Inspection Procedure

HINT:

• If there is an open in the ground circuit (airbag sensor ECU), the airbag sensor ECU outputs DTCs. Perform troubleshooting with the supplemental restraint system. See HOW TO PROCEED WITH TROUBLESHOOTING .

1. INSPECT AIR BAG ECU ASSY 
   1. Disconnect the A23 connector.
   2. Measure the voltage according to the value(s) in the table below.
   Fig 1: Identifying Air Bag ECU Assy A23 Connector Terminals
   Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

   Standard: 

   AIR BAG ECU ASSY - VOLTAGE TABLE
   
   

   Terminal No	Condition	Specified condition
   A23-13 - Body ground	Ignition switch is ON	10 to 14 V

   NG: Go to step 3 

   OK: Go to Next Step 

2. CHECK HARNESS OR CONNECTOR (BETWEEN CLOCK ASSY AND AIRBAG SENSOR ASSY CENTER) 

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: REPLACE CLOCK ASSY (See step 4 on  REPLACEMENT  ) 

3. INSPECT FRONT SEAT INNER BELT ASSY (PASSENGER SIDE) 
   1. Disconnect the B10 connector from the front seat inner belt assy (Passenger Side).
   2. Measure the resistance according to the value(s) in the table below.
   Fig 2: Identifying Front Seat Inner Belt Assy B10 Connector Terminals
   Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

   Standard: 

   FRONT SEAT INNER BELT ASSY (PASSENGER SIDE) - RESISTANCE TABLE
   
   

   Terminal No	Condition	Specified condition
   B10-1 - B10-2	Seat belt is fastened	Below 1 Ω

   NG: REPLACE FRONT SEAT INNER BELT ASSY (PASSENGER SIDE) 

   OK: Go to Next Step 

4. CHECK HARNESS OR CONNECTOR (BETWEEN FRONT SEAT INNER BELT ASSY (PASSENGER SIDE) AND OCCUPANT DETECTION ECU) 

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: Go to Next Step 

5. CHECK HARNESS OR CONNECTOR (BETWEEN OCCUPANT DETECTION ECU AND AIRBAG SENSOR ASSY CENTER) 

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: Go to Next Step 

6. INSPECT OCCUPANT DETECTION ECU 
   1. Measure the resistance according to the value(s) in the table below.
      Fig 3: Identifying Occupant Detection ECU Connector Terminals

      Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

      Standard: 

      OCCUPANT DETECTION ECU - RESISTANCE TABLE
      
      

      Terminal No	Condition	Specified condition
      O4-5(1) - Body ground	Always	Below 1 Ω
      O10-5(2) - Body ground	Always	Below 1 Ω
      (1) TMC Made (2) TMMK Made

   2. Measure the voltage according to the value(s) in the table below.

      Standard: 

   OCCUPANT DETECTION ECU - VOLTAGE TABLE
   
   

   Terminal No	Condition	Specified condition
   O4-8 - Body ground	Seat belt is fastened	8 to 11V
   O10-8 - Body ground	Seat belt is unfastened	3 to 4.5V

   NG: REPLACE OCCUPANT DETECTION ECU 

   OK: GO TO AIRBAG SYSTEM (See  HOW TO PROCEED WITH TROUBLESHOOTING  )