2010 Toyota FJ Cruiser Owners Manual - Page 188
2010 Toyota FJ Cruiser Manual
Page 188 highlights
2-4. Using other driving systems AUTO LSD system (2WD models) The AUTO LSD system aids traction by using the traction control system to control engine performance and braking when one of the rear wheels begins to spin. The system should be used only when wheel spinning occurs in a ditch or rough surface.