GM Tech2 Diagnostic Tool cable pinout.....

After what seemed like a decade of hard work....
I -finally- found the correct pinout for the RS232 to RJ45 cable that connects the tech2 to my PC

here is the full story :-)

Basically only three pins are really required; they are

 RS232 --  RJ45 

    2       --      4   

    3       --      5   

    5       --      7   

2,3,5 are the Receive, Send, Ground respectively..