This question depends highly on which type of key you are using. If it is in the E46 range, then take a pocketknife and trace it along the ridge that follows the perimeter of the key. Then, the key will break off into three sections: the top (buttons), the middle (green chip), and the bottom of the key. To put it back together, simply align the pieces, apply glue (not toogenerous), and click in place.
**Only pursue this answer if you are 100% sure of your own capability to handle the items above without any liability to myself. This information worked for me and allowed me to replace my battery ($2) without replacing the whole entire key (about $230).
Surely there is a key lock on the door where you can insert the key and open the door.
check the glove compartment, i think BMW put a lever in there that will open the back(not sure though)
You turn the key to the left,once you feel that it has stopped; if the trunk has not popped open then turn just a little more and it will pop open.
looks like you've got the wrong key and remote
After you turn the key, you have to push in the trunk button (the key is in), that should open it up.
The BMW hood latch release lever is located on the floor, next to the drivers seat. Pull the lever upward to release the hood latch.
My Friend push in the silver knob that the key goes into.
If your key won't work to open the doors or trunk of your 2003 BMW 540, it could be due to a dead key fob battery or a malfunctioning key. Try replacing the battery in the key fob first. If that doesn't work, you may need to use the physical key hidden inside the fob to unlock the doors. If you're still unable to access your vehicle, it might be a good idea to consult a locksmith or a BMW dealer for assistance.
BMW Open was created in 1900.
A new key for a BMW can be obtained by contacting your local BMW dealer. They will contact the factory in Germany that will make you a new key for your BMW.
as long as the car is unlocked, you should be able to push in where the key goes and it shoudl open.
use the button insode the drivers door