Hi - I have a 1993 Cadillac Sedan Deville. Recently the twilight sentinel stopped working. i can turn the headlights on the conventional way, but I am curious as to what could have failed. Is it a switch or relay that turns it on? Where is the switch or relay and where is the sensor that detects darkness. Any help would be greatly appreciated. Thanks

Dan

The sensor will be a little black bubble on top of your dash.

Right, I think he'* asking what broke.