2013 Toyota Sienna Owners Manual - Page 621

2-4. Using other driving systems Detection range of the sensors Approximately 2.0 ft. (60 cm) Approximately 2.8 ft. (85 cm) Approximately 5.9 ft. (180 cm) The diagram shows the detection range of the sensors. Note that the sensors cannot detect obstacles that are extremely close to the vehicle. The range of the sensors may change depending on the shape of the object etc. * *: if equipped