B1797

SUPPLEMENTAL RESTRAINT SYSTEM: OCCUPANT CLASSIFICATION SYSTEM (for Bench Seat Type): B1797: Calibration Malfunction
B1797 - Calibration Malfunction

DESCRIPTION

* DTC B1797 is output when the following condition is 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 supplemental restraint system, check the DTCs stored in the occupant classification ECU. When DTC B1797 is output, perform troubleshooting for the DTC.
* Use the Techstream to check for DTCs of the occupant classification ECU, otherwise the DTC cannot be read.

INSPECTION PROCEDURE

PROCEDURE

1. CHECK DTC

(a) Turn the ignition switch to the ON position.

(b) Clear the DTCs stored in the memory Occupant Classification System (for Bench Seat Type).

HINT
First clear DTCs stored in the occupant classification ECU and then in the center airbag sensor assembly.

(c) Turn the ignition switch to the LOCK position.

(d) Turn the ignition switch to the ON position, and wait for at least 10 seconds.

(e) Check the DTCs Occupant Classification System (for Bench Seat Type).

OK:

DTC B1797 is output.

HINT
DTCs other than B1797 may be output at this time, but they are not related to this check.

NO -- END
YES -- 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 position.

(c) Using the Techstream, read the Data List Occupant Classification System (for Bench Seat Type).

Occupant Detection:





RESULT:





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

3. CHECK DTC

HINT
Check that the zero point calibration is completed normally. If either 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 to the ON position.

(b) Clear the DTCs stored in the memory Occupant Classification System (for Bench Seat Type).

HINT
First clear DTCs stored in the occupant classification ECU and then in the center airbag sensor assembly.

(c) Turn the ignition switch to the LOCK position.

(d) Turn the ignition switch to the ON position.

(e) Check the DTCs Occupant Classification System (for Bench Seat Type).

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 to the ON position.

(c) Using the Techstream, perform the zero point calibration Initialization.

(d) Turn the ignition switch to the OFF position.

(e) Turn the ignition switch to the ON position.

(f) Clear the DTCs stored in the memory Occupant Classification System (for Bench Seat Type).

HINT
If DTC is not cleared at this time, past DTC will remain.

NEXT -- Continue to next step.

5. CHECK DTC

(a) Turn the ignition switch to the ON position.

(b) Clear the DTCs stored in the memory Occupant Classification System (for Bench Seat Type).

HINT
First clear DTCs stored in the occupant classification ECU and then in the center airbag sensor assembly.

(c) Turn the ignition switch to the LOCK position.

(d) Turn the ignition switch to the ON position.

(e) Check the DTCs Occupant Classification System (for Bench Seat Type).

OK:

DTC B1797 is not output.

HINT
DTCs other than B1797 may be output at this time, but they are not related to this check.

NEXT -- END

6. REPLACE FRONT SEAT CUSHION ASSEMBLY (WITH OCCUPANT CLASSIFICATION SENSOR AND SENSOR)

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

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

(e) Turn the ignition switch to the ON position.

(f) Clear the DTCs stored in the memory Occupant Classification System (for Bench Seat Type).

HINT
First clear DTCs stored in the occupant classification ECU and then in the center airbag sensor assembly.

(g) Turn the ignition switch to the LOCK position.

(h) Turn the ignition switch to the ON position.

(i) Using the Techstream, check the DTCs of the occupant classification ECU Occupant Classification System (for Bench Seat Type).

OK:

DTC is not output.

NEXT -- END