Haha, yes now I see what you mean! The button is in the controller module so you would probably need to take it apart to gain access. You might be able to get away with bypassing to full power with the seats and steering wheel but I wouldn't try it with the rear defroster.

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1988 325is (purchased new) sold
2004 X5 3.0 2005 X3 2.5
2008 X5 3.0 (new to me)