My 2007 Colorado LT is has an issue with the DRLs not turning on during the day. I did install the mod that re-routs the DRL to the signal lamps but I don't believe that that circuit is the issue because I replaced both relays and the lights are still not coming on, they come on at night and they blink when I lock the vehicle but they are not activating during the day and do not come on even when I turn on my signal lights manually. My guess is that the DRL sensor is bad but that is confusing to me because the headlights still come on at night...are there two separate sensors? I have read up on some posts and this seems like a common issue, if someone with some more knowledge could kindly direct me that would be spiftastic. Thanks!