I just recently sold my jl sub and amp i had in my car. I have a 07 Si 4dr with the premium audio system bullcrap. My stock subwoofer has been turned off completely due to me previously having the JL. How do I get the stock sub to work again? I've included some pictures of how the audio shop rewired my stock sub. Is there a way I can just unhook some of these wires and my sub will magically come back on? PLEASE HELP! thanks.

 

Those extra wires they added are just "tapped" into your sub line for your line output converter, so just by looking at the pic, the stock sub is still technically hooked up. If it is not playing, your sub is either blown, or they have disconnected it at the stock amp, but I don't see why they would do that instead of disconnecting it at the sub itself.