Hey Tsikoteers!

I have a buzzing problem with the aux in when my GPS/Media Player is connected. The sound from the input device is audible, but there's a heavy layer of static.

Now I'm sure the cable works, since it allows buzz-free playback from my MP3 player and celfone. The GPS, on the other hand, is also buzz-free when I use earphones or when I connect it to the aux in of our other car.

So it's the pairing of the device and my car's sound system that's the problem. If it's any help, my car is a Mazda 2, all stock. Can anyone point me in the right direction regarding what's at fault? Thanks guys!