This is the best summary I could come up with:

A group of researchers said they have found a way to hack the hardware underpinning Tesla’s infotainment system, allowing them to get what normally would be paid upgrades — such as heated rear seats — for free.

This may also give owners the ability to enable the self-driving and navigation system in regions where it’s normally not available, the researchers told TechCrunch, though they admitted that they haven’t tested these capabilities yet, as that would require more reverse engineering.

“We are not the evil outsider, but we’re actually the insider, we own the car,” Werling told TechCrunch in an interview ahead of the conference.

Werling explained that what they did was “fiddle around” with the supply voltage of the AMD processor that runs the infotainment system.

With the same technique, the researchers said they were also able to extract the encryption key used to authenticate the car to Tesla’s network.

I’m a bot and I’m open source!

Good. Fuck any car company that paywalls features.

The technique feels similar to that video from a few weeks (months?) ago where the private key was read from the led of the card reader