Just a suggestion but I think I would continue around and tighten all the cables on the battery, the ground on the frame and the positive cable to the solenoid. It strikes me as odd that you had a bad battery cable and now get an error that I don't think anyone has ever seen before.
As far as washing, I have not found or heard that these bikes are very sensitive to water. You certainly may have a problem around the ignition switch but again, I would go back to the battery cables; we have seen quite a lot of problems originate there, including a lot of KiPass problems.
Brian
I was driving when the message Appeared flashing on the board.