Frustrated to find out what is causing the radio to stop working. I have a 2011 Civic 1.8 i-VTEC and when I start up the display shows 'Radio' 1 but as soon as any control is touched it displays '1 AF  ON'  and none of the switches or dials work. The fuses are checked and seem fine, then all of a sudden it will be working again and now it doesn't work at all.

hello, Pete, could be the problem be sticky buttons on the radio, causing untouched selection 

 

Thanks for getting back to me but it's not that. Had the radio removed from the dash and it has been thoroughly examined but nothing has been found. I'm replacing the battery as a Honda dealer said it could be caused by dead cells but I can't see how. If this does not work I have decided to replace the whole unit.