Why is my Hyundai creta audio system not working?

When You say the Audio system isn't working on Your Hyundai Creta, do You mean it's not turning on at all, or do You have power, but aren't hearing Audio In the latter case, sometimes it's as simple as the inadvertent pressing of the mute button. If You've got no Audio, or if You have no display in general, before we assume the head unit itself has failed, You'll want to check the fuses. This also serves as a way to do a cold set of the radio. There are a couple fuses related to the operation of the radio in the fuse boxBy the steering wheel. First, check that they're good, and then pull the radio related ones. Leave for a couple hours like this; no need to be impatient here. Plug back in, and see if Your radio functionality returns; of course, if any of the fuses are actually blown, that's going to be why You have no power to the unit, too!