Have you looked in the trunk behind the interior panels for the wire? If it was pre wired it would be in the trunk behind one of the panels somewhere.

I know that BMW Didn't always prewire for a changer, but not sure if benz did or did not.

Wiring the changer wouldn't be too hard. you would have to remove some interior pieces to run the wire it would probably not take too long to do it.

Alon

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'92 300CE - Sold
2004 C240 - 744 - C7 Wheels - Android Radio
2002 C320 - 816 - Sport Wagon