When I bought my 2006 Hatchback, there were a few issues. One is the windshield wipers. I've used WD40 and 3-1 oil to loosen up the corrosion on the arms and they wipe now, but there is something wrong with either the switch or some sort of controller (if there is one). When I turn the switch to INT, it does nothing. When I turn it to the other two positions, it will turn on, but turn it back to INT or off, the wiper stops right where it is. I have taken off the switch and the contacts are clean.

So, is this a switch issue, or is there a controller down the line that needs replaced. Thanks in advance for the help.