1999 Lexus LX 470 Owners Manual - Page 360

CAUTION D Do not lock the 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 differential lock component parts. D Do not drive over 8 km/h (5 mph) when the differential is locked. To unlock the differential, turn the switch fully counterclockwise. Unlock the differential as soon as the vehicle moves out. For easy unlocking, slightly turn the steering wheel in either direction while the vehicle is moving. When the differential lock is disengaged, the indicator light will go out. The differential will also unlock if you shift the four-wheel drive control lever to "H". Never forget to turn off the switch after using this feature. To check the indicator bulb, turn the ignition key to the "ON" position, but do not start the engine. CAUTION Do not keep driving with the differential lock switch on.