OCCUPANT CLASSIFICATION SYSTEM, Diagnostic DTC:B1787

DTC Code DTC Name
B1787 Rear Occupant Classification Sensor LH Collision Detection

DESCRIPTION

DTC B1787 is stored when the occupant detection ECU receives a collision detection signal sent by the rear occupant classification sensor LH in the case of an accident.

DTC B1787 is also stored when the front seat assembly RH is subjected to a strong impact, even if an actual accident did not occur.

If the vehicle was not in a collision, but the occupant detection ECU receives a collision detection signal and stores DTC B1787, the DTC can be cleared by performing zero point calibration. Therefore, if DTC B1787 is output, first perform zero point calibration.

DTC No. Detection Item DTC Detection Condition Trouble Area
B1787 Rear Occupant Classification Sensor LH Collision Detection

  • Rear occupant classification sensor LH sensed large load.

  • Front seat adjuster assembly RH malfunction

 Rear occupant classification sensor LH (Front seat adjuster assembly RH)*

CAUTION / NOTICE / HINT

Note


  • When this DTC is stored, repair of the malfunction indicated can only be performed by initializing the occupant detection ECU or replacing the front seat adjuster assembly RH. Do not replace the occupant detection ECU to repair the malfunction indicated by this DTC.

    If the occupant detection ECU is replaced, this DTC will not be output but the occupant detection system may not function properly.

  • After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

    Click here

Tech Tips

When DTC B165A is stored as a result of troubleshooting for the airbag system, check the DTCs stored in the occupant detection ECU. When DTC B1787 is output, perform troubleshooting for this DTC first.

PROCEDURE


  1. PERFORM ZERO POINT CALIBRATION


    1. Using the GTS, perform Zero Point Calibration.

      Click here

      OK
      "Zero Point Calibration is complete." is displayed.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FRONT SEAT ADJUSTER ASSEMBLY RH Click here

    OK

  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 sensor 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 B1787 is not output.

      Tech Tips

      Codes other than DTC B1787 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

    OK

    END

    NG

  3. REPLACE FRONT SEAT ADJUSTER ASSEMBLY RH


    1. Turn the ignition switch off.

    2. Disconnect the cable from the negative (-) battery terminal.

    3. Replace the front seat adjuster assembly RH.

      Click here

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

      Result
      Proceed to
      NEXT

    NEXT

  4. PERFORM ZERO POINT CALIBRATION


    1. Using the GTS, perform Zero Point Calibration.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    END

  5. REPLACE FRONT SEAT ADJUSTER ASSEMBLY RH


    1. Turn the ignition switch off.

    2. Disconnect the cable from the negative (-) battery terminal.

    3. Replace the front seat adjuster assembly RH.

      Click here

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

      Result
      Proceed to
      NEXT

    NEXT

  6. PERFORM ZERO POINT CALIBRATION


    1. Using the GTS, perform Zero Point Calibration.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    END