Hi,
I have a 2006 A6 Avant 2.0TDi SE, and over the weekend it seems to have developed a poltergeist in one of the door speakers!
The passenger side rear door speaker is giving out a constant hissing and popping noise - even when the ignition is off and the keys removed! That door is where our baby normally sits, and I know he definitely hasn't spilled anything on it (and hasn't been sick on it either). That window is never open so its not like some rain water has got in and worked its way in to the speaker either. Has anyone got any ideas??

I don't know if the hissing stops after a while as I havent sat in the car for any length of time with the ignition off yet. But, each time I have opened the door over the weekend to see if it has stopped its still there. Obviously, I'm worried that this will drain my battery, or cause a short somewhere.

Thanks