UPDATE: If you place a new transmitter into service (either a replacement or an additional transmitter), it must be initialized: 1 Enter the vehicle and close the doors. 2 Turn the ignition key briefly (max. 5 seconds) to position 1 in the steering lock and then turn it back to position 0. Remove the key. 3 Press button 1 (refer to the illustration) and hold it. Maintain pressure on button 1 while rapidly pressing button 2 three times in succession within a period of 10 seconds. 463de028 4 Release button 1. 5 The central locking system activates and releases all lock mechanisms in rapid succession to indicate that the initialization procedure has been successfully completed. If the central locking system does not react, you must repeat the initialization procedure. If you possess additional transmitters for your vehicle (up to a maximum of four units), you must now initialize these as well. Be sure that no more than 30 seconds is allowed to elapse between the individual initialization procedures. Repeat steps 3 and 4 for each of the transmitters when doing this. The central locking system will confirm every initialization procedure as described in step 5. In the event of a system malfunction, please contact your BMW center. You can also obtain replacement transmitters here