I have a 2005 chevy silverado with the z110 with the 120 upgrade. I have tried hooking the wire up directly in the harness and to the dash lights. Still with the lights in the auto position (which allows for the daytime lights and then switches to the regular lights at night) the map screen will not switch to the dark map when the lights come on nor will any of the screens dim. If I manually switch the lights on then the map will inverse to the black screen but the others still will not dim. Is there a way to hook up the unit or a setting that I don't know of that will allow the system to work
