B1797

SUPPLEMENTAL RESTRAINT SYSTEM: OCCUPANT CLASSIFICATION SYSTEM: B1797: Calibration Malfunction
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 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 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 -- USE SIMULATION METHOD TO CHECK Diagnosis System
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 engine switch on (IG).

(c) Using the Techstream, read the DATA LIST Scan Tool Testing and Procedures.

Occupant classification ECU:





Result:





B -- REPLACE FRONT SEAT CUSHION ASSEMBLY RH (OCCUPANT CLASSIFICATION SENSOR)
A -- 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 the 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, past DTCs will remain.

NEXT -- Continue to next step.

4. 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 assembly Reading and Clearing Diagnostic Trouble Codes.

(d) Turn the engine switch off.

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

(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 -- USE SIMULATION METHOD TO CHECK Diagnosis System
NG -- Continue to next step.

5. REPLACE FRONT SEAT CUSHION ASSEMBLY RH (OCCUPANT CLASSIFICATION SENSOR)

(a) Turn the engine switch off.

(b) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.

(c) Front seat (for power seat)

(1) Replace the front seat cushion (with occupant classification ECU and occupant detection sensor) Disassembly.

(d) Front seat (for manual seat)

(1) Replace the front seat cushion (with occupant classification ECU and occupant detection sensor) Disassembly.

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

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

(g) Clear the DTCs stored in the occupant classification ECU Reading and Clearing Diagnostic Trouble Codes.

(h) Clear the DTCs stored in the center airbag sensor assembly Reading and Clearing Diagnostic Trouble Codes.

NEXT -- Continue to next step.

6. PERFORM ZERO POINT CALIBRATION

(a) Connect the Techstream to the DLC3.

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

(c) Using the Techstream, perform the 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.

7. PERFORM SENSITIVITY CHECK

(a) Perform the sensitivity check Initialization.

NEXT -- END