Backup camera question

I just purchased a 2011 GLK-350 with low miles and when I programmed the backup camera to activate when I put the car in reverse, nothing happens unless I turn on the radio or open something else on the console screen. Is this my only option? With previous vehicles all I had to do was shift into reverse and the camera worked. What am I doing wrong?
Thanks for any direction you can provide that is not in the manual.
Thanks for any direction you can provide that is not in the manual.
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