Toyota Corolla Cross: Initialization

INITIALIZATION

DESCRIPTION

(a) Zero point of the occupant classification sensors may deviate in the following situations. To ensure sensor accuracy, be sure to perform Occupant Detection Sensor Zero Point Calibration.

1. The airbag ECU assembly is replaced.

   HINT:

   As the zero point is not automatically stored in a new airbag ECU assembly, it is necessary to perform zero point calibration after replacing the airbag ECU assembly.

2. Accessories (seatback tray, seat cover, etc.) are installed or removed.

   HINT:

   As the weight of accessories will be added or decreased to the weight of the occupant, the system will not be able to perform classification accurately.

3. The front passenger seat is removed from the vehicle.

   HINT:

   As the seat frame will warp slightly when the bolts that are used to install the front passenger seat are tightened, the load applied to the occupant classification sensors will change and the system will not be able to perform classification accurately.

4. Any of the bolts that are used to install the front passenger seat are removed and reinstalled.

   HINT:

   As the seat frame will warp slightly when the bolts that are used to install the front passenger seat are tightened, the load applied to the occupant classification sensor will change and the system will not be able to perform classification accurately.

5. The passenger airbag ON indicator illuminates when the front passenger seat is not occupied or the passenger airbag OFF indicator illuminates when the front passenger seat is occupied (by an adult).

   HINT:

   If any load or pressure is applied to the occupant classification sensors, the system will not be able to perform classification accurately.

6. An occupant classification sensor collision detection DTC is output due to an accident or a collision.

   HINT:

   If the seat frame or vehicle floor has become deformed and additional pressure is applied to the occupant classification sensor, the system will not be able to perform classification accurately.

NOTICE:

Make sure that the front passenger seat is not occupied before performing the operation.

ZERO POINT CALIBRATION

(a) Zero point calibration procedure

(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.
• No objects are touching the front passenger seat.

(2) Adjust the seat position according to the table below.

(3) Perform zero point calibration by following the prompts on the GTS screen.

OK:

"Occupant Detection Sensor Zero Point Calibration is complete." is displayed.

(4) Clear the Vehicle Control History (RoB).

(5) Check for Vehicle Control History (RoB).

OK:

X20D0 is not output.

HINT:

• Refer to the GTS operator's manual for further details.
• If Occupant Detection Sensor Zero Point Calibration does not complete normally, check the Error Code List to determine the cause of malfunction. Error Code List

  Error Code	Item Name	Cause	Countermeasure
  01	Out of FI Load Sensor Upper Limit Standard	When any of the following conditions is detected: The sensor load value before learning is not as specified (upper limit exceeded) The sensor load value after learning is not as specified (upper limit exceeded)	Check for the following Check whether the vehicle and seat are subject to vibration or a load. Check front seat assembly RH installation. Click here Perform Occupant Detection Sensor Zero Point Calibration again. HINT: If the error code is output again, replace the front occupant classification sensor LH (Front Seat Cushion Spring Sub-assembly RH). Click here
  02	Out of FI Load Sensor Lower Limit Standard	When any of the following conditions is detected: The sensor load value before learning is not as specified (below lower limit) The sensor load value after learning is not as specified (below lower limit)	Check for the following Check whether the vehicle and seat are subject to vibration or a load. Check front seat assembly RH installation. Click here Perform Occupant Detection Sensor Zero Point Calibration again. HINT: If the error code is output again, replace the front occupant classification sensor LH (Front Seat Cushion Spring Sub-assembly RH). Click here
  03	Out of RI Load Sensor Upper Limit Standard	When any of the following conditions is detected: The sensor load value before learning is not as specified (upper limit exceeded) The sensor load value after learning is not as specified (upper limit exceeded)	Check for the following Check whether the vehicle and seat are subject to vibration or a load. Check front seat assembly RH installation. Click here Perform Occupant Detection Sensor Zero Point Calibration again. HINT: If the error code is output again, replace the rear occupant classification sensor LH (Front Seat Cushion Spring Sub-assembly RH). Click here
  04	Out of RI Load Sensor Lower Limit Standard	When any of the following conditions is detected: The sensor load value before learning is not as specified (below lower limit) The sensor load value after learning is not as specified (below lower limit)	Check for the following Check whether the vehicle and seat are subject to vibration or a load. Check front seat assembly RH installation. Click here Perform Occupant Detection Sensor Zero Point Calibration again. HINT: If the error code is output again, replace the rear occupant classification sensor LH (Front Seat Cushion Spring Sub-assembly RH). Click here
  10	Nonvolatile Memory Storage Failure	When a memory malfunction caused by either of the following is detected: Writing failure IGR low voltage (below 8 V)	Check for the following Check for DTCs. Click here Check vehicle control history (RoB). Click here Measure IGR terminal voltage. Click here HINT: If below 8 V, check the power source circuit. Perform Occupant Detection Sensor Zero Point Calibration again. HINT: If the error code is output again, replace the airbag sensor assembly. Click here
  11	Zero Point Learning Timeout	Occupant Detection Sensor Zero Point Calibration does not complete within 2 seconds (within the specified number of seconds)	Check for the following Clear the vehicle control history (RoB). Click here Check vehicle control history (RoB). Click here Check whether the vehicle and seat are subject to vibration or a load. Check front seat assembly RH installation. Click here Perform Occupant Detection Sensor Zero Point Calibration again. HINT: If the error code is output again, replace the airbag ECU assembly. Click here
  13	FI Load Sensor Malfunction	When a load sensor malfunction is detected	Check for the following Check for DTCs. Click here Perform Occupant Detection Sensor Zero Point Calibration again. HINT: If the error code is output again, replace the front occupant classification sensor LH (Front Seat Cushion Spring Sub-assembly RH). Click here
  14	RI Load Sensor Malfunction	When a load sensor malfunction is detected	Check for the following Check for DTCs. Click here Perform Occupant Detection Sensor Zero Point Calibration again. HINT: If the error code is output again, replace the rear occupant classification sensor LH (Front Seat Cushion Spring Sub-assembly RH). Click here
  17	FI LIN Communication Lost	When a communication malfunction with the load sensor is detected	Check for the following Check for DTCs. Click here Perform Occupant Detection Sensor Zero Point Calibration again. HINT: If the error code is output again, refer to "LIN Communication Circuit". Click here
  18	RI LIN Communication Lost	When a communication malfunction with the load sensor is detected	Check for the following Check for DTCs. Click here Perform Occupant Detection Sensor Zero Point Calibration again. HINT: If the error code is output again, refer to "LIN Communication Circuit". Click here
  21	ECU Malfunction	When an airbag ECU assembly malfunction is detected	Check for the following Check for DTCs. Click here Perform Occupant Detection Sensor Zero Point Calibration again. HINT: If the error code is output again, replace the airbag ECU assembly. Click here
  22	IGR Voltage Malfunction	When IGR low voltage (below 8 V) is detected	Check for the following Check vehicle control history (RoB). Click here Measure IGR terminal voltage. Click here HINT: If below 8 V or 16 V or higher, check the power source circuit.
  23	Load Unstable	When any of the following conditions is detected: The vehicle and seat are subject to vibration or a load Sensor malfunction	Check for the following Check whether the vehicle and seat are subject to vibration or a load. Perform Occupant Detection Sensor Zero Point Calibration again. HINT: If the error code is output again, replace the Front Seat Cushion Spring Sub-assembly RH. Click here

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