I have the same unit, like yours you cant change it from the settings ,its all controlled from the harness from the back of the unit ,if you were to cut the dimmer wire then your unit will be day light 24/7 , you can always just change the to day light from map settings when you turn on your lights ,the unit uses the day/night sensor on your car its has noting to do with the time on the car or use your fog lights ?