Kia Troubleshooting Questions? Ask a Mechanic
This sounds more like a problem with the body control module. When you press the key fob, signal is sent to the module to lock the doors. If none of the doors work with the fob or the button, either it's not receiving the signal, or it's not responding to the signal.
Hate to say it, but probably the best thing to do is have it properly diagnosed with the use of a scan tool. Then if possible replace the part yourself, although programming will be required.
But you are saying no doors will lock or unlock right?
This isn't just a single door that is having the problem or am I misunderstanding that.
Sorry for the delay, lost my internet during a storm..