1990 bmw 5 series one back door locked will not open other 3 doors ok..

SOURCE: I cannot open the doors

This is a common fault on the series 3 usually down to the General Module 5 or GMV relays breaking down. Item is situated behind glove box reasonably easy to replace. Cost from BMW about £240.00 Can be found through breakers about £60.00. Keys will have to be recoded. See www.bmwgm5.com for more info.
bmmonks

SOURCE: Battery is dead. Doors are locked. Can't get into car.

I m a locksmith and had the same problem

What you do is:

HOld The handle up while you turn the key to the opening direction, it will feel as though it may bend the key but it will not.

keep pulling the handle until the button pops up it works I did it

SOURCE: 2002 BMW 325 - key locked in trunk

There are several suggestions out there on how to retrieve BMW keys from the trunk. Many of the ways I tried failed, and it takes 2 to 3 days to get a new key made up. In the coupe there is the center piece in the back seat that folds down. Then on the back wall there is material that will fold down that is held up with Velcro. Behind that you will find a rubber insulation that is mostly cut and looks like a door, but not all the way. Carefully cut the rubber to remove the piece. Now you will find a metal wall, but there is a large piece that is tack welded on. I got turned around and kicked it with the bottom of my foot and got 3 sides loose. Then a softball bat knocked the final side loose. Pull that out and trash it, the final barrier is the insulation that is held in place with plastic clips that can just be pushed down. After that you can a pretty large hole to work through and get the keys. Just put everything back in place other than the metal plate and you will never know anything was done.

SOURCE: bmw keys do not open doors remotely

hello there

you need to repalce the battery in the remote key.

Hope this helps, please don't forget to rate me.

SOURCE: My bmw x5 door handle will not open even the door

How did you get the driver's door unlocked. Your other doors should unlock by hitting your key fob button twice. Sounds like the door handle came disconnected or broken.