Lexus GS430 User Manual page 404

STARTING AND DRIVING
Rear corner sensors
G31058
" 3 About 37.5 cm (1.1 ft.) to about 50 cm (1.5 ft.)
4 About 25 cm (0.8 ft.) to about 37.5 cm (1.1 ft.)
5 Less than about 25 cm (0.8 ft.)
380
The rear corner sensor only operates when the
transmission is in "R", it checks the approximate distance
to obstacles at an angle to the rear of the vehicle, and
sounds a warning depending on the distance.
1 Multi−information display:
The indicator bars will come on depending on the
distance to the obstacle and will flash when the distance
between the vehicle and the obstacle is less than about
25 cm (0.8 ft.).
2 Screen:
The indicator bars will come on in 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 bars 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.).
CAUTION
When backing up, be sure to confirm a safe distance
around your vehicle with your eyes to avoid an accident.