Locked out?
If you have a search around you will find a lot of info about this. But put briefly it amounts to this: If your battery goes flat you wont be able to get in your car. There is a procedure for opening the doors manually but it probably wont work. The boot lid will unlock manually so I think a lot of people run a + and - line back into the boot so they can supply power that way. What you DONT want to do is disconnect the battery then close the doors manually. My experience is that even if you are providing a seperate power source the original battery still has to be connected or you still cant get in. Yes I know it doesnt make sense electrically but there you go
Oct '00 E46 330i. Feb '92 525i (departed)