What is the fuse or switch located in dash,,for the head lights, whay arent my h

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My parking lights wont go off, ive pulledfuse to keep Battery from killing it and causeing other problems, my blinkers work, and break lights work when pushing on break, but when turning the headlight on they dont work, only when holding it back on the high beam. So I changed fuse in the fuse box in the truck , boght light bulb for driver side10$, changed relay 38$, and still remain on, i think i could hear clicking under steering wheel when after starting it, when roll widows or doors open on top of when its buzzing. I checked the break pedal, that that seems to be intact, so im thinking could be switch for lights in the dash? My mother had simular problems with her ford, and hers was switch inr dash. im hopeing its not wireing Ive only owned for bout 3 weeks.

What makes this problem better or worse?

Havent found solution, and help

How long has your 2000 Nissan Xterra had this problem?

1 week