2009 Toyota FJ Cruiser Owners Manual - Page 192

2-4. Using other driving systems 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. 170