I'm having trouble activating the cameras. Whats the best way to get them on. Hey Mercedes doesn't work when I need it or doesn't understand what I want.

 

Press the vehicle function button located near the touchpad (its the button that looks like a vehicle, right above the star button). Also cameras should activate automatically when parking sensors detect something in close proximity.

 

Tommy is correct but you have to keep your finger on button, if you just touch it the short cut icons appear on screen.

 

I can't seem to get them to work. Only in reverse and only the rear cameras.

 

So, stupid question, but are you sure you have the DA3 Parking Assistance Package on your build? That's the US code; not sure where you are (add location to your profile)