Subaru Forester: System operation / Operating conditions

The BSD/RCTA will operate when all of the following conditions are met.

  • The ignition switch is in the “ON” position.
  • The BSD/RCTA warning light and BSD/ RCTA OFF indicator light are turned off.
  • The EyeSight warning indicator is off.
  • The vehicle is driven at speeds above 7 mph (12 km/h) (except when reversing).
  • The select lever is in the “R” position (when reversing).

The BSD/RCTA will not operate in the following situations.

  • The BSD/RCTA OFF indicator light is on.
  • The vehicle speed is below 6 mph (10 km/h) even when the BSD/RCTA OFF indicator light remains off (except when reversing).


  • In the following case, the BSD/RCTA will stop operating and the BSD/RCTA warning light will appear. If the BSD/ RCTA warning light appears, have your vehicle inspected at a SUBARU dealer as soon as possible.
    • When a malfunction occurs in the system, including the BSD/RCTA approach indicator light.
  • In the following cases, the BSD/ RCTA will temporarily stop operating (or may stop operating) and the BSD/ RCTA OFF indicator light will appear.
    • When the radar sensor becomes significantly misaligned (If the orientation of the radar sensor is shifted for any reason, readjustment is required. Have the sensor adjusted at a SUBARU dealer.)
    • When a large amount of snow or ice sticks to the rear bumper surface around the radar sensors.
    • When the vehicle is driven on a snow-covered road or in an environment in which there are no objects around (such as in a desert) for a long time.
    • When the temperature around the radar sensors increased excessively due to long driving on uphill grades in summer, etc.
    • When the temperature around the radar sensors becomes extremely low.
    • When the vehicle battery voltage lowers.
    • When an overvoltage occurs in the vehicle battery.

    When the above conditions are corrected, the BSD/RCTA will resume operation and the BSD/RCTA OFF indicator light will disappear. However, if the BSD/RCTA OFF indicator light has appeared for a prolonged time, have the system inspected at a SUBARU dealer as soon as possible.

  • The detectability of the radar sensors is restricted. The BSD/RCTA detection may be impaired and the system may not operate properly under the following conditions.
    • When the rear bumper around the radar sensors is distorted.
    • When ice, snow or mud adheres to the rear bumper surface around the radar sensors.
    • When stickers, etc. are affixed on the areas of the radar sensors on the rear bumper.
    • During adverse weather conditions such as rain, snow or fog
    • When driving on wet roads such as snow-covered roads or through puddles
  • The radar sensors may not detect or may have difficulty detecting the following.
    • Small motorcycles, bicycles, pedestrians, stationary objects on the road or road side, etc.
    • Vehicles with body shapes that the radar may not reflect (vehicles with a low body height such as sports cars or a trailer with no cargo).
    • Vehicles that are not approaching your vehicle even though they are in the detection area (either on a neighboring lane to the rear or beside your vehicle when reversing). (The system determines the presence of approaching vehicles based on data detected by the radar sensors.)
    • Vehicles traveling at significantly different speeds
    • Vehicles driving parallel to your vehicle at almost the same speed for a prolonged time
    • Oncoming vehicles
    • Vehicles in a lane beyond the neighboring lane
    • Vehicles travelling at a significantly lower speed that you are trying to overtake
  • On a road with extremely narrow lanes, the system may detect vehicles driving in a lane next to the neighboring lane.
  • When the 8-inch audio/navigation system is performing a software update, the RCTA warning icons may not be displayed on the audio/navigation screen until the update is complete.

    System operation


    BSD/RCTA approach indicator light/warning buzzer

    When the BSD/RCTA is active, the BSD/ RCTA approach indicator light will operate to alert the driver when there are vehicles in the neighboring lanes...

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    Outside temperature indicator

    The outside temperature is displayed on the multi-function display (color LCD).


    The outside temperature indicator shows the temperature around the sensor. However, the temperature may not be indicated correctly or the update may be delayed in the following conditions. While parking or driving at low speeds When the outside temperature changes suddenly (example: when going in and out of an underground parking area or when passing through a tunnel) When starting the engine after being parked for a certain period of time The temperature unit cannot be changed.

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