See also:

Rear doors
Push the locking lever on the rear doors down. The door can now be opened from the outside only. ...

Ventilation in rear
Ventilation in rear 1. Use the thumbwheels to smoothly open and close the air vents 2. Thumbwheels to adjust temperature in upper body region; can be adjusted separately for left and right: ...

The concept
The system is functional at speeds beginning at approx. 20 mph/30 km/h. It maintains the speed that was set using the control elements on the steering wheel. The system brakes on downhill gradie ...