Wiring harness in the steering column or ignition switch? Take the cover off the steering column and check around under the dash for any melted wiring. I don't think it affects the power seats or the locks however.
I'm assuming you checked the power distribution panel under the hood next to the battery. There are some circuit breakers in there. Checking the column switches is a good idea, as there are a couple of components that can lay down; the multi-function switch and ignition switch. If I can think of anything else, I'll post it.