Using the station's setup keys from 1 to 0, enter the secret code number. The code you enter does not appear on the indicator. After entering the first digit of the code, the second field starts flashing, then the third and then the fourth field.
When the correct code is set on the indicator, the radio receiver switches to normal operation mode.
Note: After Z unsuccessful attempts to enter the code, the indicator shows a flashing message "CODE". After the 3rd unsuccessful attempt to enter the code, the waiting time increases to 15 minutes and the indicator shows the message "CODE PAUSE". During the waiting time the radio can remain on, after which the code number entry can be repeated.
If the waiting time is interrupted due to a power failure, a new countdown begins when the power is restored.
The original source of the article is on the website: bmwman.ru