Don't get too excited yet. It means it's wired to the wrong blue wire.
There are two blue wires on the Harness. One is power antenna and one is amp power.
Yours is wired to power antenna so sub only works when radio is on and the power antenna would be needed.
PLEASE do not send questions via Private Message, my inbox fills up too quickly. Post questions in the forum as a new thread so that other users can benefit from the answers. Use Private Messages for sensitive information only (VIN, Contact info or things you do not want the public to see).