It depends on whether you have regular seats, sport seats, or comfort seats. The modules have different part numbers for each. Now it gets interesting. Two of those part numbers are marked "ended" on realoem, suggesting that they are no longer available. The comfort seat module is shown as available, it would be around $400. I have attached a clip of the parts book drawing, it is item #1 (only for the comfort seats). Suggest you talk to your dealer and see what the story is on any change-up part numbers for your specific vehicle. Realoem could just be out of date.
Here is a thread where a member took some pictures of changing out his module. It isn't hard to do, and is a fairly common failure.
http://www.xoutpost.com/bmw-sav-foru...wont-work.html
Good luck.
Jeff
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2007 X3 3.0si, 6 MT, Premium, White
Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue
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