Lexus IS 350C 2012 Manual page 216

2-4. Using other driving systems
Detection range of the sensors
216
Approximately 1.6 ft. (50 cm)
Approximately 4. 9 ft. (150 cm)
Approximately 1.6 ft. (50 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.