I have the opposite problem of most people with a TT Roadster. When the top is up, or closed and latched, everything is great. When the top is open, or down and stowed, I get the idiot light blinking on the dash. I think it is trying to tell me the top is not fully retracted, but it is. I cant find any information on a position sensor or microswitch that tells the system that the top is fully opened. Any ideas?