It's possible, but even though I understand that it happened when you pressure washed under the hood, the first thing that I would check is the contact switches in the door jambs; I'd try some WD40 on them while you work them in and out. If that doesn't do it, I'd remove and check them with an ohmmeter. Again, not that it couln't be something under the hood, but I would consider one of those switches more likely to be the culprit. And I'd start with the front ones, because, depending on how the body panels are configured, it is conceivable that you go water to those switches from the pressure washer.