Subaru Forester: Reverse Automatic Braking (RAB) system (if equipped) / Operating conditions

The Reverse Automatic Braking (RAB) system will operate when all of the following conditions are met.

1. EyeSight warning indicator
2. RAB warning indicator
3. RAB OFF indicator

• The ignition switch is in the “ON” position.
• The EyeSight warning indicator is off.
• The RAB warning indicator is off.
• The RAB OFF indicator is off.
• The Reverse Automatic Braking (RAB) system is set to on.
• The select lever is in the “R” position.
• The vehicle speed is between 1 to 9 mph (1.5 to 15 km/h).

NOTE

• In the following cases, the Reverse Automatic Braking (RAB) system will not operate. Promptly contact a SUBARU dealer to have the system inspected.
  • The EyeSight warning indicator is illuminated.
  • The RAB warning indicator is illuminated.
• When the RAB OFF indicator is illuminated, the Reverse Automatic Braking (RAB) system cannot be operated.
• In the following cases, the system may not be able to properly detect an obstacle. Promptly contact a SUBARU dealer to have the system inspected.
  • A sticker, paint, or a chemical is applied to the sonar sensor or the rear bumper near the sonar sensor.
  • The rear bumper is modified.
  • The rear bumper has been removed and reattached.
  • The ground clearance is changed due to the vehicle’s loading condition or modification.
  • Ice, snow or mud is adhered to the rear bumper near the sonar sensor.
  • The rear bumper is exposed to strong impact, or the rear bumper is deformed.
• When the 8-in audio/navigation system is performing a software update, the Reverse Automatic Braking (RAB) system may not display the following items on the audio/navigation screen until the update is complete.
  • Display Icon on/off Function
  • Distance Indicator Image
  • Warning Message
• On a steep hill, the system’s automatic braking ability will be reduced.
• The system is designed to avoid collisions by automatic hard braking when the vehicle’s reversing speed is less than approximately 3 mph (5 km/h). However, the system does not guarantee that the vehicle will be able to avoid collisions in any situation.
• If the vehicle is reversed at an extremely slow speed, the driver’s operation may be prioritized. In this case, automatic braking will not operate.
• The system may not be able to detect the following objects.
  • Sharp or thin objects such as poles, fences and ropes which may not reflect the sound wave emitted from the sonar sensor.
  • Objects that are too close to the rear bumper when the select lever is set to the “R” position.
  • Objects with a surface which may not reflect the sound wave emitted from the sonar sensor such as a chain link fence.
• Objects the system is not designed to detect.
  • Pedestrians
  • Moving objects including moving vehicles
  • Objects which absorb sound waves such as cloth or snow.
  • Objects whose surface has a diagonal angle.
  • Objects that are low to the ground such as parking blocks.
  • Objects that are high above the ground such as objects hanging from above.
• The system may not be able to properly detect objects or may cause a system malfunction when the following conditions exist.

  High frequency sound from other sources are nearby:

  • Horn sounds from other vehicles.
  • Engine sounds from other vehicles.
  • Sounds of air brakes
  • Vehicle detection equipment or a sonar from other vehicles
  • A sound wave with a frequency similar to the vehicle’s system is transmitted nearby.
  • A vehicle equipped with the same system is reversing toward your reversing direction.

  Weather conditions:

  • Extremely high or extremely low temperatures in which the area near the sonar sensor becomes too hot or too cold to operate.
  • The sonar sensors or the rear bumper near the sonar sensors is exposed to heavy rain or a significant amount of water.
  • Fog, snow or sandstorm, etc.
  • Air is moving rapidly such as when a strong wind is blowing.

  Parts attached to the rear bumper near the sonar sensor:

  • Commercial electronic parts (fog light, fender pole, radio antenna) or commercial attachment parts (trailer hitch, bicycle carrier, bumper guard) are attached.
  • Parts that emit high frequency sound, such as a horn or speaker, are attached.

  Vehicle conditions:

  • The vehicle is significantly inclined.
  • The ground clearance is significantly reduced due to the vehicle’s loading condition, etc.
  • When the sonar sensor is misaligned due to a collision or an accident.

  Surrounding environment:

  • A cloth banner, flag, hanging branch or railroad crossing bars are present in the reversing direction.
  • When reversing on a gravel or grassy area.
  • When reversing in an area where objects or walls are adjacent to the vehicle such as narrow tunnels, narrow bridges, narrow roads or narrow garages.
  • Wheel tracks or a hole is present in the ground of the reversing direction.
  • When reversing over a drainage cover (grate cover).

    

    

  • The path of the reversing direction is inclined such as on a steep uphill.
  • A curb is present in the reversing direction.
  • When reversing downhill.

    

  • When reversing on an uneven road.
• In circumstances such as the following, it may not be possible to avoid a collision even when the system operates normally.
  • Roads are slippery.
  • The tire air pressure is not correct.
  • The tires have become worn.
  • Tires which are not the designated size are installed.
  • Emergency repairs were performed using a puncture repair kit.
  • The suspension was modified.
  • Tire chains are installed.
  • Vehicle driving is unstable due to accident or malfunction.
  • The brake warning light is illuminated.