You will need to put you MM onto 50V DC, switch on ignition, touch the BLACK lead from MM to metallic (unpainted) part of the vehicle, insert the RED lead into one of the three wires terminals on the female connector (White, Grey, Red).
Operate the wing mirror control for each motion (up, down, left, right).
When you get a voltage write down the motion and colour cable.
Then refer to your wiring diagram and cross reference with your findings.
Report back and we can help from there.
If you want to confirm the two blacks then you will need to switch on the heated window button, again Black Lead to metallic part of vehicle and Red to black cable.
Be careful not to short anything out, which realistically you should not be able to to do.
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