How do you unlock radio for Vauxhall Corsa with code?

Switch on ignition then switch on radio whilst holding down the AS button. A number indicating how many code tries you have left followed by 4 dashes should then be displayed (e.g.10 - - - -) Enter the code using keys 1-4 i.e. if your code is 5312 then press 1,1,1,1,1 to enter "5" then 2,2,2 to enter the "3", then 3 to enter the "1" and then 4,4 to enter the "2"

Remember to hold the AS button while switching on the radio.