A lot of readers here, and on Reddit seem to be misunderstanding the situation. The way I understand it, this car was taken in by a garage for 'seat installation'. I presume this means after market seats. The car disabled itself during installation. The OP assumed due to an anti-temper device, but it could have been any failure mode. Most modern cars with airbags will have sensors in the seats to disable some of the…
I'm pretty sure that that's exactly what it means. What happens when someone steals the manufacturer's authentication keys, or gets on to the manufacturer's VPN?