you need to know your pin code, put this is by turning the ignition on,off,on,off within 5 secs (i think its on and off twice i will check when i get home) you then enter your pin as usual and then you have to go into the installer settings. Its a case of pressing buttons 1 and 2 a number of times. i will find out the exact number of times and combinations when i get home as i havent got the instructions on me at the moment.