Yes, pretty much. There are usually 5-10 different CAN or FlexRay strings, each for a "topic" (Powertrain, Convenience / Controls, Sensors, Infotainment, etc.),

Yes, pretty much. There are usually 5-10 different CAN or FlexRay strings, each for a "topic" (Powertrain, Convenience / Controls, Sensors, Infotainment, etc.), all linked together by a Gateway module. Then for high bandwidth needs there is a separate set of buses, usually optical. For audio this has been fiber-optic MOST for years. For video it's a grab-bag of weird optical standards with occasional LVDS links being used for shorter runs. Besides lights which are still often driven by a centralized Body Control Module with a huge number of wires coming off of it, most analog wiring is localized to a much smaller area than in old cars. For example, now you'll have a Door Control Module which connects to the window switches, locks, mirrors, and window motor, instead of a bunch of wires running between the door and relays under the dashboard.