All-wheel drive lock mode can be used when a large amount of drive power needs to be applied to all the wheels, such as when the vehicle gets stuck in mud and you need to free it.
Press the switch.
The torque of the engine is distributed to the rear wheels to the maximum extent possible in accordance with driving conditions.
Pressing the switch again cancels all-wheel drive lock mode and returns the dynamic torque control awd system to normal mode.

All-wheel drive lock mode can be operated when
All-wheel drive lock mode
Things you should know
Driving assist systemsIf a warning light turns on
or a warning buzzer
sounds
Calmly perform the following actions if any of the warning lights
comes on or flashes. If a light comes on or flashes, but then
goes off, this does not necessarily indicate a malfunction in the
system. However, if this continues to occur, have the vehicle
inspected by your toyota dealer.
Warnin ...