this post was submitted on 05 Mar 2024
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Tesla routes pretty much everything through the center console. I’m surprised they haven’t tried to route the blinkers through it.
It’s because their wiring system basically just daisy chains everything together with network cable. So it’s a lot less cabling, because they aren’t running six wires for six different systems. But it also means that when one system fails, they all fail in a cascade because everything behind that system in the chain is also affected.
That’s why automakers have traditionally used individual wires for each system, because they have prioritized safety over easier wiring; You don’t want your airbags to fail just because your wipers are having an issue, for instance. So each system is essentially isolated to its own wiring.
Tesla is a good example of people not understanding why things are done a certain way. Elon just saw modern wiring harnesses and went “lol that’s dumb just use network cables.” And on the surface it sounds fine, because it’s less wiring. But it fails to understand why each system is wired independently. And now Teslas have frequent issues with cascading system failures.
That's the case in all modern cars beginning in the 90s: Everything that's not directly mechanical is on the CAN bus. Not every single button individually, but button assemblies (the steering wheel counts as one), there's no wire going just for the blinkers through the wiring harness it's connected to the same bus that also carries signals for the brake lights.
Capacitive buttons are simply cheaper than mechanical ones, also, too many automotive designers seem to have no concept of haptics and UX they're in it for the sleek curves. Or, well, no concept of haptics that isn't about how satisfying the door closes, they still get that one right.
Tesla: bringing back token ring networks, one shoddily-built car at a time.