Dtc B1796 Sleep Operation Failure Of Occupant Classification Ecu

Vehicle Interior. Yaris. Ncp93, 131
Supplemental Restraint Systems. Yaris. Ncp93, 131

DESCRIPTION

INSPECTION PROCEDURE

CHECK FOR DTC

REPLACE OCCUPANT CLASSIFICATION ECU

PERFORM ZERO POINT CALIBRATION AND SENSITIVITY CHECK

DTC B1796 Sleep Operation Failure of Occupant Classification ECU


DESCRIPTION

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

DTC Code
DTC Detection Condition
Trouble Area
B1796
Occupant classification ECU malfunction
Occupant classification ECU
HINT:
  1. When DTC B1650/32 is detected as a result of troubleshooting the airbag system, perform troubleshooting for DTC B1796 of the occupant classification system.
  2. Use the Techstream to check for DTCs of the occupant classification ECU, otherwise the DTCs cannot be read.

INSPECTION PROCEDURE

1.CHECK FOR DTC

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

  1. Clear any DTCs stored in the memory (YARIS_NCP93 RM0000010VK072X.html).

    HINT:
    1. First clear DTCs stored in the occupant classification ECU and then in the airbag sensor assembly.
    2. Use the Techstream to clear the DTCs of the occupant classification ECU, otherwise the DTCs cannot be cleared.

  1. Turn the ignition switch off.

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

  1. Using the Techstream, check for DTCs of the occupant classification ECU (YARIS_NCP93 RM0000010VK072X.html).

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


NG
Go to step 2
OK

USE SIMULATION METHOD TO CHECK (YARIS_NCP93 RM0000010VJ076X.html)

2.REPLACE OCCUPANT CLASSIFICATION ECU

  1. Turn the ignition switch off.

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

  1. Replace the occupant classification ECU (YARIS_NCP93 RM0000011JG02SX.html).

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

NEXT


3.PERFORM ZERO POINT CALIBRATION AND SENSITIVITY CHECK

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

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON.

  1. Using the Techstream, perform Zero Point Calibration and Sensitivity Check (YARIS_NCP93 RM0000010VN073X.html).


NEXT

END