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 due to 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 level 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.
         SEAT POSITION
         
         

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

      3. Connect the intelligent tester (with CAN VIM) to the DLC3.
         Fig 1: Connecting Intelligent Tester To DLC3

         Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      4. Turn the engine switch on (IG).
      5. Perform the zero point calibration by following the prompts on the tester screen.

         HINT:

         • Refer to the intelligent tester 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.
         Fig 2: Zero Point Calibration Procedure Chart

         Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

         HINT:

         *1: If After Exchange is selected before the previous ECU data are stored in the intelligent tester, the display screen returns to CONDITION SELECT ECU: Occupant Detect.

         DTC ITEM REFERENCE CHART
         
         

         Item	Procedure
         DTC	Perform DTC check and repair
         Write error	Replace front seat cushion assembly (with occupant classification ECU and occupant detection 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 engine switch off.
      2. Place a weight of 20 kg (44.0 lb) 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 engine switch on (IG), and wait for at least 6 seconds.
         Fig 3: Identifying Weight On Front Passenger Seat

         Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      4. Check that the passenger airbag ON/OFF indicator indicates OFF.

         OK: Passenger airbag ON/OFF indicator indicates OFF. 

      5. Add a weight of 30 kg (66.1 lb) 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: Passenger airbag ON/OFF indicator indicates ON.