ROAD SIGN ASSIST SYSTEM PRECAUTION


  1. IGNITION SWITCH EXPRESSION

    The type of ignition switch used on this model differs depending on 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 LOCK Off (Lock)
    Ignition Switch ACC ACC On (ACC)
    Ignition Switch ON ON On (IG)
    Engine Start START On (Start)

  2. HANDLING PRECAUTION FOR ROAD SIGN ASSIST SYSTEM


    1. Under the following conditions, signs may not be displayed or the system may not operate.


      • Misalignment has occurred in the installation of the pre-crash safety city sensor

      • Mud, snow, ice, a sticker, etc. is stuck to the windshield in the pre-crash safety city sensor's field of view

      • During poor weather, such as heavy rain, heavy snow or dense fog

      • A bright light source is shining in front of the pre-crash safety city sensor

      • The sign is dirty, faded, angled, bent or has poor contrast (if electronic)

      • A part of the sign is concealed

      • After the pre-crash safety city sensor acquires the sign, the vehicle passes by too quickly

      • The driving scene is misjudged

    2. Under the following conditions, the incorrect sign may be displayed or the system may not operate properly.


      • Speed limit signs on side roads may be detected and displayed (if positioned in the detection range of the front sensor) while traveling on a main road

      • Speed limit signs on roundabout exit roads may be detected and displayed (if positioned in the detection range of the front sensor) while traveling on a roundabout

      • The speed information displayed on the meter may differ from the speed information displayed on the navigation system (if equipped) due to the navigation system using map data

      • A sticker applied to the rear of the preceding vehicle is recognized as a sign

      • A shape resembling a supported sign is recognized

      • Immediately after moving over to a state or country with different speed limit units or driving directions

      • The driving scene is misjudged

  3. PRECAUTION FOR TROUBLESHOOTING


    1. If the malfunction is due to connectors being loosely connected, or improper installation of parts, reconnecting the connectors or removing and reinstalling the parts may temporarily or completely correct the problem.

    2. To determine the malfunctioning area, use DTCs, freeze frame data and other data to help determine conditions at the time of the malfunction. Write down the data before disconnecting connectors or removing and installing parts.

    3. The road sign assist system may be affected by malfunctions in other systems. Check for DTCs in other systems and, if present, troubleshoot those DTCs first.

  4. SERVICE PRECAUTIONS


    1. For parts that do not have specific inspection methods, perform all removal and installation procedures with the ignition switch off.

    2. After removal and installation of parts has been performed, check for DTCs and confirm that none are output.

  5. PRECAUTION FOR REPLACING PRE-CRASH SAFETY CITY SENSOR


    1. If the pre-crash safety city sensor has been replaced, or the windshield glass has been replaced or removed/installed, be sure to perform Recognition Camera/Target Position Memory and Recognition Camera Axis Adjust. If not performed, DTC C1AA9 will be stored when the pre-crash safety system is turned on.


    2. When replacing the pre-crash safety city sensor, replace it with a new one. If a pre-crash safety city sensor which was installed to another vehicle is used, the information stored in the pre-crash safety city sensor will not match the information from the vehicle and, as a result, a DTC may be stored.

    3. When replacing or removing and installing the pre-crash safety city sensor, do not damage the camera lens or allow it to become contaminated with foreign matter.

    4. Do not reuse a pre-crash safety city sensor that has been dropped or subjected to a strong impact.

  6. PRECAUTION FOR REPLACING WINDSHIELD GLASS


    1. When replacing the windshield glass of a vehicle equipped with a pre-crash safety city sensor, make sure to use a Toyota genuine part. If a non-Toyota genuine part is used, the pre-crash safety city sensor may not be able to be installed due to a missing bracket or the road sign assist system may not operate properly due to a difference in the transmissivity or black ceramic border.

    2. A004807

      Do not attach stickers, including transparent stickers, or other items to the outer side of the windshield glass within the area shown in the illustration in front of the pre-crash safety city sensor.


      • Vertical range: from the top of the windshield glass to approximately 10 cm (3.94 in.) below the bottom of the pre-crash safety city sensor.

      • Horizontal range: approximately 10 cm (3.94 in.) to the left and right of the center of the pre-crash safety city sensor.

    3. A004A40

      Do not install or attach anything to the inner side of the windshield glass within the area shown in the illustration below the pre-crash safety city sensor.


      • Vertical range: from the bottom of the pre-crash safety city sensor to approximately 10 cm (3.94 in.) below the pre-crash safety city sensor.

      • Horizontal range: approximately 10 cm (3.94 in.) to the left and right of the center of the pre-crash safety city sensor.

    4. Do not attach window tint to the windshield glass.