On my 97 E420 if even just one of the two license plate lamps is out, I get the message on the instrument cluster. It took me forever to find the bad bulb the first time this happened. The S430 gives me a much more specific message to id the bad bulb.

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1996 C280 289K Traded
1997 E420 167K Traded
2001 S430 240K Traded
2010 E550 4matic 80K
2000 GMC Jimmy 198K Gone to Boneyard
2003 Camry LE 196K
2011 Mazda3 i Sport 31K