ON.
    6. Clear the DTCs stored in the occupant classification ECU (See DTC CHECK / CLEAR ).
    7. Clear the DTCs stored in the center airbag sensor assembly (See DTC CHECK / CLEAR ).
    8. Turn the ignition switch off.
    9. Turn the ignition switch to ON.
    10. Using the Techstream, check for occupant classification ECU DTCs (See DTC CHECK / CLEAR ).

      OK: 

      DTC is not output  .

  7. PERFORM ZERO POINT CALIBRATION 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Using the Techstream, perform zero point calibration (See INITIALIZATION ).
    4. Turn the ignition switch off.
    5. Turn the ignition switch to ON.
    6. Clear the DTCs stored in the occupant classification ECU (See DTC CHECK / CLEAR ).

      HINT:

      If the DTCs are not cleared at this time, past DTCs will remain.

  8. CHECK FOR DTC 
    1. Turn the ignition switch to ON.
    2. Clear the DTCs stored in the occupant classification ECU (See DTC CHECK / CLEAR ).
    3. Clear the DTCs stored in the center airbag sensor assembly (See DTC CHECK / CLEAR ).
    4. Turn the ignition switch off.
    5. Turn the ignition switch to ON.
    6. Check for DTCs (See DTC CHECK / CLEAR ).

      OK: 

      DTC B1797 is not output  .

  9. PERFORM SENSITIVITY CHECK 
    1. Perform the sensitivity check (See INITIALIZATION ).
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