Fuse, wiring, bulbs
Most likely a fuse or a bad ground.
It may be wired wrong.
My '88 Prelude Si 4WS had a short in the steering column. My "guys" pulled wires to a toggle switch that they free-placed in the coin tray. It gets hot . . . But, the running lights/brake lights work independently of the headlights!
Check the fuses and the bulbs.
in dash lights
On most vehicles, the low beam headlights are the outside pair of lights. This is true when the headlights are side by side. When the two sets of lights are stacked, the low beam headlights are usually on the bottom.
blowen fuse or lights check fuse first
Headlights, interior lights, parking lights,Headlights, interior lights, parking lights,
depends on which lights? inside over head? /Dash board?/Doors? /front headlights?/Flashers?/ turn signals?/ Backing lights?/ Parking lights?/ So which ones ? what Year??
Start by checking your fuses. Then bulbs. Then switches in that order.
Check the fuse for the headlights. It is probably open.