First, CONNECT:   >  Download GuzziDiag for the operating system of your computer: [edit/May 2023: current version is GuzziDiag V0.60] http://www.von-der-salierburg.de/download/GuzziDiag/     >  Scroll down and download the correct FTDI Driver for a correct FTDI 232RL chipped OBDII>USB cable:     > Connect the 3-pin Diagnostic connector and power the 3-pin > OBD II adaptor with 12 volts through the red (+) and black ( - )