i'm working on a 2007 tl with a factory radio, but i get a engine noise on the sub,the thing is that when i open the door there is no noise only when is close but the rca converter is on the factory sub, I try everything, change the rca converter, the amp, the sub, rca, remote wire, ground, a i also put a noise filter and a didn't work, any sugestions please let me know..

 

it should be the noise cancellation mic. you have to disconnect it if i'm not mistaken.