Inspection Procedure

HINT:

• If troubleshooting (wire harness inspection) is difficult to perform, remove the front passenger seat installation bolts to see the undersurface of the seat cushion.
• In the above case, hold the seat so that it does not tip over. Holding the seat for a long period of time may cause a problem, such as seat rail deformation. Hold the seat up only for as long as necessary.

1. CHECK FOR DTC 
   1. Turn the ignition switch ON.
   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 ignition switch OFF.
   4. Turn the ignition switch ON.
   5. Check the DTCs (see DTC CHECK / CLEAR  ).

      OK: 

      DTC B1790 is not output. 

      HINT:

      DTCs other than DTC B1790 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 

2. CHECK CONNECTION OF CONNECTOR 
   1. Turn the ignition 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 and the center airbag sensor.

      OK: 

      The connectors are properly connected. 

   NG: CONNECT CONNECTOR 

   OK: Go to next step 

3. CHECK FLOOR WIRE NO. 2 (TO B+) 
   1. Disconnect the connectors from the occupant classification ECU and the center airbag sensor.
      Fig 1: Identifying Floor Wire No. 2 (To B+)

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   2. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
   3. Turn the ignition switch ON.
   4. Measure the voltage of the wire harness side connector.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION
      
      

      Tester Connection	Specified Condition
      L7-16 (FSP+) - Body ground	Below 1 V
      L7-24 (FSP-) - Body ground	Below 1 V

   NG: REPAIR OR REPLACE FLOOR WIRE NO. 2 

   OK: Go to next step 

4. CHECK FLOOR WIRE NO. 2 (FOR OPEN) 
   1. Turn the ignition switch OFF.
   2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
      Fig 2: Identifying Floor Wire No. 2 (For Open)

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   3. Using a service wire, connect terminals L1-8 (FSR+) and L1-4 (FSR-) of connector C.
      NOTE: Do not forcibly insert a service wire into the terminals of the connector when connecting them.
   4. Measure the resistance of the wire harness side connector.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION
      
      

      Tester Connection	Specified Condition
      L7-16 (FSP+) - L7-24 (FSP-)	Below 1 Ω

   NG: REPAIR OR REPLACE FLOOR WIRE NO. 2 

   OK: Go to next step 

5. CHECK FLOOR WIRE NO. 2 (FOR SHORT) 
   1. Disconnect the service wire from connector C.
      Fig 3: Identifying Floor Wire No. 2 (For Short)

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

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION
      
      

      Tester Connection	Specified Condition
      L7-16 (FSP+) - L7-24 (FSP-)	1 MΩ or higher

   NG: REPAIR OR REPLACE FLOOR WIRE NO. 2 

   OK: Go to next step 

6. CHECK FLOOR WIRE NO. 2 (TO GROUND) 
   1. Measure the resistance of the wire harness side connector.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION
      
      

      Tester Connection	Specified Condition
      L7-16 (FSP+) - Body ground	1 MΩ or higher
      L7-24 (FSP-) - Body ground	1 MΩ or higher

   Fig 4: Identifying Floor Wire No. 2 (To Ground)
   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPAIR OR REPLACE FLOOR WIRE NO. 2 

   OK: Go to next step 

7. CHECK FOR DTC 
   1. Connect the connectors to the occupant classification ECU and the center airbag sensor.
   2. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
   3. Turn the ignition switch ON.
   4. Clear the DTCs (see DTC CHECK / CLEAR  ).

      HINT:

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

   5. Turn the ignition switch OFF.
   6. Turn the ignition switch ON.
   7. Check the DTCs (see DTC CHECK / CLEAR  ).

      OK: 

      DTC B1790 is not output. 

      HINT:

      DTCs other than DTC B1790 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 

8. REPLACE OCCUPANT CLASSIFICATION ECU 
   1. Turn the ignition switch OFF.
   2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
   3. Replace the occupant classification ECU (see REMOVAL  ).

      HINT:

      Perform the inspection using parts from a normal vehicle if possible.

9. PERFORM ZERO POINT CALIBRATION 
   1. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
   2. Connect the Techstream to the DLC3.
   3. Turn the ignition switch ON.
   4. Using the Techstream, perform the zero point calibration (see INITIALIZATION  ).

      OK: 

      "Zero Point Calibration is complete." is displayed. 

10. PERFORM SENSITIVITY CHECK 
    1. Using the Techstream, perform the sensitivity check (see INITIALIZATION  ).

       Standard value: 

       27 to 33 kg (59.52 to 72.75 lb) 

11. CHECK FOR DTC 
    1. Turn the ignition switch ON.
    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 ignition switch OFF.
    4. Turn the ignition switch ON.
    5. Check the DTCs (see DTC CHECK / CLEAR  ).

       OK: 

       DTC B1790 is not output. 

       HINT:

       DTCs other than DTC B1790 may be output at this time, but they are not related to this check.

    NG: REPLACE CENTER AIRBAG SENSOR ASSEMBLY 

    OK: END