You can’t always be so sure. The previous generation of the BMW MINI (designed in the 90’s, and which is, I think still being manufactured in some models) has a physical relay in the instrument pack for the indicator. The kicker? The output side’s not electrically connected to anything. It’s soldered down so it stays put. They used a physical relay just to make the sound of a relay. I wouldn’t be at all surprised if that was a common trick, the instrument packs are made by a third party who supply other car manufacturers as well.
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