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Alright guys so I have a 99 C5 and my headlights aren't turning off. The bulb is on at all times. Even at off position and when I turn off car, the stay up and on. I tried putting them on twilight so they can go down on their own and it's still not going down or turning off. The dash light turn off like they're supposed to when I flip it to off, but the headlight don't turn off or go down. When I go slowly and put them between and the middle part they'll actually go down and like they're supposed to but it's really tricky to get it there because It'll flick to either the middle where the dash lights turn on and hazard. Or go to off and they pop back up. Any idea what it can be? The other two clicks work it's just the off position that's not working. They go down fine when they want to, that's not the problem. It's that they don't want to go down or turn off. Please help.
Try them in the 'bright' and low beam switch position, see if that affects them.
It could be the multi function switch too. The switches go bad in many different ways. The contacts inside that switch are a bit flimsy.