I understand what your trying to do. Since there is power there and you can control what it does in the 16197427 maybe you can get it to turn off? work opisite of what it does?

The other idea that poped into my head when you brought this up was using another relay. Except when it is energized it would ground insted of turn on?

If you need more diagrams I have all the diagnostic charts like the first one listed for the 16197427 and a full set of the one you posted sideways...

EDIT: I had already uploaded them in the photgallery.
http://eagle-mark.com/pictures/index.php?cat=4&page=2