If you have Navigation, Go on Menu, then Setup.
Then go to Vehicle Customization and then Light Settings. It should be under there. If you can't find it, let us know.
Its possible that if you bought your car used, someone could have put it down to 1 which is the lowest setting. Just turn it back up to 3 and you should be OK.
If its already on 3, go to 4, see if you are satisfied and if not go to 5.