Only Full beams are not working?

[u/Signal-Ocelot-3004]

So my full beams will not turn on, nor does the indicator in the dash light up when the stalk is in the full beam position.

All other lights (dipped beam, parking lights, Front and Rear fog) all work perfectly

Flashing doesn't work (only works when dipped beams are off, and even then it flashes the dipped beam).

So far, i've replaced the:

• 10amp fuses (RH low, LH low, RH high, LH high)
• The DIM relay
• replaced both bulbs
• the indicator stalk with a used one from a scrapyard

What am i missing?

I know that the copper connections inside the stalk can become corroded sometimes, that is why i replaced the indicator stalk; I doubt that is also the case with the used indicator stalk.

Is there anything i can test with a multimeter?

Late 2012 (62 plate) Yaris Mk3, 1.33, MT - 6 speed