Bmw with keyless entry

It sounds like the key needs reprogramming. When the battery was removed, it lost its memory. Visit the Dealership, and Auto-Electrician or an Alarm Installer.

All BNW's have remote key openers built into key, so what doesn't work, the manual lock, or the remote key, or both. When you say you don't have keyless entry, on a BMW the remote is the key.
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Probably the battery in the remote. Would check that first. Let me know if that works before getting deeper into it.

What is the problem? Keyless entry doesn't work? I would check the batteries in the remote first. Let me know if its something else. Good luck

everything keyless runs on frequencies if you removed the radio most likely it removed the keyless entry too especially in a beemer

if key fob not working change battery as to keyless entry module location and accessing it notify a dealer its part of ur security system and tampering with it can cause u to disable ur vehicle to the point of having it towed because ur locked out from starting it

You may have inadvertantly changed the settings in your security menu to disregard outside entry.

try pressing the keyless entry unlock button twice

you need to reprogram your remotcontrol by doing this
1, turne the ignation on and trun it off
2, prassed and hold the unlock botten and prasse 3 time the open botton
3, relesed all botten then the door well open and closed normal

the key you describe is for illuminating the locks and has no function for remote locking. You will need an aftermarket keyless entry kit to have remote locking. steve