OCCUPANT CLASSIFICATION SYSTEM, Diagnostic DTC:B1796

DTC Code DTC Name
B1796 Sleep Operation Failure of Occupant Classification ECU

DESCRIPTION

During sleep mode, the occupant detection ECU monitors the condition of each sensor while the power switch is off. In this mode, if the occupant detection ECU detects an internal malfunction, DTC B1796 is stored.

DTC No. Detection Item DTC Detection Condition Trouble Area
B1796 Sleep Operation Failure of Occupant Classification ECU Occupant detection ECU malfunction. Occupant detection ECU

Tech Tips

Use the GTS to check for DTCs of the occupant detection ECU, otherwise the DTCs cannot be read.

CAUTION / NOTICE / HINT

Note

When disconnecting the cable, some systems need to be initialized after the cable is reconnected.

Click here

PROCEDURE


  1. CHECK DTC


    1. Turn the power switch on (IG), and wait for at least 60 seconds.

    2. Clear the DTCs.

      Click here


      Body Electrical > Occupant Detection > Clear DTCs

      Tech Tips

      Use the GTS to clear the DTCs of the occupant detection ECU, otherwise the DTCs cannot be cleared.

    3. Turn the power switch off.

    4. Turn the power switch on (IG), and wait for at least 60 seconds.

    5. Check for DTCs.

      Click here


      Body Electrical > Occupant Detection > Trouble Codes
      Result
      Proceed to
      DTC B1796 is not output
      DTC B1796 is output

      Tech Tips

      DTCs other than DTC B1796 may be output at this time, but they are not related to this check.


    DTC B1796 is not output

    USE SIMULATION METHOD TO CHECK Click here

    DTC B1796 is output

  2. REPLACE OCCUPANT DETECTION ECU


    1. Turn the power switch off.

    2. Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 90 seconds.

    3. Replace the occupant detection ECU.

      Click here

      Tech Tips

      Perform the inspection using parts from a normal vehicle when possible.

      Result
      Proceed to
      NEXT

    NEXT

  3. PERFORM ZERO POINT CALIBRATION


    1. Connect the cable to the negative (-) auxiliary battery terminal, and wait for at least 2 seconds.

    2. Turn the power switch on (IG).

    3. Perform the zero point calibration.

      Click here

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

    "Zero Point Calibration is complete." is displayed

  4. PERFORM SENSITIVITY CHECK


    1. Perform the sensitivity check.

      Click here

      Standard
      27 to 33 kg (59.5 to 72.8 lb)
      Result
      Proceed to
      NEXT

    NEXT

    END (OCCUPANT DETECTION ECU WAS DEFECTIVE)