Seat Mii Electric lighting fault

I had a similar lighting issue with my Skoda Octavia a few years back. The lights would flicker intermittently. Have you checked the fuse box? A loose or corroded fuse related to the lighting circuit can cause all sorts of weirdness. Also, try wiggling the wires going into the light switch connector. It's possible a wire is partially broken inside the insulation.

Interesting, the fuse box is something I didn't consider. When you say 'wiggling the wires', do you mean individually at the connector? I'm trying to picture exactly what you did with your Octavia. Was the dimmer switch also affected in your case?

Yes, I meant individually wiggling the wires at the connector while the lights are on, to see if you can replicate the fault. In my case, the dimmer switch wasn't directly affected, but the overall lighting was erratic. Ultimately, I couldn't isolate it myself and ended up taking it to a workshop. They found a corroded pin in the headlight switch connector. Given the error code you're getting, it's probably best to get it properly diagnosed.

The workshop confirmed a faulty connection in the headlight switch. They cleaned the contacts and secured the plug. Total cost was 95€. Thanks for the input, it helped me focus my troubleshooting.