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 ignition 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
Tip:

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 ignition switch to ON, and wait for at least 60 seconds.

    2. Clear the DTCs.

      Click here

      Body Electrical > Occupant Detection > Clear DTCs

      Tip:

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

    3. Turn the ignition switch off.

    4. Turn the ignition switch to ON, 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
      Tip:

      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 ignition switch off.

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

    3. Replace the occupant detection ECU.

      Click here

      Tip:

      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 (-) battery terminal, and wait for at least 2 seconds.

    2. Turn the ignition switch to ON.

    3. Perform the zero point calibration.

      Click hereClick 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 hereClick here

      Standard

      27 to 33 kg (59.5 to 72.8 lb)

    Result

    Proceed to

    NEXT
    NEXT

    END (OCCUPANT DETECTION ECU WAS DEFECTIVE)