The Bosch M7.9.7 typically uses an 81-pin black connector. Below are the essential pins you'll need for basic power-up and communication: Pins 12, 44, 63 : Constant +12V Power Supply Pin 13 : Ignition Switch (+12V to simulate "Key On") Pins 51, 53 : Ground (-) Communication:
, identifying the "+" version is critical. Although both look the same on the outside and share the same label, the "+" version typically requires no internal hardware modification for "open mode" writing, whereas older versions may need a resistor moved from position "1" to "2" on the board to enable programming. for a specific vehicle brand, such as Bosch M 7.9.7 ECU Pinout Guide | PDF - Scribd bosch m797 pinout better