GMC 2011 Sierra Denali Owner's Manual page 314

9-62 Driving and Operating
Rear Vision Camera Error
Messages
Service Rear Vision Camera
System: This message can display
when the system is not receiving
information it requires from other
vehicle systems.
If any other problem occurs or if a
problem persists, see your dealer.
Rear Vision Camera Location
The rear vision camera is located in
the bezel for the tailgate handle.
The camera uses a special lens.
The distance of the image that
appears on the screen differs from
the actual distance. The area
displayed by the camera is limited.
The camera does not display
objects which are close to either
corner of the bumper or under the
bumper. The area displayed on
the screen can vary according to
vehicle orientation or road
conditions.
The following illustration shows the
field of view that the camera
provides.
A. View displayed by the camera
B. Corner of the rear bumper