my corsa 52 reg cdr 2005 radio has display safe?

It looks as though the radio requires the Security KeyCode to be entered.
Instructions here

http://www.davidsonelectronics.co.uk/code_entry.htm

If you don`t have the Security KeyCode then ask another questing quoting MAKE , MODEL and ALL the SERIAL NUMBERS on the radio casing and someone may be able to calculate your code for you

RegWorts
June 2008