First , you will require the Security Code for the radio . If you don`t know it, then post another question quoting MAKE , MODEL and ALL the SERIAL NUMBERS on the radio.
I suspect that your radio is a BLAUPUNKT.
If it is , then it may unlock if you press 1 and 4 (or 1 and FM )whilest switching the radio ON....and this should reset the timer lock and permit entry of the code.
RegWorts
June 2008