The electronics of the Freelander 2, also known as LR2 in the USA and code named L359 are comprised of around 25 separate ECUs (nodes) which are all interconnected by a number of 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 affects 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 fiber 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 Combined Integrated Control / Head Unit on vehicles fitted with Low Line Audio equipment and through the Integrated Control Unit on those vehicles fitted with High Line Audio equipment.
High line or Low Line Audio
As mentioned the Freelander 2 has 2 options for Audio equipment most noted by the head unit in the centre of the dash board. The High Line Audio head unit has a Slot for a CD above the LCD display panel and the Low Line audio head unit has a slot for the CD below it's LCD display panel.
For more detailed information about this ECU please click here.