Wiring diagram ME-SFI fuel injection and ignition system control module - PE07.61-U-2101-99MAD
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 in MODEL 164 ME 9.7.1, control unit N3/10, specification 2