Pull the bulbs and check the sockets for power at the low and high beam points; if you have power at the two points check the bulbs for continuity.
If you have power and the bulbs are good the next sep is to check the relays, which one I do not know for sure off the top of the head.
How are the low beans, are they bright, not so bright ?
Double check the ground wire for the headlight assembles (both of them), just a good measure.
If there is power, the grounds are good and the relay work, then you will need to take this up a notch and check out the switch assembly in the steering column.
It is an easy thing to get at, the only problem is the schematics and which wires.
This Module controls high/low beam, directionals, flashers and wiper systems and all the wiring in one large connector.
My unit had a pin pulled out and a main connector clip broken and it caused me a lot of trouble for a while.
The pin device that holds the pin in the connector had broken and caused this parking lights to be intermittent; how the connector clip broke is beyond me but all part of the overall problem.
I secured the pin using silicone and the connector using ty-wraps; there was enough room even though it is a tight fit.
From here check for power in and out, if all is well you will need to improvise as needed.
Sorry I can't take you further than that.
Luck,