Not locking

Once in a while, and more often than not, my 99 olds alero 3.4 4 door will not lock either when I use the lock on the door, or the remote lock. I do, however, hear a clicking noise coming from the Fuse panel on the front drivers side!! What Gives? Could it be a faulty relay?

The door unlock and lock relays are located at the left side fuse box. Try swapping the relays. They are marked. A relay can click or energize but the contacts can be bad.