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Unsure what you mean by "ignition barrel". If you're referring to the cylinder where you insert the key, you'll probably have to remove the steering wheel and disassemble the covers over the steering column.
If you mean the ignition key barrel ??? The key needs to be inserted into the switch assy and turned to (usually) the first key position, there will be a small hole in the barrel assy in order to press a locating pin (check replacement barrel for exact location). Press the pin and pull the key assy from the barrel assy. ( door locks can be coded to new key also) Good Luck
order a new ignition barrel from your local BMW agent before your lock packs up all together and you will have an even bigger problem, to remove your barrell turn your key to the first position then insert a 1.2mm rod or drill down the little hole in the edge of the chrome key slot to push down the detent that hold the barrell in, pulll out old barrell with the key then fit new one.
disconnect negative battery cable.place the ignition lock in the off lock position. remove the 2 switch mounting screws.disconnect the switch from the rod.disconnect the wiring and remove the switch.TO INSTALL.ignition switch installation for non tilt columns.move the the ignition switch slider to the off unlocked position move the slider all the way down.then back 2 clicks.the remote rod hole in the ignition switch slider should now be centered.insert the remote rod in the ignition switch slider hole and install the ignition switch on the steering column.tighten the attaching screws to 35 inch lbs.ignition switch installation for tilt columns.insert the ignition key in the lock cylinder and turn the cylinder to the off unlock position.move the ignition switch downward to eliminate any slack and tighten the attaching screws to 35 inch lbs.
on the edge of the ignition barrel there is a little hole, you must turn the ignition to the first click and insert i 1.2 mm rod (drill bit)about an inch down into the lock and puch back the ident then pull the key and barrel out together.
1) Disconnect and isolate Negative (Ground) battery terminal
2) Wait full 2mins for Airbag system capacitors to discharge (must disable airbag before working near steering column)
3) Insert key and turn to ON position (not start)
4) Release & remove cylinder barrel by pressing the release with a suitable tool (access through hole in the lower shroud)
5) Withdraw cylinder barrel from shroud and disconnect wiring loom from cylinder.
Installation of new barrel is the reverse of above.
It is a very small hole in the switch cylinder. About the size of a paperclip or maybe a bit thicker. It is to reset the ignition. If that does not work. you may have to replace the switch. try using aa paperclip or someting to push into the hole. Being vcareful not to force it too much. So it won't break inside.