2011 Honda Civic LSX Line out converter noise

[mobileaudiodzyn]

I'm having a problem with the LOC that I installed into the factory stereo. Regardless of which speaker I connect the LOC to I get the same problem...when I have the door open everything is ok, however, when I have the door closed, it seems like a signal gets sent to the sub amp and it produces bass even with the stereo off. The bass comes and goes when I rev the engine and as soon as I open any door it stops. I've also tried moving the ground to different locations. I was thinking there might be some kind of feedback causing it, but I need some help with this. Anybody have any suggestions? Let me know if you need more detail.

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