Why are my 2015 Kia Sedona headlights not working?

There are a number of reasons that Your 2015 Kia Sedona's headlights will fail to work, and diagnosing the specifics will either require a bit of trial and error or a digital multimeter and some patience. The first thing You should check is the bulb itself; this is especially true if there is only one that's not working. Swap them around, and see if it's the bulb or the position. You may also be looking at a failed headlamp, a bad headlamp relay, or bad wiring, among a few other causes. It can be difficult to pinpoint, but if You have the tools, You can test the components one by one. If You discover that the cause is a blown fuse, You'll still want to investigate further; a blown fuse is usually the symptom, and not the cause, of a problem. They don't just blow themselves; something in the electrical system caused a voltage spike that blew out the fuse.