The four wheel drive can be engaged and disengaged with the engine running whether the car is parked or is in motion.

A special device automatically prevents engagement at over 55 kph but the command memorises the driver's intention so that engagement happens automatically as soon as the car's speed drops below 50kph with no need to press the button again. Once engaged, the rear wheels remain engaged, even above 55kph.

In order to prevent the free wheel actuators being stiffened or blocked by snow, ice or mud so that the rear wheels cannot be engaged, four wheel drive is automatically engaged each time the engine is switched off and then automatically disengaged when it is switched on again.