B1795

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

DTC B1795 - Occupant Classification ECU Malfunction

DESCRIPTION

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





HINT: When DTC B1650 is stored 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 it first.

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.

PROCEDURE

1. CHECK FOR DTC
(a) Turn the engine switch on (IG).
(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 engine switch off.
(e) Turn the engine switch on (IG), and wait for at least 10 seconds.
(f) Check for DTCs.
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 -- REPLACE NO. 1 SEAT CUSHION ASSEMBLY (OCCUPANT CLASSIFICATION ECU)
OK -- USE SIMULATION METHOD TO CHECK
2. REPLACE NO. 1 SEAT CUSHION ASSEMBLY (OCCUPANT CLASSIFICATION ECU)
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Using the Techstream, save the ECU data from the ECU which is installed in the vehicle. Registration
(d) Turn the engine switch off.
(e) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
(f) Replace the No. 1 seat cushion (occupant classification ECU).
(g) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
(h) Turn the engine switch on (IG).
(i) Using the Techstream, load the previous ECU data stored in the Techstream into the new ECU. Registration
(j) Turn the engine switch off.
(k) Turn the engine switch on (IG).
(l) Clear the DTCs stored in the memory. Reading and Clearing Diagnostic Trouble Codes
HINT: If DTCs are not cleared at this time, past DTCs will remain.

NEXT -- Continue to next step.
3. PERFORM ZERO POINT CALIBRATION
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Using the Techstream, perform zero point calibration. Initialization
(d) Turn the engine switch off.
(e) Turn the engine switch on (IG).
(f) Clear the DTCs stored in the occupant classification ECU. Reading and Clearing Diagnostic Trouble Codes
HINT: If the DTCs are not cleared at this time, past DTCs will remain.

NEXT -- Continue to next step.
4. PERFORM SENSITIVITY CHECK
(a) Perform the sensitivity check. Initialization
NEXT -- END