Radio In-Opp / Radio Code

[machine]

Hi all,

Been having troubles with my 16:9 sat nav screen in that I couldn't get it to illuminate and display. Finally sorted that by bypassing the Traffic master.

Now I'm struggling to get the radio to come on. The orange light doesn't illuminate when I press the volume #####. No sound, no radio channel options now nothing. Doesn't even highlight or let me access "code". Any ideas what it could be now?

I'm told it could be the radio module so how do i test this?

Do I need to enter a code now it has had a new battery Etc?

Regards in advance

[machine]

Just reading the hand book. Does it have to be set to split screen?