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Just put alligator clips on your tool leads and stick a wire into the 38 pins.
You want pin 1 for neg/blk, pin 3 for pos/red, and the odd color goes to the pin designated for the module you want to get codes from.
Those pins are here for your chassis 124.036
http://www.geocities.com/MotorCity/Downs/1039/mercedes/cs1000_mb.pdf
I would start with pin 4 [ page 29...]