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      02-05-2013, 10:00 AM   #13
SchweiZ4
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Drives: 2013 335i M-Sport
Join Date: Dec 2012
Location: Switzerland

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It is designed for "ejection seat" option, available with the "Emergency pack".
Left blank button for driver seat, and right blank button for passenger seat.
Only working with the roof open.

Maybe it is just designed if you need add you own option button:
like Remote exhaust valve switch or Universal Garage door remote.