There is no reset. They are controlled by the body control module. There
is a sensor on the dash that tells the BCM that it's dark enough to turn
on the headlights.
You need to check the fuse box to make sure that the fuse is OK, Then
toss a cover over the sensor and see if they come on. If not there are
some tests you can do with a scan tool to tell you what item is at fault.
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