Remove the seat, find the white plug(it may or may not have a cap on it), use a wire or paperclip to jump the terminals. The switch must be on, doesn't matter if the bike is running. This will display the trouble code on the dash, C then a 2 digit number, C00 means there are no codes present. Any other code number can be searched and found on this site, it will help narrow down your problem. This is also perfectly safe and will not harm the bike, it's sometimes reffered to as Dealer mode.
The picture below shows the plug with the cap on, however it's much simpler to remove the cap for easier acess to the pins in the plug.
And welcome to the site, anything you need to know...someone here can help
Photo curtesy of Blanca Busa search engines, can't find somethin, bug that guy