B1795

SUPPLEMENTAL RESTRAINT SYSTEM: OCCUPANT CLASSIFICATION SYSTEM: B1795: Occupant Classification ECU Malfunction

DTC B1795 - Occupant Classification ECU Malfunction

DESCRIPTION

DTC B1795 is recorded when a malfunction is detected in the occupant classification ECU.





HINT: When DTC B1650/32 is detected as a result of troubleshooting for the "AIRBAG SYSTEM", check the DTCs stored in the occupant classification ECU. When DTC B1795 is output, perform troubleshooting for the DTC.

INSPECTION PROCEDURE
HINT:
- If troubleshooting (wire harness inspection) is difficult to perform, remove the front passenger seat installation bolts to see the undersurface of the seat cushion.
- In the above case, hold the seat so that it does not fall down. Holding the seat for a long period of time may cause a problem, such as seat rail deformation. Hold the seat only as necessary.

PROCEDURE

1. CHECK FOR DTC
(a) Turn the ignition switch to ON.
(b) Clear the DTCs stored in the occupant classification ECU Reading and Clearing Diagnostic Trouble Codes.
(c) Clear the DTCs stored in the center airbag sensor DTC Check / Clear.
(d) Turn the ignition switch to OFF.
(e) Turn the ignition switch to ON, and wait for at least 10 seconds.
(f) Check for the DTCs Reading and Clearing Diagnostic Trouble Codes.
OK:
DTC B1795 is not output.
HINT: Codes other than DTC B1795 may be output at this time, but they are not related to this check.

NG -- PERFORM REGISTRATION BEFORE ECU EXCHANGE
OK -- USE SIMULATION METHOD TO CHECK
2. PERFORM REGISTRATION BEFORE ECU EXCHANGE
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Using the Techstream, save the ECU data from the ECU which was installed on the vehicle Registration.
NEXT -- Continue to next step.
3. REPLACE OCCUPANT CLASSIFICATION ECU
(a) Turn the ignition switch to OFF.
(b) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(c) Replace the occupant classification ECU Removal.
(d) Connect the negative (-) terminal cable to the battery.
NEXT -- Continue to next step.
4. PERFORM REGISTRATION AFTER ECU EXCHANGE
(a) Turn the ignition switch to ON.
(b) Using the Techstream, load the previous ECU data stored in the tester into the new ECU Registration.
NEXT -- Continue to next step.
5. PERFORM ZERO POINT CALIBRATION
(a) Using the Techstream, perform zero point calibration Initialization.
NEXT -- Continue to next step.
6. CHECK FOR DTC
HINT: Check that the zero point calibration is completed normally. If one of the following conditions is met, DTC B1797 will be output (refer to INITIALIZATION Initialization):
- Zero point calibration is performed when the conditions for the calibration are not satisfied.
- Zero point calibration has failed.
(a) Clear the DTCs stored in the occupant classification ECU Reading and Clearing Diagnostic Trouble Codes.
(b) Clear the DTCs stored in the center airbag sensor DTC Check / Clear.
(c) Turn the ignition switch to OFF.
(d) Turn the ignition switch to ON.
(e) Check for the DTCs Reading and Clearing Diagnostic Trouble Codes.
OK:
DTC B1797 is not output.
NG -- GO TO DTC B1797
OK -- Continue to next step.
7. PERFORM SENSITIVITY CHECK
(a) Perform the sensitivity check Initialization.
NEXT -- END