1997 Toyota 4Runner Owners Manual - Page 87

Rear differential lock system ! CAUTION Do not use the rear differential lock in the conditions other than above. Large steering effort and careful cornering control will be required. The rear differential lock system is provided for use only when wheel spinning occurs in a ditch or on a slippery or ragged surface. This differential lock system is effective in case one of the rear wheels is spinning. Before using the rear differential lock system, first shift the front drive control into "L4" with the free-wheeling hubs engaged to see if it works. If this has no effect, additionally use the rear differential lock system. To lock the rear differential, push the switch. Be sure to stop the wheels before locking the differential. Vehicles with manual transmission-For easy locking, depress the clutch pedal, push the lock switch and slowly release the clutch pedal. The indicator light will blink when the switch is turned on. Wait a few seconds for the system to complete operation. After the differential is locked, the light will stop blinking and remain on. 86