My 2015 's back up alarm isn't working. The camera works fine ,but no beeping. The on screen says; Check back up alarm . It's done this before and then it started working. Could it be dirty or something or is it a dealer thing. maybe a good thing when I am hooking up trailer. LOL

 

I suspect you can activate / deactivate it using your steering wheel controls. Go through the menu and might be called parking assist and see if you can turn it on / off.