Why are my headlights on my Audi 80 not working?

My Audi 80's headlights suddenly stopped working. I've checked the fuses and they seem to be fine. What could be the issue?

First, check if there is any moisture build-up inside the headlight casing. If there is, it may be causing a short circuit. If this is the case, clean and dry the casing thoroughly. If the issue persists, then it may be a problem with the headlight wiring or bulb.

Another potential cause could be a faulty headlight switch. You can test this by checking if any other lights on your Audi 80 are working. If not, then it is likely a problem with the switch. Consider getting it replaced.

If both of the above solutions do not work, then it could be a problem with the headlight relay. You can test this by swapping the relay with another one on your vehicle. If the headlights start working, then you know it's time to replace the relay.