2009 Toyota 4Runner Owners Manual - Page 209

2-4. Using other driving systems Gently depress the accelerator pedal. Unlock the rear differential as soon as the vehicle moves out. To unlock the rear differential, push the switch again. n Locking the rear differential l When the rear differential is locked, VSC is automatically turned off. (The rear differential lock and VSC OFF indicators come on.) l The following systems do not operate when the rear differential is locked. It is normal operation for the ABS warning light, VSC OFF indicator and slip indicator to be on at this time ABS Brake assist system VSC TRAC 2 When driving n The rear differential lock is disengaged when l Turn the four-wheel drive control switch to the H2 or H4 position. Never forget to turn off the switch after using this feature. n After unlocking the rear differential Check that the indicator goes off. CAUTION n To avoid an accident l Do not use the rear differential lock system except when wheel spinning occurs in a ditch or on a slippery or ragged surface. Large steering effort and careful cornering control will be required. l Do not lock the rear differential until the wheels have stopped spinning. Otherwise, the vehicle may move in an unexpected direction when the differential lock is engaged, resulting in an accident. This may also lead to possible damage to rear differential lock component parts. l Do not drive over 5 mph (8 km/h) when the rear differential is locked. l Do not keep driving with the RR DIFF LOCK switch on. 185