I recently purchased a Pre-owned 2007 XC90, and noticed that there is a distinctive clicking noise coming from the Aux jack. The clicking only occurs when no devices are plugged into the jack. Being as **** as I am about my vehicles, I am trying to find a way to eliminate the clicking. Since the vehicle is still under warranty, I've taken it to a Volvo dealer to have it looked at. I believe the problem is interference or noise in the Aux line, most likely through the center console where it's housed. The dealer has given similar explanation but has not come up with a solution. Has anyone out there with an XC90 with Aux jack experienced a similar problem, or know of a definitive solution??

Much Thanks!!