Everything seems to be working fine, from what i've seen just googling the code, it's a short in any one of the connections.... so that's awesome. I mean it could be worse, but there doesn't seem to be a way of narrowing down what connection it is.

 

The last time I fixed a S series sunroof drain I used compressed air to unclog the drain holes. There are two at the front corners of the sunroof opening.