do you have Comfort access, if you do have you changed the battery... it does not charge like the non-CA fob...
the manual says press for 1 second... then let go... if you don't let go and you press longer, the alarm goes off and the trunk does not open...
we try and listen for the trunk to pop before we let go.. doesn't work that way... press for a second or 2 (no more but my experience is it needs more than 1 sec and less than 3) then let go of the button... the trunk will open after you release the button...
hope this helps... I know it's totally different than other cars and took me a while to realize this part...
07 650i Cabrio CPO, Titanium Silver
Black Matte Grill
Dark Birch Wood Interior and Shifter
HUD, Cold Weather and Sports Package
Logic 7 Sound
Aluminum Racing Pedals
K&N Air Filters
Rays Master Piece REM 20" Forged wheels w/ Conti Extreme DWS