Inspection Procedure

1. Turn the power switch ON (IG).
2. Clear the DTCs (see DTC CHECK / CLEAR  ).

   HINT:

   First clear DTCs stored in the occupant classification ECU and then in the center airbag sensor.

3. Turn the power switch OFF, and wait for at least 10 seconds.
4. Turn the power switch ON (IG).
5. Check the DTCs (see DTC CHECK / CLEAR  ).

   OK: DTC B1794 is not output. 

   HINT:

   DTCs other than B1794 may be output at this time, but they are not related to this check.

OK: USE SIMULATION METHOD TO CHECK 

NG: Go to Next Step 

1. Turn the power switch OFF.
2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
3. Check that the connectors are properly connected to the occupant classification ECU.

   OK: The connectors are properly connected. 

NG: CONNECT CONNECTOR 

OK: Go to Next Step 

1. Turn the power switch OFF.
2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
3. Disconnect the O4 connector from the occupant classification ECU.
4. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
5. Measure the voltage of the wire harness side connector.

   Standard voltage 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connection	Condition	Specified Condition
   O4-1 (+B) - Body ground	Always	10 to 14 V
   O4-7 (IG) - Body ground	Power switch ON (IG)	10 to 14 V

6. Turn the power switch OFF.
   Fig 1: Checking Wire Harness (Source Voltage)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
7. Measure the resistance of the wire harness side connector.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connection	Specified Condition
   O4-3 (GND) - Body ground	Below 1 Ω

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR (BATTERY - OCCUPANT CLASSIFICATION ECU) 

OK: Go to Next Step 

1. Turn the power switch OFF.
2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
3. Connect the connectors to the occupant classification ECU.
4. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
5. Turn the power switch ON (IG).
6. Clear the DTCs (see DTC CHECK / CLEAR  ).

   HINT:

   First clear DTCs stored in the occupant classification ECU and then in the center airbag sensor.

7. Turn the power switch OFF, and wait for at least 10 seconds.
8. Turn the power switch ON (IG).
9. Using the intelligent tester, check for DTCs of the occupant classification ECU (see TERMINALS OF ECU  ).

   OK: DTC B1794 is not output. 

   HINT:

   DTCs other than B1794 may be output at this time, but they are not related to this check.

OK: USE SIMULATION METHOD TO CHECK 

NG: Go to Next Step 

1. Turn the power switch OFF.
2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
3. Replace the occupant classification ECU.

1. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
2. Connect the intelligent tester (with CAN VIM) to the DLC3.
3. Turn the power switch ON (IG).
4. Using the intelligent tester, perform the zero point calibration (see INITIALIZATION  ).

   OK: COMPLETED is displayed 

1. Using the intelligent tester, perform the sensitivity check (see INITIALIZATION  ).

   Standard value: 27 to 33 kg (59.52 to 72.75 lb) 

NEXT: END