See post #12 in this thread, try what they did in the picture - http://www.xoutpost.com/bmw-sav-foru...t-issue-2.html

Also might be the BST battery cable assuming the E53 has one, assume it does?

You should be able to find the problem pretty easily.

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2008 4.8i Black with Tabacco. Black Y-spoke wheels and shadowline trim.