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. 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 DTC B1797 may be output at this time, but they are not related to this check.

NG → See step   2 

OK → See step   8 

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 DETECTION:
   
   

   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	-
   Filtered pressure sensor output	Filtered pressure sensor output / Min.: 0, Max.: 255	38 to 240	38 to 75	If value is outside range of Specified Condition for Zero Point Calibration, check whether any objects are placed on seat cushion and that seat cushion is fitted correctly.
   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, adjust temperature to proper range by using air conditioner, etc.
   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 range of specified condition for zero point calibration	A
   "Themi Temp" does not correspond to 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 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. 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 DTC B1797 may be output at this time, but they are not related to this check.

NG → See step   5 

OK → END 

1. Turn the engine switch off.
2. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
3. Replace the front seat set (with occupant classification ECU and occupant detection sensor). Refer to DISASSEMBLY .
4. Connect the negative (-) terminal cable to the battery.
5. Turn the engine switch on (IG).
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. Refer to REMOVAL .

NEXT: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Using the Techstream, perform 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