Hello, I'm Cam. Please include all the details about your issue so I can accurately advise you. I cannot see your vehicle so please be detailed.
For all the headlights to be affected you need to look at the whole power source,, and in this case it is the power supplied by the HEADLAMP Circuit Breaker in the dash fuse block.
So can you first test that?
See if there is full power to the circuit breaker or if there is a loose/damaged/overheated terminal there.
Thank You. I'll have to get back to you in an hour or so.