My appologies, I read the schematic wrong... It doesn't appear there is one.
HEADLAMPS WILL NOT
SWITCH FROM HIGH TO LOW
BEAMS, OR FROM LOW TO
HIGH BEAMS
1. Faulty circuits between
multi-function switch and
instrument cluster.
1. Test and repair wash/beam select mux
and multi-function switch return circuits as
required.
2. Faulty switch.
2. Test and replace multi-function switch as
required.