2011 Acura RL Owner's Manual - Page 384

Backup Sensor System The system may not function properly under these conditions: The sensors are covered with snow, ice, mud, etc. When the vehicle is on a rough road, on grass, or on a hill. After the vehicle has been sitting out in hot or cold weather. Within about 24 in (60 cm) Within about 59 in (150 cm) The range of the corner sensors and the rear center sensors are limited. Each corner sensor is capable of sensing an obstacle within about 24 in (60 cm). The rear center sensors sense an obstacle within about 59 in (150 cm). Do not put any accessories on or around the sensors. When the system is affected by some electrical equipment or devices generating an ultrasonic wave. When operating the vehicle in bad weather. 378