I just went through the same thing with my 2017. You can't adjust the brightness (via the dash knob) unless it's completely dark outside, and the engine and the lights are on. My 2017 manual says to do it with the parking lights on, but that may differ with your 2018.Any member with a 2018 EX-L have backlit steering wheel controls that light up at night. Also climate control buttons. Mine are dark at night and can't see anything. I tried to adjust the brightness control and it does nothing.
Thanks for any help