Traveller electric brake light failure

Oh no, that sounds like a pain! I had a similar thing happen on my old car, though it wasn't electric. Did you check the fuses, just in case it's something simple?

Thank you for the suggestion. I did inspect the fuses, and they appear to be in good condition. Is there something else that could cause all three symptoms?

Hmm, if the fuses are okay and you're still getting those errors, plus the lights failing, it really does sound like the switch itself. Maybe best to get it checked out by someone who knows their stuff, just to be sure?

You were correct. I investigated further and found the switch was indeed faulty, likely due to a prior user error. Replaced it today; the error is gone, and the lights are functioning normally. Total cost: 0€ Thank you for your insight.