Toyota CH-R Service Manual: Precaution

PRECAUTION

GENERAL PRECAUTION

(a) The following conditions may be interpreted as a malfunction even though they are normal operation:

  1. An object is placed on the passenger seat and the system judges that an adult is seated. As the occupant classification system detects and classifies occupants based on weight, the system may detect an object placed on the seat cushion as an adult passenger depending on its weight.
  2. Pressure is applied to the passenger seat and the system judges that an adult is seated. As the occupant classification system detects and classifies occupants based on weight, the system may detect an adult passenger if pressure is applied to the seat cushion by hands, etc.
  3. Illumination of the passenger airbag ON/OFF indicator does not change immediately after a passenger is seated or leaves the vehicle. To prevent the classification judgment from changing when a passenger changes their seating posture, a certain amount of time is required to detect and classify an occupant when the calculated weight changes. Therefore, there will be a time lag between when a passenger is seated or leaves the vehicle and when the system detects the occupant.

(b) Zero point of the occupant classification sensors may deviate in the following situations. To ensure sensor accuracy, be sure to perform Zero Point Calibration.

  1. The occupant detection ECU is replaced.

    HINT:

    As the zero point is not automatically stored in a new occupant detection ECU, it is necessary to perform zero point calibration after replacing the occupant detection ECU.

  2. Accessories (seatback tray, seat cover, etc.) are installed.

    HINT:

    As the weight of accessories will be added to the weight of the occupant, the system will not be able to perform classification accurately.

  3. The front passenger seat is removed from the vehicle.

    HINT:

    As the seat frame will warp slightly when the bolts that are used to install the front passenger seat are tightened, the load applied to the occupant classification sensor will change and the system will not be able to perform classification accurately.

  4. Any of the bolts that are used to install the front passenger seat are removed and reinstalled.

    HINT:

    As the seat frame will warp slightly when the bolts that are used to install the front passenger seat are tightened, the load applied to the occupant classification sensor will change and the system will not be able to perform classification accurately.

  5. The passenger airbag ON/OFF indicator ("ON") illuminates when the front passenger seat is not occupied.

    HINT:

    If any load or pressure is applied to the occupant classification sensors, the system will not be able to perform classification accurately.

  6. A occupant classification sensor collision detection DTC is output due to an accident or a collision.

IGNITION SWITCH EXPRESSIONS

(a) The type of ignition switch used on this model differs according to the specification 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

LOCK

Off (Lock)

Ignition Switch ACC

ACC

On (ACC)

Ignition Switch ON

ON

On (IG)

Engine Start

START

On (Start)

    Parts Location
    PARTS LOCATION ILLUSTRATION *1 FRONT SEAT INNER BELT ASSEMBLY RH *2 AIRBAG SENSOR ASSEMBLY *3 OCCUPANT DETECTION ECU ...

    System Diagram
    SYSTEM DIAGRAM Communication Table Transmitting ECU (Transmitter) Receiving ECU Signal Communication Method Airbag Sensor Assembly ...

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