Headlight Problem

check your multi function switch or a short in the wiring system. maybe a bad ground is corroded. If you have daytime running lights the module may be interfering with it so have it scanned for codes

Thanks a lot.
The mufti function switch should be OK for I changed to another one, it still has the same issue. I will check the ground and the wire connection.

I am having the same issue with my 2002 Subaru, was the ground the issue and if so how would I go about finding the problem?

Thanks

When the headlight stops working or flicker use a test light to check the power, grounds and relays. here are guides and the headlight wiring diagrams so you can see how to test and system:

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

and

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Check out the diagrams (below). Please let us know what you find. We are interested to see what it is.