Hi,
Welcome to the forum, If you are experiencing any issues with your car you can normally find an answer on here if you know where to look, a good place to start would be in the problems section for your model and use the search function, By the sound of your problem I am guessing you have an E85, in which case this thread may be of some help
http://www.z4-forum.com/forum/viewtopic.php?f=3&t=29949&p=411002&hilit=unlock+drivers+door#p411002