This entire article is clickbait.

- Headline "My new car has a mysterious and undocumented switch".

No, this is not a new car. This is a used car. Finding undocumented switches in a vehicle someone else owned is very common. People modify their cars all the time. Finding an undocumented switch in a new car would be wild.

- "And that’s how the search comes to an end. After a bit of perseverance I figured out what it is."

You literally took your car to a dealership, and the mechanic told you what it was. This ENTIRE ARTICLE boils down to this statement. You did the bare minimum to investigate what it was: took the panel off and confirmed that the wires went __somewhere__.

How does this get upvoted so heavily on Hacker News?