Not sure if this will be useful for others but I couldn't find anything on the pin out for the B plug when I was using an obd2a EX automatic harness for my 98 EK b16a2 swap with a chipped p28, so thought I leave this info here so others can search for it as well if needed. Most of the info that I found out there were for manual harnesses. The B plug pin out is specifically used for the automatic transmission solenoids/sensors. Sorry if this has been discussed prior already. Just trying to help others out there as well!

Info is from Identifix.