Originally Posted by super10s

Here's another example where experience beats quoting manufacturer's biased info hands-down. Intelligent is an presumptive adjective that should be reserved for consumer use, not by the manufacturer. Any system that purports to be 4wd, yet shuts down when it can't handle the conditions is not intelligent, it's ridiculous. Toyota is on the verge of greatness with this design and deserves accolades for combining an all-electric rear drive with an electric-gas front drive and keep the combination going straight down the highway. However, that's about where the intelligence ends. Incorporating a design for a rear differential that never should have been copied from the dust bin of American design is a horrendous mistake and the leading cause of this design's failures. Furthermore, I pay no attention to idiot lights on my dash when I'm spinning in snow, but since you've never tried it yet maybe you should go on pontificating about the way it is supposed to work. I was going to tell you how my Highlander doesn't obey the "rules" about tire spin but I guess that's just real life information that is not relevant to the theory of how it works.