Look at the housing in the engine compartment where it says "Battery in Trunk." There is a round cap about 2" in diameter. Unscrew it and you will see the 38-pin connector.

The picture in this link shows the housing with both the round cap and the rectangular cover that houses the various modules removed. http://www.k6jrf.com/MB_X11.html Look for X11/4.

We are talking about a 1993 400E, right?

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1993 400E, 256,000 miles (totaled)
1994 E420, 200,000+ miles
1995 E420, 201,000 miles