Title: Message
If you get it only when you're using the plug-in discman, there's only two ways it could really be introduced into the system (assuming you don't have this hum while you're listening to the CD player when it's NOT connected to the head unit): through the cigarette lighter or through the 1/8" plug hookup. Try eliminating both to see where your issue is.
 
Try using a different mini plug cable to hook the portable CD player up to the head unit. If that solves it, then keep using the better connection! If not, then it's coming through the power line plugged into the cigarette lighter. You can test this by using batteries instead of the cigarette hookup.
 
Once you figure out where the noise is coming in, you can then work to eliminate it.
 
Fred

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