B1796

SUPPLEMENTAL RESTRAINT SYSTEM: OCCUPANT CLASSIFICATION SYSTEM (for Separate Seat Type): B1796: Sleep Operation Failure of Occupant Classification ECU

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 set.





HINT:
- When DTC B1650/32 is detected as a result of troubleshooting the supplemental restraint system, perform troubleshooting for DTC B1796 of the occupant classification system.
- Use the Techstream to check for DTCs of the occupant classification ECU, otherwise the DTCs cannot be read.

INSPECTION PROCEDURE

PROCEDURE

1. CHECK DTC
(a) Turn the ignition switch to the ON position.
(b) Clear any DTCs stored in the memory (Reading and Clearing Diagnostic Trouble Codes).

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

(c) Turn the ignition switch to the LOCK position, and wait for at least 10 seconds.
(d) Turn the ignition switch to the ON position.
(e) Using the Techstream, check for DTCs of the occupant classification ECU (Reading and Clearing Diagnostic Trouble Codes).
OK:
DTC B1796 is not output.

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

OK -- USE SIMULATION METHOD TO CHECK
NG -- Continue to next step.
2. REPLACE OCCUPANT CLASSIFICATION ECU
(a) Turn the ignition switch to the LOCK position.
(b) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(c) Replace the occupant classification ECU.

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

NEXT -- Continue to next step.
3. PERFORM ZERO POINT CALIBRATION
(a) Connect the negative (-) terminal cable to the battery.
(b) Connect the Techstream to the DLC3.
(c) Turn the ignition switch to the ON position.
(d) Using the Techstream, perform the zero point calibration (Programming and Relearning).
OK:
"Zero Point Calibration is complete." is displayed on the Techstream.
NEXT -- Continue to next step.
4. PERFORM SENSITIVITY CHECK
(a) Using the Techstream, perform the sensitivity check (Programming and Relearning).
Standard :
Standard value: 27 to 33 kg (59.52 to 72.75 lb)
NEXT -- END