Occupant Classification System (Diagnostics - Introduction): Other Toyota RAV4 IV

PRECAUTION

1. IGNITION SWITCH EXPRESSION 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 section. Expression Ignition Switch (position) Engine Switch (condition) Ignition Switch off Off Off Ignition Switch ON ON On (IG) Ignition Switch ACC ACC On (ACC) Engine Start START Start
2. 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 (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 a collision. NOTE: When a vehicle involved in an accident is brought into the workshop for repair, check the flatness of the floor where the front passenger seat is mounted. If the flatness is not within +-3.0 mm (+-0.118 in.), adjust it to the specified range.

Scheme 274

Scheme 275

Scheme 276

1. GENERAL The front passenger occupant classification system judges whether the front passenger seat is occupied or not in accordance with the seat belt buckle status; and whether the seat is occupied by an adult or child (with child seat) in accordance with the load that is applied to the front passenger seat. Thus, when appropriate, it restricts the deployment of the front passenger airbag, front passenger side airbag, and the front passenger seat belt pretensioner. In addition, the system informs the driver of the result of the judgment through the use of the airbag ON/OFF indicator.
2. MAIN COMPONENTS Component Description Occupant Classification Sensor Outputs voltages to occupant classification ECU in accordance with load applied to sensor Occupant Classification ECU Constantly monitors weight of front passenger seat load, and judges occupancy condition in accordance with signals from occupant classification sensors and seat belt buckle switch Passenger Airbag ON/OFF Indicator Passenger airbag ON indicator illuminates when front passenger and front passenger side airbags activated. Airbag OFF indicator illuminates when front passenger and front passenger side airbags deactivated. Seat Belt Buckle Switch Detects whether seat belt is fastened and outputs appropriate signals to occupant classification ECU

INITIALIZATION

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 (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 a collision. Zero point calibration procedures. HINT: Make sure that the zero point calibration has finished normally, and then perform the sensitivity check. 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 the Techstream to the DLC3. Turn the ignition switch to ON. Enter the following menus: Body Electrical / Occupant Detection / Utility / Zero Point Calibration. 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 has not finished normally, replace the front seat with adjuster frame assembly RH. OK "Zero Point Calibration is complete." is displayed.
2. SENSITIVITY CHECK Sensitivity check procedures. Connect the Techstream to the DLC3. Turn the ignition switch to ON. Enter the following menus: Body Electrical / Occupant Detection / Utility / Sensitivity Check. Perform the sensitivity check by following the prompts on the Techstream screen. Confirm that the beginning sensor reading is within the standard range. Standard range -3.2 to 3.2 kg (-7 to 7 lb) Place a 30 kg (66.14 lb) weight (e.g. a lead mass) onto the front passenger seat. Confirm that the sensitivity is within the standard range. Standard range 27 to 33 kg (59.52 to 72.75 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 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 with adjuster frame assembly RH.