B1797

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

DESCRIPTION

DTC B1797 is stored 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 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 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 assembly Reading and Clearing Diagnostic Trouble Codes.

(d) Turn the engine switch off.

(e) Turn the engine switch on (IG), and wait for at least 10 seconds.

(f) Check for 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.

NG -- READ VALUE USING DATA LIST (SPECIFIED CONDITION FOR ZERO POINT CALIBRATION)

OK -- PERFORM ZERO POINT CALIBRATION Initialization

2. READ VALUE USING DATA LIST (SPECIFIED CONDITION FOR ZERO POINT CALIBRATION)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Using the Techstream, read the Data List Scan Tool Testing and Procedures.





Result:





B -- REPLACE OCCUPANT CLASSIFICATION SENSOR (FRONT SEAT CUSHION ASSEMBLY)
A -- Continue to next step.

3. CHECK DTC

HINT
Check that zero point calibration is completed normally. If any of the following conditions are 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 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 assembly Reading and Clearing Diagnostic Trouble Codes.

(d) Turn the engine switch off.

(e) Turn the engine switch on (IG).

(f) Check for 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 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 memory Reading and Clearing Diagnostic Trouble Codes.

HINT
If the DTCs are not cleared at this time, history DTCs will remain.

NEXT -- Continue to next step.

5. CHECK 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 assembly Reading and Clearing Diagnostic Trouble Codes.

(d) Turn the engine switch off.

(e) Turn the engine switch on (IG).

(f) Check for 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 engine switch off.

(b) Disconnect the cable from the negative (-) battery terminal.

(c) Replace the front seat cushion assembly (with occupant classification ECU and occupant classification sensor) Removal.

(d) Connect the cable to the negative (-) battery terminal.

(e) Turn the engine switch on (IG).

(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 assembly Reading and Clearing Diagnostic Trouble Codes.

(h) Turn the engine switch off.

(i) Turn the engine switch on (IG).

(j) Using the Techstream, check for 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 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, history DTCs will remain.

NEXT -- Continue to next step.

8. CHECK 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 assembly Reading and Clearing Diagnostic Trouble Codes.

(d) Turn the engine switch off.

(e) Turn the engine switch on (IG).

(f) Check for 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