Lexus RX 450h 2014 Owner's Manual page 252

The distance display and buzzer
When a sensor detects an obstacle, the direction of and the approximate
distance to the obstacle are displayed and the buzzer sounds.
The site of the obstacle will flash (detection level 4 only).
■ Front corner sensors
Detection Multi-information
level
2
3
4
Approximate dis-
display tance to obstacle
(50 to 37.5 cm)
(37.5 to 25 cm)
0.8 ft. (25 cm) or
2-4. Using other driving systems
1.6 to 1.2 ft.
1.2 to 0.8 ft.
less
Buzzer
Medium
Fast
Continuous
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2