WARNING: This page is about a different car, the 1996 Mercedes-Benz E300. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Inline Fuel Injection Control Module (IFI) Connector Terminal Identification (1 Of 2)
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Fig 2: Inline Fuel Injection Control Module (IFI) Connector Terminal Identification (2 Of 2)
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Fig 3: Mercedes 38-Pin Data Link Connector Terminal Identification
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Fig 4: OBD-II 16-Pin Data Link Connector Terminal Identification