ROAD SIGN ASSIST SYSTEM

FUNCTION OF MAIN COMPONENTS

1. The main components in the RSA have the following functions.

   Item		Function
   Forward Recognition Camera		Captures road signs. Performs RSA system control based on information of road signs captured by the monocular camera sensor.
   Camera Heater (Forward Recognition with Heater Hood Sub-assembly)		The camera heater is heated according to signals from the forward recognition camera.
   Millimeter Wave Radar Sensor Assembly		detects object information and sends signal to forward recognition camera.
   Spiral Cable with Sensor Sub-assembly	Steering Sensor	Detects the steering direction and angle of the steering wheel.
   Yawrate Sensor		Detects the yaw rate and lateral/longitudinal deceleration of the vehicle and transmits the signal to the forward recognition camera.
   Combination Meter Assembly	Multi-information Display	Displays road signs recognized by the forward recognition camera. The RSA system can be turned on and off through the settings tab.
   	Buzzer	Sounds for speed limit exceeded and no overtaking notifications.*1
   Steering Pad Switch Assembly	Meter Control Switch	Sends a multi-information operating signal to the forward recognition camera.
   Hybrid Vehicle Control ECU Assembly		Sends a shift position signal to the forward recognition camera.
   Skid Control ECU Assembly		Sends a vehicle speed signal from the speed sensor to the forward recognition camera.
   Main Body ECU (Multiplex Network Body ECU)		Sends country specification information signals to the forward recognition camera.
   Air Conditioning Amplifier Assembly		Sends the outside temperature signal to the forward recognition camera.
   Radio Receiver Assembly*2		Sends map information to the forward recognition camera. Performs coordinated control with the forward recognition camera in regards to speed limit information.
   Central Gateway ECU (Network Gateway ECU)		Relays and transmits each CAN communication data signal.

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

   *2: Models with navigation system

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
   No Overtaking		No overtaking/End of no overtaking
   Supplemental Signs	Road condition signs	Ramp Way
   		Rain
   		Wet
   		Ice
   End of Prohibition
   No Entry*

   *: Models with navigation system

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

   Category		Display Example	Details
   Speed Limit Related			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			Informs the driver when they are in a no overtaking zone on the currently driven road.
   No Entry*			Informs the driver that there are vehicle entry restricted sections on the currently driven road.
   All Canceled (All restrictions canceled. Return to default road regulations.)			Informs the driver when all applicable prohibitions, such as speed limit and no overtaking, have ended.
   Speed Limit with Supplemental Sign Related	Ramp Way		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		Informs the driver of the maximum speed limit on the currently driven road when it is raining or the road surface is wet.

   Speed Limit with Supplemental Sign Related	Ice		Informs the driver of the maximum speed limit on the currently driven road when there is accumulated snow or ice.
   	Blank		The display is blank when the system is unable to recognize a supplemental sign.

   *: Models with navigation system

3. Notification functions are used in the RSA system which invert 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 monocular camera sensor. When moving to a region with different speed units, notifications may be incorrectly issued until learning is complete.

        Tech Tips

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

      Notification Method	Display Example
      Inverted Display

   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

   3. No-entry Notification (Models with navigation system)

      
      

      • While a no entry sign is displayed, if the system detects that the driver is driving on a road where entry is prohibited, based on map information, 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

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

5. 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.

SYSTEM CONTROL

DIAGNOSIS

1. If a malfunction is detected in the RSA system the forward recognition camera. cancels the RSA, sounds the buzzer in the combination meter assembly, and displays a message on the multi-information display to inform the driver of the malfunction.

2. At the same time, the malfunction is stored in memory as a Diagnostic Trouble Code (DTC). When a Global TechStream (GTS) is connected to the DLC3, the DTC can be read. For details, refer to the Repair Manual.