GMC 2011 Sierra Denali Owner's Manual page 313

The delay after shifting out of
R (Reverse) is approximately
10 seconds. The delay can be
cancelled by performing one of the
following:
Pressing a hard key on the
navigation system.
Shifting into P (Park).
Reaching a vehicle speed of
8 km/h (5 mph).
There is a message on the rear
vision camera screen that states
Check Surroundings for Safety.
Adjusting the Brightness and
Contrast of the Screen
To adjust the brightness and
contrast of the screen, press the
MENU button while the rear vision
camera image is on the display. Any
adjustments made will only affect
the rear vision camera screen.
(Brightness): Touch the + (plus)
or (minus) screen buttons to
increase or decrease the brightness
of the screen.
(Contrast): Touch the + (plus) or
(minus) screen buttons to increase
or decrease the contrast of the
screen.
Symbols
The navigation system may have a
feature that lets the driver view
symbols on the navigation screen
while using the RVC. The Ultrasonic
Rear Park Assist (URPA) system
must not be disabled to use the
caution symbols. If URPA has been
disabled and the symbols have
been turned on, the Rear Parking
Assist Symbols Unavailable error
message may display. See
Ultrasonic Parking Assist on
page 9 57.
Driving and Operating
The symbols appear when an object
has been detected by the URPA
system. The symbol may cover the
object when viewing the navigation
screen.
To turn the symbols on or off:
1. Make sure that URPA has not
been disabled.
2. Shift into P (Park).
3. Press the MENU hard key to
enter the configure menu
options, then press the MENU
hard key repeatedly until Display
is selected or touch the Display
screen button.
4. Select the Rear Camera Options
screen button. The Rear Camera
Options screen will display.
5. Touch the Symbols screen
button. The screen button will be
highlighted when on.
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