I know this is an old post but figured I'd comment in hopes of helping others.
I also have spent a lot of time trying to figure out this same problem. Finally solved it yesterday. Turned out being the body control module.
That is very vague body control model (BCM).
First posts normally go in introductions else you could get a free fix and we never see you again!!!
Forum Rules and Guidelines
This is a new forum layout which is owned by a company last year that doesn't give a dam with loads of bugs which have been reported in the new thread. There is no TDI Wiki at the moment or original similes which they refuse to install. It doesn't show the car spec/location.
Add your car specs to your signature that will show on every post you make.
Car spec now shows not for all members.
Myturbodiesel moving on
We Are Live - Community Feedback
This has been talked about many times.
I've made a poll which no one has posted in, there are a few votes and comments.
Do you like the new forum features?
Wiki pages have been restored as of 7th December, I asked where is the link it should be on top of the main forum.