DTC B1797: Calibration Malfunction: Procedure

1. Turn the ignition switch to ON.
2. Clear the DTCs stored in the occupant classification ECU. Refer to DTC CHECK / CLEAR .
3. Clear the DTCs stored in the center airbag sensor assembly. Refer to DTC CHECK / CLEAR .
4. Turn the ignition switch off.
5. Turn the ignition switch to ON, and wait for at least 10 seconds.
6. Check for DTCs. Refer to DTC CHECK / CLEAR .

   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 → See step   2 

OK → See step   10 

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Using the Techstream, read the Data List. Refer to DATA LIST / ACTIVE TEST .

   Tester Display	Measurement Item/Range	Normal Condition	Specified Condition for Zero Point Calibration
   Pressure Sensor Output	Pressure sensor output/ Min.: 0 Max.: 255	0 to 210 (reference value)	0 to 2
   Thermistor Temperature Output	Thermistor temperature output/ Min.: -40°C (-40°F) Max.: 90°C (194°F)	-40 to 85°C (-40 to 185°F)	3 to 40°C (37 to 104°F)
   Number of Present DTC	Number of present trouble codes/ Min.: 0 Max.: 255	0	0
   Number of Past DTC	Number of past trouble codes/ Min.: 0 Max.: 255	0	0

   Result

   Result	Proceed to
   All items correspond to the range of specified condition for zero point calibration.	A
   THERMISTOR TEMP does not correspond to the range of specified condition for zero point calibration.	B

B → See step   6 

A: Go to next step 

HINT: 

Check that the zero point calibration is completed normally. If any of the following conditions is met, DTC B1797 will be output (Refer to Initialization: Refer to INITIALIZATION ).

• Zero point calibration is performed when the calibration conditions are not satisfied.
• Zero point calibration has failed.

1. Turn the ignition switch to ON.
2. Clear the DTCs stored in the occupant classification ECU. Refer to DTC CHECK / CLEAR .
3. Clear the DTCs stored in the center airbag sensor assembly. Refer to DTC CHECK / CLEAR .
4. Turn the ignition switch off.
5. Turn the ignition switch to ON.
6. Check for DTCs. Refer to DTC CHECK / CLEAR .

   OK

   DTC B1797 is not output.

NEXT: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Using the Techstream, perform the zero point calibration. Refer to INITIALIZATION .
4. Turn the ignition switch off.
5. Turn the ignition switch to ON.
6. Clear the DTCs stored in the memory. Refer to DTC CHECK / CLEAR .

   HINT: 

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

NEXT: Go to next step 

1. Turn the ignition switch to ON.
2. Clear the DTCs stored in the occupant classification ECU. Refer to DTC CHECK / CLEAR .
3. Clear the DTCs stored in the center airbag sensor assembly. Refer to DTC CHECK / CLEAR .
4. Turn the ignition switch off.
5. Turn the ignition switch to ON.
6. Check for DTCs. Refer to DTC CHECK / CLEAR .

   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 

1. Turn the ignition switch off.
2. Disconnect the cable from the negative (-) battery terminal.
3. Replace the front seat cushion assembly (with occupant classification ECU and occupant classification sensor). Refer to REMOVAL .
4. Connect the cable to the negative (-) battery terminal.
5. Turn the ignition switch to ON.
6. Clear the DTCs stored in the occupant classification ECU. Refer to DTC CHECK / CLEAR .
7. Clear the DTCs stored in the center airbag sensor assembly. Refer to DTC CHECK / CLEAR .
8. Turn the ignition switch off.
9. Turn the ignition switch to ON.
10. Using the Techstream, check for occupant classification ECU DTCs. Refer to DTC CHECK / CLEAR .

    OK

    DTC is not output.

NEXT: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Using the Techstream, perform the zero point calibration. Refer to INITIALIZATION .
4. Turn the ignition switch off.
5. Turn the ignition switch to ON.
6. Clear the DTCs stored in the occupant classification ECU. Refer to DTC CHECK / CLEAR .

   HINT: 

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

NEXT: Go to next step 

1. Turn the ignition switch to ON.
2. Clear the DTCs stored in the occupant classification ECU. Refer to DTC CHECK / CLEAR .
3. Clear the DTCs stored in the center airbag sensor assembly. Refer to DTC CHECK / CLEAR .
4. Turn the ignition switch off.
5. Turn the ignition switch to ON.
6. Check for DTCs. Refer to DTC CHECK / CLEAR .

   OK

   DTC B1797 is not output.

NEXT: Go to next step 

1. Perform the sensitivity check. Refer to INITIALIZATION .

NEXT → END