Acura 2008 MDX - Manual (Page 326)

Since the rearview camera display
area is limited, you should always
back up slowly and carefully, and
look behind you for obstacles.
Whenever you shift to reverse (R)
with the ignition switch in the ON
(II) position, the rear view is shown
on the navigation system screen.
For the best picture, always keep the
rearview camera clean, and do not
cover the camera lens. To avoid
scratching the lens when you clean it,
use a moist, soft cloth.
On vehicles with navigation system
Rearview Camera and Monitor
320