Lexus GS430 User Manual page 414

STARTING AND DRIVING
Rear corner sensors
G31068
" 1 About 35 cm (1.1ft.) to about 50 cm (1.5 ft.)
2 About 25 cm (0.8 ft.) to about 35 cm (1.1 ft.)
3 Less than about 25 cm (0.8 ft.)
Display:
The indicator will flash yellow depending on the distance to the
obstacle. When the distance between the vehicle and the
obstacle is less than about 25 cm (0.8 ft.), the yellow indicator
will turn red.
Beeps :
As distance to the obstacle gets closer, the interval of the
intermittent sound gets shorter, and then finally to a continuous
sound when the distance between the vehicle and the obstacle
is less than about 25 cm (0.8 ft.).
390
Back sensors
G31069
" 1 About 60.0 cm (2.0 ft.) to about 150 cm (5.0 ft.)
2 About 45.0 cm (1.4 ft.) to about 60.0 cm (2.0 ft.)
3 About 35.0 cm (1.1 ft.) to about 45.0 cm (1.4 ft.)
4 Less than about 35 cm (1.1 ft.)
Display:
The indicator will flash in yellow depending on the distance to
the obstacle. When the distance between the vehicle and the
obstacle is less than about 35 cm (1.1 ft.), the yellow indicator
will turn red.
Beeps :
As distance to the obstacle gets closer, the interval of the
intermittent sound gets shorter, and then finally to a continuous
sound when the distance between the vehicle and the obstacle
is less than about 35 cm (1.1 ft.).