I had the same symptoms--high beams but no low beams.

It turned out that my headlight grounds were corroded, thus the circuit was
not sending power out to the headlights. My headlight grounds were attached
to the ground cluster closest tothe front of the van behind the fuse box
(reach back further and
gently pull aside the mess of wires there to make a space to inspect
and clean these connections). Once the ground spades were cleaned up,
the two wires separated with new female spade connectors, and
reattached, the low beams and other lights all worked perfectly