How do I change the length of time headlights stay on after engine is off?
It's actually an option called the twilight sentinel. There is a photosensor in the dash that sees how dark it is out and turns on the lights for you without you ever having to touch that knob on the left.
The fact that the lights stay on after you shut the car off only when it is dark is again, a safety feature, not a defect. They are on a timer that is adjustable by the slider on the bottom part of the headlight switch.
All of this is explained in the owner's manual, and most new cars with keyless entry are this way, at least from GM.
Been working on the same issue for a week. fixed it last night after research and trouble shooting. The head lights are controlled by the head light dial/knob on your dash on the left side of your steering wheel. With the knob pushed in, if you shut down your car, the lights should automatically shut off as well. Mine didnt so what I did was i turned off my car, disconnected the positive battery terminal located inside a fist sized red box on the right side of your engine. Then I took off the dash panels to get to the actual connection on the headlight switch/dial/knob. I disconnected it and put it all back together. It fixed the problem.It worked for me, maybe theres an easier or faster way of fixing it but this worked. Good luck.
Also, with the knob pushed in, after shutting down car and opening and closing the door, they should definitely shut off. While the engine is running and while in park, the dimming tab that slides left and right (under the knob/dial/switch) controls whether you want the headlights on or off if the knob is pushed in. Making it go all the way to the left controlls this. If you slide it left slowly, you will notice that when you reach the end there will be some resistance. If you continue pushing, the lights turn on or off. If you have the lights off, as soon as you put the vehicle from park to drive, the lights automatically turn on no matter what. If your engine is running and youre in park, pulling the knob all the way out turns the headlights on no matter what and they wont shut off until you shut down the engine and wait for about ten minutes. There is also a setting right in between the knob being in and all the way out. Just experiment and youll get it. Trust me, I was confused whe I first got my Riv. Hope this helps someone.
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