Occupant Classification System (Diagnostics - Introduction): Other Toyota Matrix E140

PRECAUTION

1. INSPECTION PROCEDURE FOR VEHICLE INVOLVED IN ACCIDENT Perform zero point calibration and sensitivity check if any of the following conditions are met: The occupant classification ECU is replaced. The passenger airbag ON/OFF indicator indicates OFF when the front passenger seat is not occupied. The vehicle is brought to the workshop for repair after an accident or a collision.

Scheme 5

Scheme 6

Scheme 7

1. GENERAL DESCRIPTION In the occupant classification system, the occupant classification ECU calculates the weight of the front passenger based on a signal from the occupant classification sensor. If this system judges the occupant to be a child, the front passenger airbag and front seat side airbag RH will be disabled. This system is mainly composed of the occupant classification sensor that detects 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 seat side airbag RH.
2. OCCUPANT CLASSIFICATION SENSOR The occupant classification sensor consists of the gel mat and the pressure sensor. When weight is applied to the gel mat, the pressure applied through the silicone to the pressure sensor changes. The pressure sensor converts these changes into voltages and transmits them to the occupant classification ECU. The occupant classification sensor is installed between the seat cushion frame and seat cushion pad. The pressure sensor is installed on the seat frame. The pressure sensor detects the pressure applied to the front passenger seat as a passenger is seated. The occupant classification ECU determines whether the front passenger airbag and front seat side airbag RH should be deployed based on signals from the pressure sensor.
3. SEAT BELT TENSION SENSOR The seat belt tension sensor is installed on the front seat outer belt to detect a CRS (Child Restraint System).

INITIALIZATION

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

HINT

Perform zero point calibration if any of the following conditions is met

1. The occupant classification ECU is replaced.
2. The passenger airbag ON/OFF indicator indicates OFF when the front passenger seat is not occupied.
3. The vehicle is brought to the workshop for repair after an accident or a collision.

Scheme 8

1. ZERO POINT CALIBRATION Zero point calibration procedure Check that all of the following conditions are met: The vehicle is parked on a flat 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 Lifter Height Lowest position Connect the Techstream to the DLC3. Turn the ignition switch to ON. 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 is performed when the calibration conditions are not satisfied, DTC B1797 is output. If zero point calibration has failed, DTC B1797 is output.
2. SENSITIVITY CHECK Sensitivity check procedure Turn the ignition switch off. Place a 20 kg (44.0 lb) weight on the front passenger seat. NOTE: Do not allow the weight to come into contact with the seatback when placing it on the seat cushion. Place the weight in the area shown in the illustration. Turn the ignition switch to ON, and wait for at least 6 seconds. Check that the passenger airbag ON/OFF indicator indicates OFF. OK The passenger airbag ON/OFF indicator indicates OFF. Add a 30 kg (66.1 lb) weight to the front passenger seat (total 50 kg (110.2 lb)). NOTE: Do not allow the weight to come into contact with the seatback when placing it on the seat cushion. Place the weight in the area shown in the illustration. Check that the passenger airbag ON/OFF indicator indicates ON. OK The passenger airbag ON/OFF indicator indicates ON.

FAIL-SAFE CHART

1. FAIL SAFE FUNCTION The following table 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 indicate ON or OFF depending on the conditions listed below. Condition ON Indicator OFF Indicator Front Passenger Airbag Front Seat Side Airbag RH Front Seat Belt Pretensioner RH Curtain Shield Airbag RH Adult is seated ON OFF o o o o Child is seated OFF ON - - o o Vacant OFF OFF - - - o Failure OFF ON - - o o HINT: o: Deployable -: Not deployable