FM Static when the defrost button is on

[ELonGrad97]

Driving into work this Am in the pouring rain, I turned on the mirror/rear window defrost button and got quite a bit of static through my factory FM radio. I turned the button on and off and it was obvious the button was the issue. Anyone else have this issue and is there a way to fix it?

 

[Se7enRed7]

My first thought is it sounds like it may be a grounding problem.

 

[ELonGrad97]

I'm having Best Buy install XM and an iPod module, so maybe they can look at it while they're in there. With this on/off snow/sleet/etc., it's getting really annoying!