What year is your car, Sauraus. I've seen some people post that none of the audio controls work when the car is in reverse (I think it's actually when the screen is lowered). The controls work normally on my 2015, and I'm guessing your problem is found on the 2014 models, and maybe early 2015s, and was corrected later. You might check with your dealer and see if there are any software upgrades available for your car.