Occupant Classification System: Initialization

HINT:

Perform the zero point calibration if any of the following conditions is met:

• The occupant classification ECU is replaced.
• The passenger airbag ON/OFF indicator indicates OFF when the front passenger seat is not occupied.
• The vehicle is brought to the workshop for repair after an accident or a collision.

1. ZERO POINT CALIBRATION 
   1. Zero point calibration procedures
      1. Check that all of the following conditions are met:
         • The vehicle is parked on a flat surface.
         • No objects are placed on the front passenger seat.
         • The front passenger seat belt buckle switch is OFF.
      2. Adjust the seat position according to the table below.
         ITEM POSITION CHART
         
         

         Adjustment Item	Position
         Slide Direction	Rearmost position
         Reclining Angle	Upright position
         Headrest Height	Lowest position
         Lifter Height	Lowest position

      3. Connect the Techstream to the DLC3.
      4. Turn the ignition switch to ON.
      5. Enter the following menus: Body Electrical / Occupant Detection / Utility / Zero Point Calibration.
      6. Perform the zero point calibration by following the prompts on the Techstream screen.

      HINT:

      • Refer to the Techstream operator's manual for further details.
      • If the zero point calibration is performed when the calibration conditions are not satisfied, DTC B1797 is output.
      • If the zero point calibration has failed, DTC B1797 is output.
      • If After Exchange is selected before the previous ECU data are stored in the Techstream, the display screen returns to CONDITION SELECT ECU: Occupant Detect.
      ITEM POSITION CHART
      
      

      Item	Procedure
      DTC	Perform DTC check and repair
      Write error	Replace front seat cushion assembly (with occupant classification ECU and occupant classification sensor)
      Temperature	Check value of THERMISTOR TEMP in ECU DATA LIST
      Pressure	Check value of FILTERED PRESS in ECU DATA LIST
      Crash counter	-

2. SENSITIVITY CHECK 
   1. Sensitivity check procedures
      1. Turn the ignition switch off.
      2. Place a 20 kg (44.0 lb) weight on the front passenger seat.
         NOTE:

         • Do not allow the weight to come into contact with the seatback when placing it on the seat cushion.
         • Place the weight in the area shown in the illustration.
      3. Turn the ignition switch to ON, and wait for at least 6 seconds.
      4. Check that the passenger airbag ON/OFF indicator indicates OFF.
         Fig 1: Identifying Front Passenger Seat

         Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

         OK: The passenger airbag ON/OFF indicator indicates OFF. 

      5. Add a 30 kg (66.1 lb) weight to the front passenger seat (total 50 kg (110.2 lb)).
         NOTE:

         • Do not allow the weight to come into contact with the seatback when placing it on the seat cushion.
         • Place the weight in the area shown in the illustration.
      6. Check that the passenger airbag ON/OFF indicator indicates ON.

   OK: The passenger airbag ON/OFF indicator indicates ON.