Occupant Classification System (Diagnostics - Introduction): Other Scion tC II рестайлинг

PRECAUTION [05/2013 - 01/2014]

Note. When disconnecting the cable, some systems need to be initialized after the cable is reconnected. Refer to INITIALIZATION [05/2013 - 01/2014] .

HINT

The type of ignition switch used on this model differs according to the specifications of the vehicle. The expressions listed in the table below are used in this Service Information.

1. INSPECTION PROCEDURE FOR VEHICLE INVOLVED IN ACCIDENT Perform the zero point calibration and sensitivity check if any of the following conditions apply. The occupant classification ECU is replaced. Accessories (seatback tray, seat cover, etc.) are installed. The front passenger seat is removed from the vehicle. The passenger airbag ON/OFF indicator ("OFF") comes on when the front passenger seat is not occupied. The vehicle is brought to the workshop for repair due to an accident or collision. NOTE: When a vehicle that has been in an accident is brought into the workshop for repair, check the flatness of the body on the side that is equipped with the passenger seat. If the flatness is not within +/-3.0 mm (0.118 in.) of the specification, adjust it to a value within the specified range.

PRECAUTION [01/2014 - ]

Note. When disconnecting the cable, some systems need to be initialized after the cable is reconnected. Refer to INITIALIZATION [01/2014 - ] .

HINT

The type of ignition switch used on this model differs according to the specifications of the vehicle. The expressions listed in the table below are used in this Service Information.

1. INSPECTION PROCEDURE FOR VEHICLE INVOLVED IN ACCIDENT Perform the zero point calibration and sensitivity check if any of the following conditions apply. The occupant classification ECU is replaced. Accessories (seatback tray, seat cover, etc.) are installed. The front passenger seat is removed from the vehicle. The passenger airbag ON/OFF indicator ("OFF") comes on when the front passenger seat is not occupied. The vehicle is brought to the workshop for repair due to an accident or collision. NOTE: When a vehicle that has been in an accident is brought into the workshop for repair, check the flatness of the body on the side that is equipped with the passenger seat. If the flatness is not within +/-3.0 mm (0.118 in.) of the specification, adjust it to a value within the specified range.

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1. DESCRIPTION OF OCCUPANT CLASSIFICATION SYSTEM GENERAL DESCRIPTION In the occupant classification system, the occupant classification ECU calculates the weight of the occupant based on signals from the occupant classification sensors. This system recognizes the occupant to be a child if it detects a weight of less than 36 kg (79.4 lb), and disables the front passenger airbag assembly and side airbag (front passenger side). This system is mainly comprised of 4 occupant classification sensors that detect the load on the front passenger seat. The occupant classification ECU controls the system, and the passenger airbag ON/OFF indicator indicates the on/off status of the front passenger airbag and side airbag (front passenger side). OCCUPANT CLASSIFICATION SENSOR The occupant classification sensors are installed on 4 brackets connecting the seat rail and seat frame. Accordingly, when load is applied to the front passenger seat by an occupant sitting in it, the occupant classification sensors register a distortion. DESCRIPTION FOR PASSENGER AIRBAG ON/OFF INDICATOR The passenger airbag ON/OFF indicator is installed on the clock. This indicator informs the driver whether the occupant classification ECU will enable or disable the front passenger airbag assembly and side airbag (front passenger side). If a malfunction occurs in the occupant classification system, the passenger airbag ON/OFF indicator ("OFF") and SRS warning light will come on.

INITIALIZATION [05/2013 - ]

1. ZERO POINT CALIBRATION NOTE: Make sure that the front passenger seat is not occupied before performing the operation. HINT: Perform the zero point calibration and sensitivity check if any of the following conditions apply. The occupant classification ECU is replaced. Accessories (seatback tray, seat cover, etc.) are installed. The front passenger seat is removed from the vehicle. The passenger airbag ON/OFF indicator ("OFF") comes on when the front passenger seat is not occupied. The vehicle is brought to the workshop for repair due to an accident or collision. Zero point calibration and sensitivity check procedures HINT: Make sure that zero point calibration has finished normally before performing the sensitivity check. Adjust the seat position according to the table below. Adjustment Component Position Slide Direction Rearmost position Reclining Angle Upright position Headrest Height Lowest position Lifter Height Lowest position Connect the Techstream to the DLC3. Turn the ignition switch to ON. Perform the zero point calibration by following the prompts on the screen. HINT: Refer to the Techstream operator's manual for further details. OK "Zero Point Calibration is complete." is displayed. Perform the sensitivity check by following the prompts on the screen. Confirm that the beginning sensor reading is within the standard range. Standard -3.2 to 3.2 kg (-7.0 to 7.0 lb) Place a 30 kg (66.1 lb) weight (e.g. a 30 kg [66.1 lb] lead weight) onto the front passenger seat. Confirm that the sensitivity is within the standard range. Standard 27 to 33 kg (59.5 to 72.8 lb) HINT: When performing the sensitivity check, use a solid metal weight (the check result may not appear properly if a liquid weight is used). If the sensitivity deviates from the standard range, retighten the bolts of the front passenger seat taking care not to deform the seat rail. After performing this procedure, if the sensitivity is not within the standard range, replace the front seat cushion spring assembly RH. If zero point calibration does not finish normally, replace the front seat cushion spring assembly RH.