2010 Toyota 4Runner Owners Manual - Page 250

2-4. Using other driving systems Four-wheel drive system (full-time 4WD models) Use the four-wheel drive control switch to select the following transfer modes: CTH24AS016 H4F (high speed position) Normal driving on all types of roads. H4L (high speed position, center differential locked) For when your vehicle's wheel gets stuck in a ditch or when you are driving on a slippery or bumpy surface. L4L (low speed position, center differential locked) For driving requiring maximum power and traction such as climbing or descending steep hills, off-road driving and hard pulling in sand or mud, etc. Center differential lock indicator Low speed four-wheel drive indicator 226