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Home >> Lexus >> 2019 >> UX 250h Base >> Repair and Diagnosis (Single Page) >> Restraints >> Air Bag, SRS >> Occupant Classification System (Diagnostic Codes & Symptom Tests) >> Occupant Classification System >> DTC B1785: Front Occupant Classification Sensor LH Collision Detection [10/2018 - ] >> Procedure
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DTC B1785: Front Occupant Classification Sensor LH Collision Detection [10/2018 - ]: Procedure

  1. PERFORM ZERO POINT CALIBRATION 
    1. Using the Techstream, perform Zero Point Calibration.

      Refer to INITIALIZATION [10/2018 - ]

      OK

      "Zero Point Calibration is complete." is displayed.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  5

    Result: 

    OK 

    See step  2

  2. CHECK DTC 
    1. Turn the ignition switch to ON, and wait for at least 60 seconds.
    2. Clear the DTCs stored in the occupant detection ECU.

      Body Electrical > Occupant Detection > Clear DTCs 

    3. Clear the DTCs stored in the airbag ECU assembly.

      Body Electrical > SRS Airbag > Clear DTCs 

    4. Turn the ignition switch off.
    5. Turn the ignition switch to ON, and wait for at least 10 seconds.
    6. Check for DTCs.

      Body Electrical > Occupant Detection > Trouble Codes 

      OK

      DTC B1785 is not output.

      HINT: 

      Codes other than DTC B1785 may be output at this time, but they are not related to this check.

    7. Turn the ignition switch off.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    END 

    Result: 

    NG 

    See step  3

  3. REPLACE FRONT SEAT ADJUSTER ASSEMBLY RH 
    1. Turn the ignition switch off.
    2. Disconnect the cable from the negative (-) auxiliary battery terminal.
    3. Replace the front seat adjuster assembly RH.

      Refer to DISASSEMBLY [10/2018 - ]

    4. Connect the cable to the negative (-) auxiliary battery terminal.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  4

  4. PERFORM ZERO POINT CALIBRATION 
    1. Using the Techstream, perform Zero Point Calibration.

      Refer to INITIALIZATION [10/2018 - ]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    END 

  5. REPLACE FRONT SEAT ADJUSTER ASSEMBLY RH 
    1. Turn the ignition switch off.
    2. Disconnect the cable from the negative (-) auxiliary battery terminal.
    3. Replace the front seat adjuster assembly RH.

      Refer to DISASSEMBLY [10/2018 - ]

    4. Connect the cable to the negative (-) auxiliary battery terminal.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  6

  6. PERFORM ZERO POINT CALIBRATION 
    1. Using the Techstream, perform Zero Point Calibration.

      Refer to INITIALIZATION [10/2018 - ]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    END