Funny here in the states the EX with the Luxury package has the TOD and we were told as explained in the sales brochure that the system is an AWD system somewhat to what Ssubaru uses. At start off the system goes into a 50/50 split of power but after reaching second gear in the automatic tranny it reverts back to 90/10 rear drive. When slippage occurs power is transmitted to the wheel slipping either side to side or left to right. On braking down hill there is a surge that occurs in which you fell the tranny and engine work together to brake. This model here in the states does have a switch to electronically engage into 4wd lo at this point the Sorento drives like a tank and goes through our New England snow very capable.