Wow! What manual are your referring to? I've looked everywhere and I have not located any sort of calibrate procedure. I'm very interested.

Follow-up: The calibration procedure was omitted in the 1st version of the 2005 owner's manual and a 2nd owner's manual was released which included the procedure. The 2006 owner's manual has it as well. Evidently even service tech's needed to learn about it as BMW issued an SIB on it.