Fuse #18 blowing

Remove all three of those door relays and see if the fuse stops blowing, they are the "drivers door unlock", "door lock" and "door unlock" relays. Then if the fuse no longer blows, put them back in one at a time until you find out which one is blowing the fuse, then try a new relay for that one.
Those relays are in the auxiliary relay box #2 shown below. That auxiliary relay box #2 should be located under the hood.

That auxiliary relay box #2 should be located under the hood.
I see a auxiliary relay box #1 located under the hood at the right front corner, check next to or near it for the box #2.
Correction it does say auxiliary relay box number two left rear of vehicle, above wheel well.

I edited that last response to say you were correct, it does say auxiliary relay box #2 left rear of vehicle, above wheel well.

Okay, looking at the wiring diagram, it appears it could be either a short in the remote anti-theft personality module and any of the door lock/motors. So try disconnecting all of them then put the fuse and relay in and when the fuse stops blowing, hook back up each individual item until again you narrow it down to which it is.

You may just want to start with that one.

I thought you were going to disconnect that drivers door lock and see if the fuse stops blowing?
I suppose if you wanted to check the motor itself, you could use an ohmmeter.

Well, I suppose you could just cut the red/orange wire and test it that way and then repair the cut when done.