You should get a communication error, do you know the error number?
Most likely the module is faulty. I replaced mine for the same reason. Get a new/used module and replace it yourself. It's not an easy job since you have to take the central console out but it's doable.

http://www.xoutpost.com/bmw-sav-foru...placement.html

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4.8is 2004 imola red
4.8is 2005 Black on Black - DINAN/2 sold
4.4 2004 X5
2003 330xi
2008 328xi - sold
4.4 2000 X5 - sold