Originally Posted by Mayhem_3
It is kinda nice to have that sensor so if its dark the lights come on automatically. Have had the car 3 days now and don;t even have to touch the light ***. Kinda nice so you don't forget to leave the lights on.
Whoa, time out here, folks. There are two different automatic lighting systems in the car, and everyone is getting them mixed up:
1) The twilight sentinel uses a light sensor on the top of the dash to turn on your lights (all of them) after dark, to save you having to pull the switch on yourself, as well as provide an optional lights-out timer after you get out.
2) The Daytime Running Lamps (DRL) system runs the headlamps at reduced power (about 40%, IIRC) in daylight. On some models they do not come on until the car is in Drive.
The two systems are not the same thing, except to the extent that the Twilight Sentinel overrides the DRLs at dusk. It'* the DRLs that everyone is getting their panties in a knot about; the Twilight Sentinel is simply the usual automatic lighting system that GM has had for decades, and you can turn _that_ off by simply twisting the outer ring of your headlamp switch all the way clockwise.
The DRLs are not intended to be permanently turned off (though some vehicles I've driven such as a 2002 Bravada have an "Dome Light Override" button on the dash which, if pressed three times, will switch off the DRLs for that driving session). It is certainly possible to simply unplug them at a couple different places in the wiring harness (differs from one model to another) where it will do no harm and where later owners can simply reconnect them again if they want.