yes and yes it should work without a headunit.Is it just 2 screws behind the centre vents I need to undo?
Have you checked the fuse? My mates head unit wouldnt work in his metro, neither would his interior light.......he found the fuse for the interior light was blown so he changed it, interior light worked again and the head unit sprung into life too! Maybe its the same on corsas? If the bulbs are fine, it could be that, also those kind of things would be connected to the same fuse too I imagine.That's not good news....chances are mine is kaput then. Too dark now but will check tomorrow. My interior light needs sorting as well as the glovebox light. I suspect this is going somewhere......
EDIT: ie. I've checked the bulbs already.