The most common failure. A pinout diagram will explicitly state if you are looking at the (the metal pins on the ECU itself) or the harness connector cavities (the plastic holes in the wiring loom). Pin numbering is often mirrored. The best datasheets show both views.
Always match the pinout to the 10-digit Bosch number, not just the car model, as manufacturers change hardware frequently. bosch ecu pinout datasheet best