I had this problem with my c6 wich I sold over a year ago, but I think I remember what I did. The headlights were set to Auto and were coming on. I turned the lights to Off but then I had to change the display on the DIC to some other display ie tire pressure to oil temp or something like that. That would cause the dash lights to brighten. I would then switch the headlights back to Auto but they would stay off till it got darker. Hope this works with the c7.