I am having pretty much the exact same problem.
E90 328xi (2007)
-Replaced fuses 56 and 57 with 20A
-I can lock/unlock all doors with physical key in the door
-I can lock/unlock all doors with lock button on dash
-Key fob does not lock/unlock/open trunk/activate alarm
-Key fob DOES start car
-I sent the key fob into bmwgm5.com to see if it needed to be repaired/battery replaced but he said it was working properly.
Anyone have any ideas? I only have 1 key (I bought it used, he only had 1) and the previous owner has always had this problem.
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