it may be that u aint put it back in correct i had this to u need to ensure that u have put the little plastic bit into the clicker lol just take it out and refit it so its snug...

I had this problem when i sprayed my vent (drivers side) with the lights part attached when i put it back together was a loose conection and wouldn't work have a fiddle with the connections mate

Loose wire behind the switch?

the headlight switch has gone?

on my corsa the dashboard lights have stopped working, as have the sidelights front and rear, checked the fuse and its intact as are the bulbs, any ideas?
all other lights work fine.