Using Trailer Manoeuvring Assist
Requirements:
The vehicle has been started and is stationary.
A trailer has been detected.
The gradient is less than approximately 15%.
The electric parking brake is not applied.
Using Trailer Manoeuvring Assist
Engage reverse gear 
.
. Press button 
.
. The camera image is shown in the media display.
To adjust the articulation angle: select 
. Swipe left or right on the media display or touchpad to change the articulation angle.
. Swipe left or right on the media display or touchpad to change the articulation angle. or
To activate the straightening manoeuvre: select 
.
. The system calculates the articulation angle in such a way that the direction of the trailer at the time of activation is maintained. There is a short countersteering movement of the trailer while the vehicle is reversed, which then guides it back to the desired line. In this way, the vehicle is aligned straight with the trailer and, at the same time, the direction of the trailer is maintained.
Accelerate and brake as required.
Pay attention to your surroundings and be ready to brake at all times.