I've been having several electrical issues with my 1997 Honda Prelude Type-SH lately. I know for a fact that the ignition switch is bad, because I have been having several issues involving the indicator lights on the dash, as well as problems with the key turning over on the first try.

However, my question is this: sometimes when I am driving, the doors will lock and unlock by themselves. To my knowledge, the power door lock power circuit is not in any way related to the ignition switch... or is it? Could the ignition switch be causing my lock problem?

Here's another interesting thing... this lock problem only occurs when I have my headlights turned on. I have an H.I.D. projector retrofit that is wired off of two relays that are wired directly off of the battery terminal.

 

I don't think this will help you at all but maybe you'll get something out of it.
i had a cheap receiver installed in my car before and weeks later i started getting the same thing you are getting, my doors would unlock but the radio would also shut off, then after a few minutes everything would go back to normal. took the receiver out, put new one in and problem was gone.

it could be in the way that the projectors are wired, something is getting crossed.