Checking trailer lights

When connecting a trailer, it's always wise to make sure that the trailer lights are fully functional. You can run a check of them through the display.
Connect a trailer to the rear of the car.
Press the car symbol in the bottom bar and go to Settings.
Go to Controls → Lights and displays → Exterior lights → Trailer light check.
Press Start.
Symbol for trailer lights fault detected

If there is a fault, the associated symbol will signify this in the display.