Inspection Procedure

1. Turn the engine switch on (IG).
2. Clear the DTCs stored in the occupant classification ECU (see DTC CHECK/CLEAR ).
3. Clear the DTCs stored in the center airbag sensor (see 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 (see 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: USE SIMULATION METHOD TO CHECK  (See TERMINALS OF ECU )

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 (see DATA LIST / ACTIVE TEST ).

   Occupant classification ECU: 

   DIAGNOSTIC NOTE
   
   

   Tester Display	Measurement Item/ Range	Normal Condition	Specified Condition for Zero Point Calibration	Diagnostic Note
   RELATIVE PRESS	Pressure sensor output / Min.: 0, Max.: 255	0 to 210 (reference value)	0 to 2	-
   THERMISTOR TEMP	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
   #PRESENT CODES	Number of present trouble codes / Min.: 0, Max.: 255	0	0	-
   #PAST CODES	Number of past trouble codes/Min.: 0, Max.: 255	0	0	-

   Result: 

   RESULT CHART
   
   

   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: Go to 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 (see DTC CHECK/CLEAR ).
4. Turn the engine switch off.
5. Turn the engine switch on (IG).
6. Clear the DTCs stored in the memory (see DTC CHECK/CLEAR ).

   HINT:

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

1. Turn the engine switch on (IG).
2. Clear the DTCs stored in the occupant classification ECU (see DTC CHECK/CLEAR ).
3. Clear the DTCs stored in the center airbag sensor (see DTC CHECK / CLEAR ).
4. Turn the engine switch off.
5. Turn the engine switch on (IG).
6. Check for the DTCs (see 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: USE SIMULATION METHOD TO CHECK  (See TERMINALS OF ECU )

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) (see DISASSEMBLY ).
4. Front seat (for manual seat)
   1. Replace the front seat cushion (with occupant classification ECU and occupant detection sensor) (see 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 (see DTC CHECK/CLEAR ).
8. Clear the DTCs stored in the center airbag sensor (see DTC CHECK / CLEAR ).

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Using the Techstream, perform the zero point calibration (see DTC CHECK/CLEAR ).
4. Turn the engine switch off.
5. Turn the engine switch on (IG).
6. Clear the DTCs stored in the occupant classification ECU (see DTC CHECK/CLEAR ).

   HINT:

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

1. Perform the sensitivity check (see DTC CHECK/CLEAR ).

NEXT: END