Check the OVP fuses. OVP is under the panel in the engine compartement, against the firewall, passenger side. Do a search in this forum for "OVP". I'm sure somebodt has posted a picture of one.

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