I don't know. Mine is not a BMW one, but is virtually the same design. When I was searching forums for the issue of my alarm going off randomly, this thread suddenly explained what was happening to me. My vehicle sits in my driveway facing south. Lately, at about 9ish AM the alarm would go off if the sunshade was in. I forgot the sunshade for a few days and had no alarms. After putting back in, the alarm started going off again each morning.

It seems strange that only 2-3 people on all the BMW forums have reported this issue, but it's perfectly repeatable for me. I tried putting the sunshade in backward (reflective side in) and so far, it hasn't alarmed ( that I know of - I often can't hear it when inside my house). Too early to tell definitively, however. Otherwise, I guess I'll have to ditch the shade.

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)