B1797

SUPPLEMENTAL RESTRAINT SYSTEM: OCCUPANT CLASSIFICATION SYSTEM: B1797: Calibration Malfunction

DTC B1797 - Calibration Malfunction

DESCRIPTION

DTC B1797 is output when the following conditions are met:

- Zero point calibration is performed when the conditions for the calibration are not satisfied.

- Zero point calibration has failed.

Condition for the zero point calibration:









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 B1797 is output, perform troubleshooting for the DTC.

INSPECTION PROCEDURE

PROCEDURE

1. CHECK FOR DTC
(a) Turn the ignition switch 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 Removal.
(d) Turn the ignition switch OFF.
(e) Turn the ignition switch ON, and wait for at least 10 seconds.
(f) Check for the DTCs Reading and Clearing Diagnostic Trouble Codes.
OK:
DTC B1797 is not output.
HINT: Codes other than B1797 may be output at this time, but they are not related to this check.

OK -- PERFORM ZERO POINT CALIBRATION
NG -- Continue to next step.
2. READ VALUE USING DATA LIST (SPECIFIED CONDITION FOR ZERO POINT CALIBRATION)
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch ON.
(c) Using the Techstream, read the Data List Scan Tool Testing and Procedures.

Occupant classification ECU:





Result:





B -- REPLACE OCCUPANT CLASSIFICATION SENSOR (FRONT SEAT CUSHION ASSEMBLY)
A -- Continue to next step.
3. CHECK FOR DTC
HINT: Check that the zero point calibration is completed normally. If any of the following condition is met, DTC B1797 will be output (refer to INITIALIZATION: Initialization).
- Zero point calibration is performed when the calibration conditions are not satisfied.
- Zero point calibration has failed.
(a) Turn the ignition switch 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 Reading and Clearing Diagnostic Trouble Codes.
(d) Turn the ignition switch OFF.
(e) Turn the ignition switch ON.
(f) Check for the DTCs Reading and Clearing Diagnostic Trouble Codes.
OK:
DTC B1797 is not output.
NEXT -- Continue to next step.
4. PERFORM ZERO POINT CALIBRATION
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch ON.
(c) Using the Techstream, perform the zero point calibration Initialization.
(d) Turn the ignition switch OFF.
(e) Turn the ignition switch ON.
(f) Clear the DTCs stored in the memory 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.
5. CHECK FOR DTC
(a) Turn the ignition switch 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 Removal.
(d) Turn the ignition switch OFF.
(e) Turn the ignition switch ON.
(f) Check for the DTCs Reading and Clearing Diagnostic Trouble Codes.
OK:
DTC B1797 is not output.
HINT: Codes other than B1797 may be output at this time, but they are not related to this check.

NEXT -- END
6. REPLACE OCCUPANT CLASSIFICATION SENSOR (FRONT SEAT CUSHION ASSEMBLY)
(a) Turn the ignition switch OFF.
(b) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(c) Replace the front seat cushion (with occupant classification ECU and occupant classification sensor) Disassembly.
(d) Connect the negative (-) terminal cable to the battery.
(e) Turn the ignition switch ON.
(f) Clear the DTCs stored in the occupant classification ECU Reading and Clearing Diagnostic Trouble Codes.
(g) Clear the DTCs stored in the center airbag sensor Removal.
(h) Turn the ignition switch OFF.
(i) Turn the ignition switch ON.
(j) Using the Techstream, check for the DTCs of the occupant classification ECU Reading and Clearing Diagnostic Trouble Codes.
OK:
DTC is not output.
NEXT -- Continue to next step.
7. PERFORM ZERO POINT CALIBRATION
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch ON.
(c) Using the Techstream, perform the zero point calibration Initialization.
(d) Turn the ignition switch OFF.
(e) Turn the ignition switch ON.
(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.
8. CHECK FOR DTC
(a) Turn the ignition switch 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 Removal.
(d) Turn the ignition switch OFF.
(e) Turn the ignition switch ON.
(f) Check for the DTCs Reading and Clearing Diagnostic Trouble Codes.
OK:
DTC B1797 is not output.
NEXT -- Continue to next step.
9. PERFORM SENSITIVITY CHECK
(a) Perform the sensitivity check Initialization.
NEXT -- END