I have an 03 SL 500 that I have my Ipod hooked up thru the glove compartment jack,when I have the ipod plugged in and its charging thru the belkin charger thats plugged into the cigarette lighter I get a high pitched whine thru the channel,its hard to hear but when no music is on ,like in between songs it,s really noticable,if just the Ipod is playing under its own power there is no other interference