I think that car is equipped with the 38 pin diagnostic socket. I would read the codes from pin 21 (Roadster Soft Top) and reset any fault codes that come up.

Here is a pic of the 38 pin location:



This is the circuit for the code retrieval tool:

http://members.aol.com/ajdalton7/ledtool.jpg

Just note that the banana plugs listed in the schematic will not fit the 38 pin adapter - they are too large.

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Daily Driver: 02 E430 4MATIC
In the family: '03 E500 // '04 ML500 // 64 220SE