Wiring diagram ME-SFI fuel injection and ignition system control module - PE07.61-U-2101-99MAC
WARNING: This page is about a different car, the 2010 Mercedes-Benz ML450. However, it is still accessible from the selected car via links, so may be relevant.
ENGINE 272.967, 273.963 as of 1.7.07 in MODEL 164 ME 9.7.1, control unit N3/10, specification 1