audi a8 2007 electric steering stopped working!!!

[vwpassat]

Hi. I've owned this car for a short while now. The steering was working fine. But now it no longer works even when i use the memory settings it does not change position.

I have checked fuse 6, 9 and 40 on drivers side and they all seem fine.

So i don't know what it can be.

I've read on another thread that

*** I took to Audi dealer in the end, and they eventually diagnosed it as a connection fault in the connector to battery manager. All working fine now. ***

Where is the battery manager?? And how would i go about doing this. I'm quite handy with electrics so hopefully shouldn't be too difficult.

Any help will be appreciated

Thank you