Toyota PRIUS Owner's Manual page 425

Assume an ordinary posture for backing up, rest your hands
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lightly on the steering wheel without applying any force, directly
confirm the safety of the area to the rear and around the vehicle
slowly back up while adjusting your speed by depressing the
brake pedal.
Depending on the condition of the parking space, steps
need to be repeated.
When the vehicle is almost entirely within the target parking spot,
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a high-pitched beep is emitted and the stop indicator is shown on
the display (→P. 419), stop the vehicle.
This completes the back-in parking assist mode.
● For safety, the buzzer sounds slightly before the vehicle is
completely entered within the target parking spot. Further-
more, at that point, system operation will also finish. Firmly
hold the steering wheel and slowly back up while adjusting
your speed by depressing the brake pedal to reach the desired
parking spot.
● Be sure to back up while checking the area to the front and
rear of the vehicle directly and by using the mirrors.
PRIUS_OM_OM47A31E_(EE)
4-5. Using the driving support systems
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to may
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