Thanks for the replys
I managed to get it working
I have the extended harness i got with the converter, so i didnt mind cutting a few wires and splicing them with waygos tested and found something that would activate the sub but i have had to make a makeshift manual switch for now for the sub
And the converter works without power. ive had it powered up and it doesnt sound any diffrent.
Im going to get an android screen save myself some hassle
Thanks for the help