Gotta be the multi function switch or the ICM. ICM failures are rare, but that switch assembly has failed a lot recently.
Did you try "Flash to pass"? If that works but the high beam position does NOT work, it's the multifunction switch for sure.

If neither work, it could be either the ICM or MF switch. The service manual gives you pin-outs of both items, altho I'd bet getting to the connectors to measure what is there is going to mean taking the bottom of the dash apart, as in the "Sticky Key" fix.