If the door locks work manually with using the key in the door then probably will need to just reprogram/initialize the key especially if its a new key. if the power door locks dont work at all using the key manually then first check the fuse.
initializing key:
all these steps must be completed within 15 sec. of cycling the key i.e. turning the key off
step 1: get in vehicle close all doors and trunk
step 2: turn ignition on tell all dash lights are on but engine is not started
step 3: turn ignition off pull key out
step 4: press and hold the unlock botton down while then at the same time press the lock button three times in a row
step 5: door locks should initializ at this point they will lock and unlock on there own to show process is completed
I also have a 2003 330i with the same problem and this solution didn't work. Do you have any other things I can try?
I have same car and the key will open all locks 1000 times in a row and then stop. You then can only open driver side door with key mechanically. No other door will open. Then later all is well again. At the moment only driver side door opens by hand with key.
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