The electronics of the 2010 Range Rover code named L322 are comprised of around 25 separate ECUs (nodes) which are all interconnected by high speed communication Busses. This allows them to interact with each other at high levels of interdependency, sharing information vital to their operation. A fault in any one ECU or its removal often has knock on effects in the others, with them storing bus error or missing node fault codes. Most of the ECUs use either a High speed (500K) or Medium speed (125K) CAN BUS, which are both wired to the Diagnostic socket, these are also interconnected by the Instrument pack which acts as a built in gateway between the two busses. However the ECUs related to information or entertainment that might additionally have to exchange video or audio data use a special fibre optic bus called the MOST BUS. This BUS is not connected to the diagnostic socket but is connected to the Medium speed CAN BUS through the main Audio Head Unit which again acts as a gateway.
For more detailed information about this ECU please click here.