DTC B1797: Calibration Malfunction: Procedure

1. Turn the engine switch on (IG).
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 engine switch off.
5. Turn the engine switch on (IG), and wait for at least 10 seconds.
6. Check for the 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.

OK → See step   8 

NG: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Using the Techstream, read the DATA LIST. Refer to DATA LIST / ACTIVE TEST .
   OCCUPANT CLASSIFICATION ECU:
   
   

   Tester Display	Measurement Item/ Range	Normal Condition	Specified Condition for Zero Point Calibration	Diagnostic Note
   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 (36 to 104°F)	If value is outside range of Specified Condition for Zero Point Calibration, check whether any objects placed on seat cushion and that seat cushion fitted correctly
   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 Temperature Output does not correspond to the range of specified condition for zero point calibration	B

B → See step   5 

A: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Using the Techstream, perform the zero point calibration. Refer to INITIALIZATION .
4. Turn the engine switch off.
5. Turn the engine switch on (IG).
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 engine switch on (IG).
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 engine switch off.
5. Turn the engine switch on (IG).
6. Check for the 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.

OK → See step   8 

NG: Go to next step 

1. Turn the engine switch off.
2. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
3. Front seat (for power seat)
   1. Replace the front seat cushion (with occupant classification ECU and occupant detection sensor). Refer to DISASSEMBLY .
4. Front seat (for manual seat)
   1. Replace the front seat cushion (with occupant classification ECU and occupant detection sensor). Refer to DISASSEMBLY .
5. Connect the negative (-) terminal cable to the battery.
6. Turn the engine switch on (IG).
7. Clear the DTCs stored in the occupant classification ECU. Refer to DTC CHECK / CLEAR .
8. Clear the DTCs stored in the center airbag sensor assembly. Refer to DTC CHECK / CLEAR .

NEXT: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Using the Techstream, perform the zero point calibration. Refer to INITIALIZATION .
4. Turn the engine switch off.
5. Turn the engine switch on (IG).
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. Perform the sensitivity check. Refer to INITIALIZATION .

NEXT → END