A gauge cluster, the rear lights (brakes, reverse, and turn signals), the HVAC system—just about every electrical part contains a module that listens to the CAN-Bus network for information that ...

Note that almost any modern MCU (it just needs one UART port) is CAN-bus capable. Pair an arduino, blue-pill or what-have-you with a $1.50 MCP2551 off Digikey (along with a few passives and a ...