RCZ Lighting System Fault

Sounds frustrating! I had a similar problem with my old Audi A4. Random electrical gremlins are the worst. My dashboard lights were going crazy, and it turned out to be a faulty connection in the headlight switch wiring harness. Did you check the cable and plug connections of the component? If there is a bad connection, you will have issues with the lights. Have you inspected the wiring for any signs of damage or corrosion?

I have visually inspected the wiring harness and connections to the headlight switch, and I did not observe any obvious signs of damage or corrosion. Was the issue immediately apparent upon inspection, or was it more subtle? Perhaps requiring a more thorough examination with a multimeter?

In my case, it wasn't immediately obvious. I only found it after wiggling the wires while the car was running and seeing the lights flicker. It was a very subtle break in one of the wires within the connector itself. At that point, I tried to fix it myself, but it did not work for long. If you are unsure and don't want to spend a lot of time troubleshooting, it might be worth taking it to a workshop to have them diagnose it properly.

Based on your advice, and the fact that the error code specifically points to the headlight switch, I will take it to a trusted workshop for a proper diagnosis and repair. The estimated repair cost of 95€, considering the potential for defective cable or plug connection, seems reasonable. Your insights were invaluable in helping me make this decision.