Chevrolet 2011 Volt Owner's Manual page 346

9-44 Driving and Operating
How the System Works
UFRPA comes on automatically
when the shift lever is moved into
R (Reverse). The front and rear
sensors are automatically turned on.
After the vehicle is shifted out of
R (Reverse), the rear sensors are
turned off and the front sensors
stay on until the vehicle is above a
speed of 8 km/h (5 mph). The front
sensors may also be turned on by
pressing the park assist button
in the overhead console without
shifting into R (Reverse) while the
vehicle is traveling at a low speed.
See Turning the System On and
Off later in this section.
When the vehicle is in N (Neutral),
the system may be active. If the
vehicle is in a car wash, the sensors
may detect objects in the car wash.
See Turning the System On and
Off later in this section to turn the
system off.
High-toned beeps from the front
speakers are for objects detected
near the front bumper. Low-toned
beeps from the rear speakers are
for objects detected near the rear
bumper. 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 25.4 cm (10 in) off the ground
and below hood or hatch level.
Objects must also be within
1.2 m (4 ft) in front of the vehicle
and 2.5 m (8 ft) from the rear
bumper. This distance may be less
during warmer or humid weather.
PARK ASSIST OFF displays on
the Driver Information Center (DIC)
to indicate that UFRPA is off.
The message disappears after
a short period of time.
I n f o r ma t i o n P r o v i d e d b y :
Objects Detected by Both the
Front and Rear Sensors
If objects are detected at the
same time near both the front and
rear bumpers while backing up,
the beeps only sound to indicate
that objects are close to the rear
bumper.
If an object comes within 0.3 m (1 ft)
of the front bumper while the vehicle
is backing up and at the same time
there is another object further than
0.3 m (1 ft) from the rear bumper,
then the beeps only sound to
indicate the object that is closer
to the front bumper.