Could be several things, first check all fuses also check that the headlights are not burned out by borrowing one that fits your car or if you have a multimeter you can check voltage on wires when you remove one headlight, if it still does not work check light switch could be gone bad.
Where are the relay switches on a 1999 Buick Century for the headlights
Check blower motor fuse Check to see if compressor is working
Remove the entire headlight assembly to gain access to the bulbs.
You contradict yourself. If your headlights are staying on during the day, then your DRL are working. What is your problem?
Try the switch that keeps the kids from opening the back window.
If the headlights flash on and off, there may be a problem with the bulbs or fuses. There may also be a problem with the battery connections or wiring.
push the parking brake ,before starting the engine
Check your light bults and connections, Check the ground. Get a volt tester and check for proper power. exc.
On the side of the door it says Lights and Parking lights are under it. But you push in the top knob on the driver side door.
2004 ford expedition front blower not working
cruise control went first. then the heater controls started working one minute and then off the next. It would come on and wouldn't shut off. Then the next item that started about the same time was the headlights flashing. change the ignition switch and solved all problems.
The cast of Headlights - 1999 includes: Darren Walsh as Angry Kid