The illuminated door sills fit over the top of the existing ones, which you have to drill. The illuminating section is wired into the door contact switch. More than that I do not know. Try private messaging David C Klasse, he has them on his c280 (although I recall he had them installed at an outfit called Circuit City). There have been lots posts about illuminated door sills in the Tech Help and Open Discussion forums; try a search using "illuminated".

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JJ Rodger
2013 G350 Bluetec
1999 SL 500
1993 E300 diesel T
1990 190