Sorry to resurrect an old thread, but did you ever resolve this? I'm having the same problem with my '10 35d. I unplugged my hood switch to eliminate that possibility. With the sunshade in place, the alarm goes off every morning at about the same time as the sun warms the vehicle up. If I leave the sunshade out, I get now alarm. Really weird.

AM.

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E70 2010 3.0 M57 AT Titanium Silver with Black Leather
E53 2004 3.0 M54 AT Toledo Blue with Gray Leather
E83 2008 3.0 N52 AT Silver Gray Metallic with Black Vinyl
E46 1999 2.8 M52TU 5MT Black with Tan Leather 250K+ miles (Sold, but not forgotten)