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Buick Lucerne Owner Manual - 2011
Object Detection Systems
Ultrasonic Rear Parking
Assist (URPA)
For vehicles with the Ultrasonic Rear Parking Assist
(URPA) system, it operates at speeds less than 8 km/h
(5 mph), and assists the driver with parking and
avoiding objects while in R (Reverse). The sensors on
the rear bumper are used to detect the distance to an
object up to 2.5 m (8 ft) behind the vehicle, and at least
25 cm (10 in) off the ground.
{
WARNING:
The Ultrasonic Rear Parking Assist (URPA)
system does not replace driver vision. It cannot
detect:
.
Objects that are below the bumper,
underneath the vehicle, or too close or far
from the vehicle
.
Children, pedestrians, bicyclists, or pets.
(Continued)
WARNING: (Continued)
If you do not use proper care before and while
backing, vehicle damage, injury, or death could
occur. Even with URPA, always check behind the
vehicle before backing up. While backing, be sure
to look for objects and check the vehicle's mirrors.
How the System Works
URPA comes on automatically when the shift lever is
moved into R (Reverse). A single tone sounds to
indicate the system is working.
URPA operates only at speeds less than
8 km/h (5 mph).
An obstacle is indicated by audible beeps. The interval
between the beeps becomes shorter as the vehicle gets
closer to the obstacle. When the distance is less than
30 cm (12 in) the beeps are continuous.
To be detected, objects must be at least 25 cm (10 in)
off the ground and below trunk level. Objects must also
be within 2.5 m (8 ft) from the rear bumper. This
distance may be less during warmer or humid weather.
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