dont know if there is a switch to manually adjust setting for a timer on the headlights to turn off
headlights stay on 5 minutes after i turn off the ignition on 2002 Buick LeSabre
My car has a 'twilight' slider adjustment on the dash to the lower left of the steering wheel. I believe that this slider changes the amount of time the headlights remain on after the ignition switch is turned off. If I set this slider all the way down, the headlights do not stay on.
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If you have your owners manual, check to see if this is a feature of your vehicle. I've seen this on other cars and you may be able to turn this off if it is indeed a feature.