OCCUPANT CLASSIFICATION SYSTEM, Diagnostic DTC:B1788

DTC Code DTC Name
B1788 Rear Occupant Classification Sensor RH Collision Detection

DESCRIPTION

DTC B1788 is stored when the occupant detection ECU receives a collision detection signal sent by the rear occupant classification sensor RH if an accident occurs.

DTC B1788 is also stored when the front seat assembly RH is subjected to a strong impact, even if an actual accident does not occur.

If the vehicle was not in a collision, but the occupant detection ECU receives a collision detection signal and stores DTC B1788, the DTC can be cleared by performing the Zero Point Calibration and Sensitivity Check.

Therefore, if DTC B1788 is output, first perform Zero Point Calibration and Sensitivity Check.

DTC No. DTC Detection Condition Trouble Area
B1788

  • Rear occupant classification sensor RH sensed large load

  • Front seat frame with adjuster assembly RH malfunction

  • Front seat frame with adjuster assembly RH (Rear occupant classification sensor RH)

Tech Tips

When DTC B1650/32 is detected as a result of troubleshooting for the airbag system, check the DTCs stored in the occupant detection ECU. When DTC B1788 is output, perform troubleshooting for the DTC.

WIRING DIAGRAM

Refer to DTC B1783 Click here.

INSPECTION PROCEDURE

Note

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.

PROCEDURE

  1. PERFORM ZERO POINT CALIBRATION AND SENSITIVITY CHECK

    1. Using the Techstream, perform Zero Point Calibration and Sensitivity Check Click here.

      OK
      "Zero Point Calibration is complete." and "Sensitivity Check is complete." are displayed.
    NG

    REPLACE FRONT SEAT FRAME WITH ADJUSTER ASSEMBLY RH Click here

    OK

  2. CHECK DTC

    1. Clear the DTCs stored in the occupant detection ECU Click here.

    2. Clear the DTCs stored in the airbag sensor assembly Click here.

    3. Turn the ignition switch off.

    4. Turn the ignition switch to ON.

    5. Check for DTCs Click here.

      OK
      DTC B1788 is not output.

      Tech Tips

      Codes other than DTC B1788 may be output at this time, but they are not related to this check.

    6. Turn the ignition switch off.

    NG

    REPLACE FRONT SEAT FRAME WITH ADJUSTER ASSEMBLY RH Click here

    OK

    END

  3. REPLACE FRONT SEAT FRAME WITH ADJUSTER ASSEMBLY RH

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

    2. Replace the front seat frame with adjuster assembly RH Click here for TMMK Made Manual Seat, Click here for TMMK Made Power Seat, Click here for SIA Made Manual Seat, Click here for SIA Made Power Seat).

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

    NEXT

  4. PERFORM ZERO POINT CALIBRATION AND SENSITIVITY CHECK

    1. Using the Techstream, perform Zero Point Calibration and Sensitivity Check Click here.

    NEXT

    END