We had a poltergeist issue with the door locks on our 97 C280 - turned out to be a busted pasenger side door switch - the one that controls the dome light.

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Thank You!
Fred
2009 ML350
2004 SL600
2004 SL500
1996 SL600
2002 SLK32
2005 CLK320 cabrio
2003 ML350
1997 C280 Sport