03 Kia Sedona. My power locks unlock and lock at any time. Even when van is off and sitting for hours. You can stand outside and hear them locking and unlocking. It happens while I'm driving as well. How do I solve this problem? Should I reprogram the keyless entry key-fob?

You don't say 'why'?

Just over $100, or for cheap, go to a auto salvage yard. Don't forget the lock cylinder and key are also part of the anti-theft system and engine immobilizer.

https://www.google.com/search?q=2006+Kia+Sedona+van.+ignition+lock+cylinder

..

Push the lock button on your key fob for three seconds, until the lights on your dashboard blink. Your key has been reprogrammed, and your alarm and computer have been reset. Turn your Kia off, remove the jumper wires and close the hood.

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i would try to lubricate the door locks even oil the key and put it in the locks i think the key hole lock on the door is stuck

You have a defective door lock actuator motor, more then likey water has gotten into it from a torn weather seal boot. Remove the door panel and replace it.

Click the link below :----http://wikisolutions.blogspot.in/2012/02/get-free-answers.html

Try using the other key to lock and unlock the car and start it but keep the original key that was used when the wiring was messed with away from the car this has worked in the past also some times just let the car sit for a while and use the remote to lock it for a bit like 5 mins then unlock it with that second key we were talking about not the first one when the problem happened.

You have a sticky motor somewhere, they tend to unlock but only half way so the motor tries to lock and unlock again, all I can suggest is get some WD40 and spray all your locks including the bootlock and all the mechanisms dont be shy with the WD40 after you have done all the locks do the keyholes etc aswell and then lock and unlock the car with the key on all locks and then lock and unlock repeatedly with the remote locking button.

Hope this helps
Regards
Dan. If you need more info about the internal door motors get back to me.

should like water has frozen inside the door on the mech, its probely released by now , or water has cause a short in the door electrics

Could be the door unlock relay is bad . Has a Separate relay for locking the doors . You'll have to look in your fuse boxes for location .

MY WIFE HAD KEYS FOR KIA MADE AT WALMART