Opel Corsa security code

Have a ( old ) opel Corsa C here ZX12E.. with a lost security code, in op-com i get FFFF.. with other ecu, bcm, keyring, cluster i get 05FF.. the code that belong to that system was 0529 ( almost sure )
Is there a way to read / extract the code from the bcm ?( plastic box )

For help really thankfull..