Occupant Classification System (Diagnostics - Introduction): Other Toyota Venza I

PRECAUTION

1. PRECAUTION FOR DISCONNECTING THE BATTERY CABLE NOTE: When disconnecting the cable from the negative (-) battery terminal, initialize the following systems after the cable is reconnected. System Name See Procedure Back Door Closer System Refer to «INITIALIZATION»(ref-394610-S11154682782011040800000) Power Back Door System
2. INSPECTION PROCEDURE FOR VEHICLE INVOLVED IN ACCIDENT Perform zero point calibration and sensitivity check if any of the following conditions occur: The occupant classification ECU is replaced. Accessories (seatback tray and 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 an accident vehicle is brought into the workshop for repair, check the flatness of the body side that is equipped with the passenger seat. If the flatness is not within +/- 3.0 mm (0.118 in.), adjust it to the specified range.
3. EXPRESSIONS OF IGNITION SWITCH 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 information. Expression Switch Type Ignition Switch (Position) Engine Switch (Condition) Ignition switch off LOCK Off Ignition switch ON ON On (IG) Ignition switch ACC ACC On (ACC) Engine Start START Start

Scheme 52

Scheme 53

Scheme 54

Scheme 55

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 as a child if it detects a weight of less than 32 kg (70.6 lb), and disables the front passenger airbag and front passenger side knee airbag. 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 condition of the front passenger airbag and front passenger side knee airbag. 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 This indicator informs the driver whether the occupant classification ECU puts the front passenger airbag and front passenger side knee airbag into an active state or inactive state. If a malfunction occurs in the occupant classification system, the passenger airbag ON/OFF indicator ("OFF") and the SRS warning light come on.

INITIALIZATION

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

HINT

Perform zero point calibration and sensitivity check if any of the following conditions occur

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 procedure HINT: Make sure that the zero point calibration has finished normally, and then perform 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 passenger seat. The front passenger seat belt buckle switch is off. Adjust the seat position according to the table below. Adjustment Item Position Slide Direction Rearmost position Reclining Angle Upright position Headrest Height Lowest position Turn the ignition switch off. Connect the Techstream to the DLC3. Turn the ignition switch to ON and turn the Techstream on. Enter the following menus: Body Electrical / Occupant Detection / Utility / Zero Point Calibration. Perform zero point calibration by following the prompts on the Techstream screen. HINT: Refer to the Techstream operator's manual for further details. If zero point calibration does not complete, replace the front seat assembly RH. OK "Zero Point Calibration is complete." is displayed.
2. SENSITIVITY CHECK Sensitivity check procedure Turn the ignition switch off. Connect the Techstream to the DLC3. Turn the ignition switch to ON and turn the Techstream on. Enter the following menus: Body Electrical / Occupant Detection / Utility / Sensitivity Check. Perform sensitivity check by following the prompts on the Techstream screen. HINT: Refer to the Techstream operator's manual for further details. Confirm that the initial sensor reading is within the specified range. Standard -3.2 to 3.2 kg (-7.0 to 7.0 lb) Place a 30 kg (66.1 lb) weight (eg. a 30 kg (66.1 lb) of lead mass) onto the front passenger seat. Confirm that sensitivity is within the specified range. Standard 27 to 33 kg (59.5 to 72.8 lb) HINT: When performing sensitivity check, use a solid metal weight (the check result may not appear properly if a liquid weight made from liquid is used). If sensitivity deviates from the specified range, retighten the bolts of the front passenger seat without deforming the seat rail. After performing this procedure, if sensitivity is not within the specified range, replace the front seat assembly RH.

FAIL-SAFE CHART

1. FAIL SAFE FUNCTION The following chart shows the status of the controls when the system is normal and malfunctioning. The passenger airbag ON/OFF indicator ("ON" and "OFF") comes on for approximately 4 seconds, then goes off for approximately 2 seconds. Approximately 6 seconds after the ignition switch is turned to ON, the passenger airbag ON/OFF indicator will show ON or OFF depending on the conditions listed below. Condition ON Indicator OFF Indicator Front Passenger Airbag Front Passenger Side Knee Airbag Front Seat Side Airbag RH Front Seat Belt Pretensioner RH Curtain Shield Airbag RH Adult is seated ON OFF o o o o o Child is seated OFF ON - - o o o Vacant OFF OFF - - o - o Failure OFF ON - - o o o HINT: o: Deployable -: Not deployable