Occupant Classification System (Diagnostics - Introduction): Other Scion xD I

PRECAUTION

1. INSPECTION PROCEDURE FOR VEHICLE INVOLVED IN ACCIDENT Perform the zero point calibration and sensitivity check if any of the following conditions apply. Refer to «INITIALIZATION»(ref-388797-S12360539702011031100000) . The occupant classification ECU is replaced. Accessories (seatback tray and seat cover, etc.) are installed. The front seat RH is removed from the vehicle. The passenger airbag ON/OFF indicator (OFF) comes on when the front seat RH is not occupied. The vehicle is brought to the workshop for repair due to an accident or a collision. NOTE: When a vehicle that has been in an accident is brought into the workshop for repair, check the flatness of the floor where the front seat RH is mounted. If the flatness is not within +/-3.0 mm (0.118 in.), adjust it to the specified range.

Scheme 267

Scheme 268

Scheme 269

1. GENERATION DESCRIPTION The occupant classification system determines whether the front passenger seat is occupied by an adult or child (with child seat) or is unoccupied, based on the load that is applied to the front passenger seat and whether the seat belt is buckled. The system restricts the deployment of the front passenger airbag, front passenger side airbag, and front passenger seat belt pretensioner in accordance with this judgment. The result is informed to the driver through the airbag ON/OFF indicator illumination.
2. SYSTEM CONFIGURATION This system consists of the occupant classification ECU, occupant classification sensors, airbag ON/OFF indicator, passenger side seat belt buckle switches, and center airbag sensor.
3. OCCUPANT CLASSIFICATION SENSOR The occupant classification sensors are installed on 4 brackets, which connect the seat rail and the seat frame. The resistance values of these sensors, which vary in accordance with the load that acts on the brackets, are transmitted to the occupant classification ECU as signals. Upon receipt of the signals, the ECU determines the front passenger seat occupant conditions.

INITIALIZATION

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.

1. The occupant classification ECU is replaced.
2. Accessories (seatback tray and seat cover, etc.) are installed.
3. The front passenger seat is removed from the vehicle.
4. The passenger airbag ON/OFF indicator (OFF) comes on when the front passenger seat is not occupied.
5. The vehicle is brought to the workshop for repair due to an accident or a collision.

1. ZERO POINT CALIBRATION Zero point calibration procedures: HINT: Make sure that the zero point calibration has finished normally, and then perform the sensitivity check. Check that all of the following conditions are met: The vehicle is parked on a level surface. No objects are placed on the front seat RH. The front seat inner belt RH (passenger side buckle switch) is off. Adjust the seat position in accordance with the table below. Adjustment Item Position Slide Direction Rearmost position Reclining Angle Upright position Headrest Height Lowest position Lifter Height Lowest position Connect a Techstream to the DLC3. Turn the ignition switch ON. Perform the zero point calibration by following the prompts on the tester screen. HINT: Refer to the Techstream operator's manual for further details. If the zero point calibration has not finished normally, replace the front seat RH.
2. SENSITIVITY CHECK Sensitivity check procedures: Connect a Techstream to the DLC3. Turn the ignition switch ON. Perform the sensitivity check by following the prompts on the tester screen. HINT: Refer to the Techstream operator's manual for further details. Confirm that the beginning sensor reading is within the standard range. Standard range -3.2 to 3.2 kg (-7.0 to 7.0 lb) Place a 30 kg (66.2 lb) weight onto the front passenger seat. Confirm that the sensitivity is within the standard range. Standard range 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 be accurate if a liquid weight is used). If the sensitivity deviates from the standard range, retighten the bolts of the front seat RH 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 RH.