The key as a means of security
The electronic anti-theft system increases the level of protection for your BMW against theft. It allows you to start the engine only with the keys to your car. At your request, the electronic circuits of individual keys can be blocked at the BMW workshop (for example, when lost). The engine cannot be started with a locked key.
The electronic circuit is built into the key. The electronics in the car exchange, through the ignition lock, individual for each car and constantly changing signals with the electronic unit in the key. Ignition systems. fuel supply and the starter are turned on only if the key is recognized as "mine".
If the key is handled carelessly, the built-in electronic circuit may be damaged. In this case, starting the engine will not be possible.