It doesn't cover the heated seat element in any way, it was for the airbag detection system, ie it sensed the passenger's weight. It was confused with the seat heating pad by several posters.

The only service bulletin I am aware of is documented in post #23. It was for the 5 series, driver's backrest (not seat bottom) and was due to a defect in a limited number of seats.

There may have been other recalls, but I am not aware of them.

In general, seat bottom cushion heating elements have been wearing out as long as manufacturers have been making them. If they wear out during the warranty period, they are generally covered. After the warranty expires, it is no longer warranty, but some have had them replaced under a policy settlement by making sufficient noise (squeaky wheel, etc). Others, even loyal customers, not so much.

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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