Comment by PinguTS

Be careful messing with your (modern) car like this. It may work at first glance. In some time in the future you may not be able to unlock your car.

As mentioned in the article as part of the introduction, there were problems with those car regarding security. Especially with the Rav4 where a colleague, Ken Tindell, showed a very serious flaw: https://kentindell.github.io/2023/04/03/can-injection/

Because of this OEMs build in more and more security, like SecOC with Autosar and other similar things. More and more of those security feature depend certificates in the devices that have an expiration time. Those certificates needs to be rotated regularly. If the rotation does not happen, because of missing communication with the mothership, then the security will fail, which finally will lock you out of your car.

That will be true for all the coming luxury car models.

IRC, Tesla has something like this for years in their cars. They can be offline for a certain period of time. But when this runs out, you will be out of luck.