Lexus IS F 2012 Owner's Manual page 194

2-4. Using other driving systems
Detection range of the sensors
194
Approximately 1.6 ft. (50 cm)
Approximately 4. 9 ft. (150 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.