ROAD SIGN ASSIST SYSTEM


  1. Function


    1. The RSA system recognizes the following traffic signals using the forward recognition camera.

      Category Sign Type Example of Recognizable Sign
      Speed Limit Round maximum speed limit/End of speed limit A01W75N
      No Overtaking No overtaking/End of no overtaking A01W7Q6
      Supplemental Signs Road condition signs Ramp Way A01W7OB
      Rain A01W74A
      Wet A01W7NS
      Ice A01W7FU
      End of Prohibition A01W7XL

    2. The RSA system recognizes the following traffic signals using the forward recognition camera.

      Category Display Example Details
      Speed Limit Related A01W7O3

      • Informs the driver of the maximum speed limit of the currently driven road.

      • The displayed sign reflects the speed limit on the recognized sign.
      No Overtaking Related A01W7SU Informs the driver when they are in a no overtaking zone on the currently driven road.
      All Canceled (All restrictions canceled. Return to default road regulations.) A01W7XL Informs the driver when all applicable prohibitions, such as speed limit and no overtaking, have ended.
      Speed Limit with Supplemental Sign Related Ramp Way A01W7M2 Informs the driver of the ramp way direction. However, this item is not displayed when making a lane change without operating the turn signal light.
      Rain A01W7OC Informs the driver of the maximum speed limit on the currently driven road when it is raining or the road surface is wet.
      Ice A01W7BH Informs the driver of the maximum speed limit on the currently driven road when there is accumulated snow or ice.
      Blank A01W7CJ The display is blank when the system is unable to recognize a supplemental sign.

    3. Notification functions are used in the RSA system which inverts the colors of displayed signs, flash signs, etc. to notify the driver.


      1. Speed Limit Exceeded Notification


        • While a speed limit sign is displayed, if the actual vehicle speed exceeds the speed limit plus a designated threshold*, the colors of the displayed sign are inverted. For example, if the threshold is set to 5 km/h and the speed limit sign is 60 km/h, the colors of the displayed sign are inverted when the actual vehicle speed exceeds 65 km/h. Furthermore, the system also inverts a speed limit sign with supplemental sign in the same way. However, the system does not invert the colors of the supplemental sign.

        • The buzzer may be set to sound during notifications through the customization function. However, if a speed limit recognized from a speed limit with supplemental sign is exceeded, the buzzer does not sound.

        • This notification is judged according to the speed units estimated by the forward recognition camera. When moving to a region with different speed units, notifications may be incorrectly issued until learning is complete. (The user can change speed units of the meter for the given region, therefore displays and notifications can be correctly issued directly after moving to a region with different speed units.)


          • *: The threshold can be adjusted to 1 of 3 levels through the customization function.

        Notification Method Display Example
        Inverted Display A01W75M

      2. No Overtaking Notification


        • While a no overtaking sign is displayed, if the system detects that the vehicle is attempting to overtake another vehicle, the system flashes the displayed sign.

        • The buzzer may be set to sound during notifications through the customization function.

        Notification Method Display Example
        Flashing Display A01W7UI

  2. SYSTEM CONTROL


    • The RSA can be turned on or off through the settings tab of the multi-information display.

    • A customization function is used for the RSA, which allows settings such as the notification method and level for exceeding the speed limit to be changed. Setting changes are made through the customization tab of the multi-information display. Refer to the Repair Manual for details.


    1. RSA Control Pattern 1


      1. After a road sign is recognized by the forward recognition camera and the vehicle passes by, the sign is displayed on the multi-information display.

      2. While a sign is displayed on the multi-information display, if a new road sign is not recognized within a specified distance, display of the current sign is turned off.

        A01W73DE01
        *1 Road Sign Recognized
        *2 Specified Distance Driven
        *3 Sign display off
        *4 Sign display on

    2. RSA Control Pattern 2


      1. When the engine switch is turned off while a sign is displayed on the multi-information display, the same sign is displayed when the ignition switch is turned ON again.

        A01W7V5E01
        *1 Ignition Switch is Turned On
        *2 Ignition Switch is Off
        *3 Sign display on

    3. RSA Control Pattern 3


      1. While a sign is displayed on the multi-information display, the sign is turned off when turning left or right onto a new road.

        A01W7G5E01
        *1 Road Sign Recognized
        *2 Sign display off
        *3 Sign display on

  3. CONSTRUCTION


    1. Forward Recognition Camera


      1. The forward recognition camera (camera sensor) is composed of a monocular camera and camera sensor ECU.

      2. The RSA is controlled by the monocular camera and camera sensor ECU.

        A01W7Y3C01
        *1 Forward Recognition Camera (Camera Sensor) - -
        *a Monocular Camera *b Forward Recognition Camera ECU
        *c Camera Sensor Recognition Area *d Camera Sensor Recognition Range
        *e The illustration shown is an example only. - -

      3. Road signs captured by the monocular camera are output to the camera sensor ECU.

      4. The camera sensor ECU judges road signs recognized by the monocular camera and displays information based on these judgments on the multi-information display.

        A01W74RE01

      5. When one of the following operations is conducted, the forward recognition camera angle must be adjusted. For details, refer to the Repair Manual.


        • The forward recognition camera is removed and reinstalled or replaced.

        • Parts relating to the tire or suspension are replaced or adjusted.

        • Strong force is applied onto the forward recognition camera.

  4. OPERATION


    1. Combination Meter


      1. The combination meter assembly displays recognized signs on the multi-information display based on information of road signs recognized by the forward recognition camera.

      2. The RSA system display mode can be selected by switching the display mode of the multi-information display through operation of the multi-information switch in the steering pad switch assembly.

      3. When the driving assist system information tab is selected for display on the multi-information display, road signs recognized by the forward recognition camera are displayed on the upper portion of the multi-information display.

      4. A maximum of 3 signs can be displayed simultaneously. When 3 signs are displayed, the signs are displayed in the following order from left to right: speed limit related, speed limit with supplemental sign related and no overtaking related.

        A01W7XFC01
        *a Speed Limit Related *b Speed Limit with Supplemental Sign Related
        *c No Overtaking Related *d The illustration shown is an example only. The illustration may differ from the actual vehicle screen.

      5. When an information tab other than the driving assist system information tab is selected for display on the multi-information display, road signs recognized by the forward recognition camera are displayed as pop-ups on the lower center portion of the multi-information display. Furthermore, the pop-up display is only for speed limit signs. It is not displayed for any overtaking signs and speed limit with supplemental signs.

        A01W7Q9C01
        *a Speed Limit Related *b Multiple Road Sign Recognized
        *c The illustration shown is an example only. The illustration may differ from the actual vehicle screen. *d

      6. When there is a malfunction in the RSA system or the system is temporarily unusable, a warning message is displayed on the multi-information display, the master warning light illuminates and the buzzer sounds.

        Condition Multi-information Display Master Warning Light Buzzer
        System Malfunction Check RSA system Illuminates Sounds
        Forward Recognition Camera Temperature High Front Camera Systems Unavailable Wait a Moment - -
        Windshield Glass Dirty Front Camera Systems Unavailable Clean Windshield. - -