Axxes ASWC wiring HELP on VW

[MeMo2 10+ year member]

I could n't find anything on their website . can u plz advice how to know which wire i have to connect to the ASWC wires.

I connected the GRD -

RED +

and i 've three wires left from my scosche wire harness. ALL BROWN

Scosche VW03B - Wiring Harnesses - Sonic Electronix

how can i know which one if for Vol + / -

plz help

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