The Toyota Sienna is a family minivan manufactured by Toyota at the Toyota Motor Manufacturing Indiana facility, in Princeton, Indiana, United States for the North American market. It replaced the first-generation Previa van in 1997 with a more conventional front wheel drive layout and shares a heavily revised platform with the Camry. Both the Previa and original Sienna were smaller than the other minivans they competed against, but a redesign in 2004 increased the dimensions to match those of its competitors. The Sienna is currently the only minivan in its class to offroad all-wheel drive. It was redesigned a second time for the 2011 model year. The third generation Sienna was put on sale in the US in February 2010 and is the first Sienna to ever receive a “Top Safety Pick” award from the Insurance Institute for Highway Safety.
Source: Toyota manual org