Checking trailer lights
When connecting a trailer, you should make sure that the trailer lights are fully functional.
You can start a trailer light check via the centre display. While the check is in progress, you should be standing at the rear of the trailer to observe if the trailer lights are working.
Connect a trailer to the towbar.
Press the car symbol 
in the bottom bar and go to Settings.
in the bottom bar and go to Settings.Go to .
Press Start.
Leave your car, stand behind the trailer and check that all the trailer lights work as expected.