This might have been discussed, but I just got most of the bugs worked out with my system and they fixed the dimming of my Z1, but it only works when I turn on the lights manually. I have the auto headlights so I don't ever worry about switching on the lights anymore. Did they just hook up the deck to the wrong wire? Any info would help so that I can just go back and tell them what needs to be done.

What kind of car is it in?

My guess is they hooked the illumination wire up to the light switch and not the auto lamp module. What you may need to do is hook it up by the lights themselves or run another feed off the wire from the module that goes hot when the lights turn on.