Chevrolet 2010 HHR Owner's Manual page 158

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A. View displayed by the camera.
B. Corner of the rear bumper.
The rear vision camera system might not work properly
or display a clear image if:
The RVC is turned off. See Turning the Rear
Camera System On or Off earlier in this section.
It is dark.
The sun or the beam of headlights is shining
directly into the camera lens.
Ice, snow, mud, or anything else builds up on the
camera lens. Clean the lens, rinse it with water,
and wipe it with a soft cloth.
The back of the vehicle is in an accident, the
position and mounting angle of the camera can
change or the camera can be affected. Be sure to
have the camera and its position and mounting
angle checked at your dealer/retailer.
There are extreme temperature changes.