GMC Terrain 2010 Owner's Manual page 256

8-48 Driving and Operating
If the vehicle is traveling faster then
8 km/h (5 mph) in reverse, the red
light on the rear display flashes.
Objects must be at least 20 cm (8 in)
off the ground, below liftgate level,
and within 2.5 m (8 ft) from the rear
bumper to be detected. The
distance may be less during warmer
or humid weather.
A single beep sounds the first time
an object is detected between
0.6 m (23 in) and 2.5 m (8 ft) away.
Beeping occurs continuously when
the vehicle is 0.6 m (23 in) or closer
to an object.
The following describes how the URPA display lights appear as the vehicle
gets closer to a detected object:
Description
amber light
amber/amber lights
amber/amber/red lights and
continuous beeping for
five seconds
amber/amber/red lights flashing
and continuous beeping for
five seconds
Park Assist Off displays on the
Driver Information Center (DIC) to
indicate that URPA is off, see Driver
Information Center (DIC) on
page 4 25 for more information.
Metric English
2.5 m 8 ft
1.0 m 40 in
0.6 m 23 in
0.3 m 1 ft