I've been thinking about getting a new car - Subaru - and started doing research on all the stuff that goes into them these days. Apparently, all the separate wiring that used to connect various sensors and devices to gauges or lights on the dash have been been replaced with a local area network - two-wire twisted wire pair - that allows the various controllers on the car to "talk" to each other.
Depending on how devices are registered onto a CANBUS, I am thinking that it might be possible to create a custom device that hardwires into the twisted-pair at some point, and if the device registration is plug-n-play, then that custom device should be able to register itself and start (a) sniffing traffic from other devices, and (b) issuing its own traffic - for example, mimicking traffic from other controllers on the CAN - which might be a handy way of permanently turning off the PoS auto start/stop feature, or at least turning it from on-by-default to off-by-default without having to remember to hit the "off" button each time one starts the car.
Sniffing the traffic on the CAN should also allow one to write one's own digital dash to get more in-depth data about functions one cares about, which might not have been displayed the way one wants on the car's built-in dash.
