i said you need the iso/wiring harness from the back of the avx1 into the leon wiring.
I sent you the links t look at, you have instructions, if you have plugged it str8 in then you obviously had the harness. I helped you with info you MAY have needed IF you didnt have it.
Moving forward if you have any queries speak to a professional or sort it yourself. I offered
help i didnt make you buy it.