There is a solid blue wire coming from the back of your after market radio's harness that is marked remote turn on.... You need to connect that wire to the pink wire on the stock harness coming out of your dash leading to your stock radio... (there are two wire harnesses plugged into the stock radio...its the smaller harness that has 4 wires and is plugged into your stock radio, its where the pink wire is located...) once you connect your blue wire to that pink one you'll have sound.