The BMW E53 series is the basis for the 1999 through 2006 BMW X5 Sports Activity Vehicle (SAV). Production ceased September, 2006 and has been replaced by the BMW E70. The E53 was developed at a time when BMW still owned Land Rover and as such shares many components and designs with both the Land Rover Range Rover L322 model (specifically the Hill Descent System and Off Road Engine Management system) and the BMW E39 5-series (specifically engines and electronic systems). The entire in-car entertainment system (Radio Function, Navigation System, Television and Telecommunications systems) are shared with other BMWs and L322. As a result the X5 model earlier models and L322 can be easily upgraded with the newest BMW technologies.