How The System Works - Buick 2008 Lucerne Owner's Manual

How the System Works

URPA comes on automatically when the shift lever is
moved into REVERSE (R). The rear display will then
briefly illuminate to let you know the system is working.
URPA operates only at speeds less than 5 mph
(8 km/h). If you are above this speed, the red light on
the rear display will flash.
To be detected, objects must be at least 10 inches
(25.4 cm) off the ground and below trunk level. Objects
must also be within 8 feet (2.5 m) from your rear
bumper. This distance may be less during warmer or
humid weather.
A single beep will sound the first time an object is
detected between 20 inches (0.5 m) and 8 feet (2.5 m)
away. Beeping will occur for three seconds when
you are closer than 1 foot (0.3 m) from the object.
The following describes what will occur with the URPA
display as you get closer to a detected object:
Description
amber light
amber/amber lights
amber/amber/red lights
amber/amber/red lights
flashing and beep for
three seconds
2-40
English Metric
8 ft 2.5 m
40 in 1.0 m
23 in 0.6 m
1 ft 0.3 m
The system can be disabled through the Driver
Information Center (DIC). See "Park Assist" under DIC
Operation and Displays on page 3-49 for more
information.
When the System Does Not Seem to
Work Properly
•
The driver disables the system.
•
The parking brake pedal is depressed.
•
The ultrasonic sensors are not clean. Keep your
vehicle's rear bumper free of mud, dirt, snow,
ice and slush. For cleaning instructions, see
Washing Your Vehicle on page 5-98.
•
A trailer was attached to your vehicle, or a bicycle
or an object was hanging out of your trunk during
your last drive cycle, the red light may illuminate in
the rear display. Once the attached object is
removed, URPA will return to normal operation.
•
A tow bar is attached to your vehicle.
•
The vehicle's bumper is damaged. Take the vehicle
to your dealer/retailer to repair the system.
•
Other conditions may affect system performance,
such as vibrations from a jackhammer or the
compression of air brakes on a very large truck.
If the system is still disabled, after driving forward at
least 15 mph (25 km/h), take your vehicle to your
dealer/retailer.