Inspection Procedure

HINT:

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

1. CHECK DTC 
   1. Turn the ignition switch to the ON position.
   2. Clear the DTCs stored in memory (See DIAGNOSIS SYSTEM  ).

      HINT:

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

   3. Turn the ignition switch to the LOCK position.
   4. Turn the ignition switch to the ON position.
   5. Check the DTCs (See DIAGNOSIS SYSTEM  ).

      OK: DTC B1793 is not output. 

      HINT:

      Codes other than DTC B1793 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 CONNECTORS 
   1. Turn the ignition switch to the LOCK position.
   2. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
   3. Check that the connectors are properly connected to the occupant classification ECU and the occupant classification sensors.

      OK: The connectors are connected. 

   NG: CONNECT CONNECTORS, THEN GO TO STEP1 

   OK: Go to Next Step 

3. CHECK FLOOR WIRE NO. 2 (SHORT TO B+) 
   1. Disconnect the connectors from the occupant classification ECU and the 4 occupant classification sensors.
   2. Connect the negative (-) terminal cable to the battery.
   3. Turn the ignition switch to the ON position.
   4. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester connection	Condition	Specified condition
      O3-5 (SVC3) - Body ground	Ignition switch ON	Below 1 V
      O3-6 (SVC4) - Body ground	Ignition switch ON	Below 1 V
      O3-11 (SVC1)- Body ground	Ignition switch ON	Below 1 V
      O3-12(SVC2)- Body ground	Ignition switch ON	Below 1 V

      Fig 1: Checking Floor Wire No. 2 (Short To B+)

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPAIR OR REPLACE FLOOR WIRE NO. 2 

   OK: Go to Next Step 

4. CHECK FLOOR WIRE NO. 2 (SHORT TO GROUND) 
   1. Turn the ignition switch to the LOCK position.
   2. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
   3. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester connection	Condition	Specified condition
      O3-5 (SVC3) - Body ground	Always	1 MΩ or higher
      O3-6 (SVC4) - Body ground	Always	1 MΩ or higher
      O3-11(SVC1)- Body ground	Always	1 MΩ or higher
      O3-12 (SVC2)- Body ground	Always	1 MΩ or higher

      Fig 2: Checking Floor Wire No. 2 (Short To Ground)

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPAIR OR REPLACE FLOOR WIRE NO. 2 

   OK: Go to Next Step 

5. CHECK FLOOR WIRE NO. 2 (OPEN) 
   1. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester connection	Condition	Specified condition
      O3-5 (SVC3) -O6-1 (SVC3)	Always	Below 1 Ω
      O3-6 (SVC4) -O7-1 (SVC4)	Always	Below 1 Ω
      O3-11 (SVC1) -O4-1 (SVC1)	Always	Below 1 Ω
      O3-12 (SVC2)-O5-1 (SVC2)	Always	Below 1 Ω

      Fig 3: Checking Floor Wire No. 2 (Open)

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPAIR OR REPLACE FLOOR WIRE NO. 2 

   OK: Go to Next Step 

6. CHECK FLOOR WIRE NO. 2 (SHORT) 
   1. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester connection	Condition	Specified condition
      O3-5 (SVC3) -O3-6 (SVC4)	Always	1 MΩ or higher
      O3-6 (SVC4) -O3-11 (SVC1)	Always	1 MΩ or higher
      O3-11 (SVC1) -O3-12(SVC2)	Always	1 MΩ or higher
      O3-12(SVC2)-O3-5 (SVC3)	Always	1 MΩ or higher
      O3-12 (SVC2)-O3-6 (SVC4)	Always	1 MΩ or higher
      O3-11 (SVC1) -O3-5 (SVC3)	Always	1 MΩ or higher

      Fig 4: Checking Floor Wire No. 2 (Short)

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPAIR OR REPLACE FLOOR WIRE NO. 2 

   OK: Go to Next Step 

7. CHECK DTC 
   1. Connect the connectors to the occupant classification ECU and the 4 occupant classification sensors.
   2. Connect the negative (-) terminal cable to the battery.
   3. Turn the ignition switch to the ON position.
   4. Clear the DTCs stored in memory (See DIAGNOSIS SYSTEM  ).

      HINT:

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

   5. Turn the ignition switch to the LOCK position.
   6. Turn the ignition switch to the ON position.
   7. Check the DTCs (See DIAGNOSIS SYSTEM  ).

      OK: DTC B1793 is not output. 

      HINT:

      Codes other than DTC B1793 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 to the LOCK position.
   2. Disconnect the negative (-) terminal cable from the battery.
   3. Replace the occupant classification ECU (See ON-VEHICLE INSPECTION  ).

      HINT:

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

9. PERFORM ZERO POINT CALIBRATION 
   1. Connect the negative (-) terminal cable to the battery.
   2. Connect the intelligent tester to the DLC3.
   3. Turn the ignition switch to the ON position.
   4. Using the intelligent tester, perform "Zero point calibration" (See INITIALIZATION  ).

      OK: The "COMPLETED" is displayed. 

   NG: Go to step  12

   OK: Go to Next Step 

10. PERFORM SENSITIVITY CHECK 
    1. Using the intelligent tester, perform "Sensitivity check" (See INITIALIZATION  ).

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

    NG: Go to step  12

    OK: Go to Next Step 

11. CHECK DTC 
    1. Connect the negative (-) terminal cable to the battery.
    2. Turn the ignition switch to the ON position.
    3. Clear the DTCs stored in memory (See DIAGNOSIS SYSTEM  ).

       HINT:

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

    4. Turn the ignition switch to the LOCK position.
    5. Turn the ignition switch to the ON position.
    6. Check the DTCs (See DIAGNOSIS SYSTEM  ).

       OK: DTC B1793 is not output. 

       HINT:

       Codes other than DTC B1793 may be output at this time, but they are related to this check.

    OK: END 

    NG: Go to Next Step 

12. REPLACE FRONT SEAT ASSEMBLY RH 
    1. Turn the ignition switch to the LOCK position.
    2. Disconnect the negative (-) terminal cable from the battery.
    3. Replace the front seat assembly RH (See REMOVAL - MANUAL or REMOVAL - POWER ).
13. PERFORM ZERO POINT CALIBRATION 
    1. Connect the negative (-) terminal cable to the battery.
    2. Connect the intelligent tester to the DLC3.
    3. Turn the ignition switch to the ON position.
    4. Using the intelligent tester, perform "Zero point calibration" (See INITIALIZATION  ).

       OK: The "COMPLETED" is displayed. 

14. PERFORM SENSITIVITY CHECK 
    1. Using the intelligent tester, perform "Sensitivity check" (See INITIALIZATION  ).

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

    NEXT: END