For bench connections, the Simos 3.3A generally requires connections to power, ground, and a communication line (K-Line). Note that pin numbers may vary slightly by specific engine code (e.g., AEH or AKL), but standard bench-reading pins typically include: Pin 3 +12V Switched (Ignition): Pin 1 Ground (GND): Pin 2 K-Line (Communication): Pin 43
Some older variants may require "Boot Mode" (grounding a specific pin on the PCB) to write to the Flash memory. simos 33a pinout top