Does your car start even though it asks for the code? It seems to me your CODE function on the OBC doesn't work anyways.
Basically the code mechanism functions to prevent auto theft. For example, you park. Turn your key to position 1, then hit CODE and punch in a 4 digit code of your choice. You remove the key. Next time you try adn start it it will not let you start the vehicle unless you punch in the 4 digit code.
The 4 digit code is punched in using the 1000, 100, 10, and 1 digits on the left side of the OBC. So the code is _ _ _ _
Say your code you set is 3758. To put in the code you first hit the 1000 button three times. then hit the 100 button seven times. then hit the 10 button five times, then hit the 1 button eight times.
1995 BMW M3 Turbo - Dakar/Black