Date registered: Feb 2008
Vehicle: 2004 W220 (S430) ; 2001 R129 (SL500) Sport
Location: Alabama Gulf Coast--formerly Charlottesville, VA
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Your car is a W220 chassis. If you scroll down the forum choices, you will see a forum for the W220. That room is filled with people who have some version of the same car as you and you'll more likely find specific help there.
I have a W220, but I have never had key difficulties, so I can't offer you any suggestions.
You might also try the electronics and telematics forum.
"Don't pick a fight with an old man. If he is too old to fight, he'll just kill you."--John Steinbeck