Chances are its your headlight switch if the fuse is good. It can also be your dimmer switch.
Not usually. Disconnect it and see what happens.
Check that you are not turning the wiper switch to "delay." I had problems with my 1997 jimmy wipers not working. Check the wiper control box, relay switch, Mine works now.
The switch or the relay, check the cheapest, or simplest thing first, which could be the relay, but the symptom points more to the switch.
The circuit is simple .... headlamp bulbs to relay to fuses to switch .... ttroubleshoot those items and you'll find the glitch
More than likely a defective Flasher Relay. Replace it.
Yes, there is a headlight relay,
I had a similar problem with my 2002 Siena 1.6. It was a faulty relay situated in the main fuse box alongside the steering column (can't recall which relay it was but the diagram on the fuse box lid indicates). It also affected my headlights on low beam.
Blown fuse? Bad earth maybe. most likely the fuse. Fusebox located to right hand side of steering wheel. There is a headlight relay that is prone to failure.
relay in the hood fuse box HDM relay (Headlamp Driver Module)
Bad relay? (points burned and not releasing)
Headlights are on a relay. It may have fused shut. The relay maybe in with the fuses. Some have a delay going off which may have failed.
Headlights need to be on for starters. Blown bulb, relay, or switch.