Is Bus
WARNING: This page is about a different car, the 2009 Land Rover Range Rover, 2008 Land Rover Range Rover, and 2007 Land Rover Range Rover. However, it is still accessible from the selected car via links, so may be relevant.
The IS bus is a dedicated Land Rover corporate network used to transfer information between the rear seat entertainment module and the two rear liquid crystal display (LCD) screens.