2010 Toyota 4Runner Owners Manual - Page 259

2-4. Using other driving systems Rear differential lock system∗ The rear differential lock system is provided for use only when wheel spinning occurs in a ditch or on a slippery or rugged surface. The rear differential lock system is effective in case one of the rear wheels is spinning. Press the switch to lock the rear differential. At this time, the rear differential lock indicator will flash. Wait a few seconds for the system to complete operation. After the rear differential is locked, the indicator will stop flashing and remain on. To unlock the rear differential, press the switch again. 2 When driving CTH24AS056 ∗: If equipped 235