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HOMESERVICE MANUALSTOYOTA2009COROLLA S, 1.8 U, STANDARDREPAIR AND DIAGNOSISRESTRAINTSAIR BAG, SRSSUPPLEMENTAL RESTRAINT SYSTEMOCCUPANT CLASSIFICATION SYSTEMDTC B1797 CALIBRATION MALFUNCTIONINSPECTION PROCEDURE
2009 Toyota Corolla S, 1.8 U, Standard

Inspection Procedure

2009 Toyota Corolla S, 1.8 U, StandardSECTION 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 step 2 

    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 ).
    ITEM/RANGE REFERENCE 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 CHART

    Result Proceed to
    All items correspond to the range of specified condition for zero point calibration. A
    THERMISTOR TEMP does not correspond to the range of specified condition for zero point calibration. B

    B: Go to step  6

    A: Go to next step 

  3. CHECK FOR DTC 

    HINT:

    Check that the zero point calibration is completed normally. If any 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 the 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 ON-VEHICLE INSPECTION ).
    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 the 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 ).

    NEXT: END 

RENDER: 1.0x

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