If you are driving off-road or on snow and ice, select H4 (high speed, four-wheel drive) mode to engage four-wheel drive. The system can be switched from two- to four-wheel drive while crawling, . ... To shift from H4 to L4 mode, your Hilux Surf needs to be stationary
by default every 4x4 transfer power to rear wheels - it divides the power when transfer case is engaged in H4 or L4