Fuse box problems

HiHi from Sweden.

The car is an Octavia estate 2006

I have started to install my new carstereo and i ran in to a problem. I get a noise in the front left speakers, Dont even have to have them conected to something..

But when i pull the fuse the noise goes away.. And the fuse is for the "Central control unit, Left main headlight". Have tried what i can think of, but now im stuck and need more brains to figure it out.

And the noise is only on the left side and not the right side. And its not the amps, rca's or the stereo have them all disconnected and the noise is still there, maby abit less but still there untill i pull the fuse.

//Patrik