Door Locks
 

The door locks on my 1998 Quest seem to have a mind of their own. They lock themselves at random. Sometimes they relock several times in a row before you can even reach for the door handle. Upon some previous advice I replaced the Master Switch in the Drivers Door but, it didn't have any affect.
I've also been told that it's the Smart Entry Control but, I don't have any idea where it's located or what is involved in replacing it.
Is it something that can be disabled without losing the use of the remote locking operation?
Any help would be greatly appreciated.
Thank you.
Frank