According to manual , Start car or turn key to on,
and enter code on radio, FYI this is a very common problem with the Vigor factory radios the Display does not allways light up,
It could be his Radio Display is shot (this happened to mine) and I could not see what I was doing .My radio worked ,but I could not see what radio station it was on,
I finaly changed out the radio to an aftermarket one.
Another thing to be aware of , is the Factory Alarm system is sometimes very difficult to disarm. Specialy if its key in door system. But thats a hole different subject.