This does not workYes incorporated in the headlamp control switch pod are two wheel like adjusters to the right of the rotary headlamp knob. If im not mistaken the one to the far right controls the dash brightness.
I just discovered that tonight. After picking up some wood at Lowes,I was backing with rear hatch open at night. The interior light were so bright I could not see where I was going. I end up unloading and then parking. Now I know what to do!Did you scroll the wheel all the way down and past the detent?