So, I put the base in and got 2 green lights, then the seat in and a third and had the green light. But after that, all lights switched off. Do they remain green the whole time? Or once you've fitted correctly, the lights go out?
What seat do you have? I've only ever seen stickers rather than lights as such. So when it's in place, the green area of the sticker shifts into the window so it looks like a green 'light'. They stay green so you can check each time the child is in the seat
Mine has lights, it’s a maxi cosi. Yes they go off after a while I guess to save battery. As long as they lit up (mine beeps too) when you installed it that’s fine. I think mine red and beep differently if you somehow disturb it once installed.