Subaru Legacy BN/BS (2015-2019) Owners Manual: 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 indicator and BSD/RCTA OFF indicator are turned off.
•  The vehicle is driven at speeds above 6 mph (10 km/h) (except when reversing).
•  The shift lever/select lever is in the "R" position (RCTA only).

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

•  The BSD/RCTA OFF indicator appears.
•  The vehicle speed is below 6 mph (10 km/h) even when the BSD/RCTA OFF indicator does not appear (except when reversing).

NOTE

•  In the following cases, the BSD/ RCTA will stop operating and the BSD/RCTA warning indicator will appear.

•  When a malfunction occurs in the system, including the BSD/RCTA approach indicator light

•  If the BSD/RCTA warning indicator appears, exercise proper caution. For details, refer to "BSD/RCTA warning indicator" .
•  In the following cases, the BSD/ RCTA will temporarily stop operating (or may stop operating) and the BSD/ RCTA warning indicator 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 prolonged period of time
•  When the temperature around the radar sensors increases excessively due to long driving on uphill grades in the summer, etc.
•  When the temperature around the radar sensors becomes extremely low
•  When the vehicle battery voltage lowers
•  When the vehicle voltage exceeds the battery voltage rating

The BSD/RCTA will resume operation once these conditions are corrected, and the BSD/RCTA warning indicator will disappear. However, if the BSD/ RCTA warning indicator appears for a prolonged period of 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 and through puddles

•  The radar sensors may not detect or may have difficulty detecting the following vehicles and objects.

•  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 lower body height such as a trailer with no cargo and sports cars)
•  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 in parallel at almost the same speed as your vehicle 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.