When i installed my pioneer nav unit the illumination was fine it work like it was designed bright with headlights off dim with them on. After having my DRL's activated when i had my fogs activated it is doing what it is supposed to do which is in the daytime when the DRL's are on my screen is dim and hard to see. Basically is there anyway to bypass that in the radio wiring harnes with the illumination wire without having the dealer turn the DRL's off and charging me for an hour of labor.