When I had my 2012 Kia Optima and I pushed the lock button on the key fob, the tail lights would flash. Doesn't look like this happens on my 2014 Cadenza. Is it the same for you? I liked this feature since I could see from across the parking lot that my doors locked.
Thanks for the responses. I figured out why this was happening. It turns out that I have a defective hood closure sensor. If I lift my hood and have someone hold the switch down while I hit the lock button on the fob, the rear tail lights flash and the horn sounds. Funny that all this time that I've owned the car it " thought" that the hood was open. Taking it to the dealership next week for repair.