2012 Toyota 4Runner Owners Manual - Page 541

2-4. Using other driving systems Shifting between H4F and H4L Push the "UNLOCK" button and turn the four-wheel drive control switch to H4L or H4F. This can be done at any speed. The center differential lock indicator will turn on (H4L) or go off (H4F). CTH24AS017 Shifting between H4L and L4L