It will be the tang on the steering column that flicks the switch off when you turn it - it may have moved or somehow is not sticking out - remove the arm and look in the hole whilst turning the wheel and you should see what I mean. Don't turn ignition on whilst playing around here as you can set a fault code.
"If anyone disagrees with anything I say, I am quite prepared not only to retract it, but also to deny under oath that I ever said it." --T. Lehrer
"The secret of success is sincerity. Once you can fake that you've got it made." -- Jean Giraudoux