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Originally Posted by mwrbunny
All I've got is the stock navigation unit with a USA-Spec IPod Interface.
Truck is a 2006. I didn't notice any whining for the first 6 months....seems like it just started.
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I had the same problem when I had the Pac Audio iPod interface... my problem was mainly noticed when I would be playing the XM part of the factory stereo... it would humm real bad... going in tune with the alternator. What I did to prevent this was install a switch between the power of the iPod unit and the vehicle...
This would allow me to flip the switch when I wanted to use the iPod, thus causign the CD changer to be able to be selected, which was what the iPod sound came through... then if I didn't want to listen to the ipod, I would just flip the switch again, disabling the ipod interface, as well as removing the cd changer selection from the head unit. This fixed my problem and may work for you as well.
Hope this helps... Basically, you probably have several ground wires going to several different places, and the only solution to fix this would be to have all the grounds go to the same place, but sometimes with a factory stereo, that can be very hard to accomplish!