My wife had someone try to jump start her 1999 E300D and inadvertently reversed polarity (how does someone do this when the cover on the inside fender has a BIG RED POSITIVE symbol?) resulting in quite a few blown fuses that I have all replaced.

Everything on the car works as it should with the exception of the driver's side window.

I know it's not the regulator or motor as I have replaced many of the both of them on practically every Mercedes that I've owned.

When I press the window switch a discernible clicking sound is heard from the plastic black box with a connector with wires going to it that is visible with the door panel removed.

Is there an electrical testing procedure that I can perform with my fluke meter to see if the plastic black box is the culprit?... I am an electronics tech so I know how to use a meter thoroughly.

Thank you,

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Currently Driving
2006 E320 CDI
1999 E300 Turbo Diesl
2002 ML500
1995 E320 Station Wagon


MBs I've owned
1997 E320 Assassinated by Pine Tree
1987 300E Wife Killed Engine
1981 300D Stretch Limo Total Loss
1970 250 Coupe 212,000 mi.
1974 450sel 184,000 mi.
1974 240D 377,000 mi.
1977 300D 204, 000 mi.
1979 280se God Only Knows!
1983 240D 130,000 mi.
1972 220D 280,000 mi.
1983 300SD 244,000 mi.