Don't waste your time, more than likely you'll screw it up. Send it to the guy in the link below and he'll repair it for you for about $50, he did one of mine and has done quite a few for members here on the site.

BMW General Module 5 (GMV, ZKE V)

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2002 X5 4.6is
1999 C5 Corvette
1992 Mitsubishi 3000GT VR-4
1994 Kawasaki ZX-9R
2005 Mazda 6 Wagon (Wife's)
1991 Mitsubishi 3000GT VR-4