2008 Lexus LX 570 Owners Manual - Page 313

2-4. Using other driving systems Four-wheel drive system Use the four-wheel drive control switch and center differential lock/unlock switch to select the following transfer and center differential modes. n Four-wheel drive control switch "H4" (high speed position) Normal driving on all types of roads. "L4" (low speed position) Driving requiring maximum power and traction such as climbing or descending steep hills, off-road driving, and hard pulling in sand or mud, etc. 2 When driving n Center differential lock/unlock switch Lock the center differential when your vehicle's wheels get stuck in a ditch or when driving on a slippery or bumpy surface. Unlock the center differential after the wheels have been freed, or after moving to a flat, non-slippery surface. 247