I recently purchased a 2018 Honda Civic Hatchback Sport Touring, & have been busy learning the many functions & "hidden functions" available to me. One I couldn't seem to locate in the owners manual, was how to dim the instrument panel lights. I am happy with the factory default setting, but wanted to know how anyway. This thread gave me the proper hints. It IS done with the same "stalk/stem knob" (upper right hand corner) that resets the trip odometer miles. It will NOT work in daylight, at least for me. Tonight, I tried it in dark night conditions, & low & behold, it DOES work to change the instrument panel brightness/dimness. It also changed the brightness of my GPS screen. As I turned it counter clockwise to dim it, a message came on momentarily that said "Please Wait", followed then by a horizontal bar graph, that went up or down as I turned the knob shaft clockwise (brighter) or Counter clockwise (for dimmer). My headlight switch was in the Auto mode when I did this with the car running. I didn't check to see if it also worked in headlight or parking lights switch modes. I assume it would. I hopes this helps anyone else wanting to know.