This was posted on a thread I started called Electrical Gremlins and the following link was a great help, as was all the other advice I got in the original thread. Thanks everyone.
http://www.xoutpost.com/bmw-sav-forums/ ... ssues.html
The 'how to' is in an attachment at the bottom of the post. I didn't write it so can't take any credit. Just thought it might be helpful to someone else
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