Get a pen and paper. Do morris code style. First few super fast flashes dont count. Then make a dash on paper for each blink, then look at paper and write numbers. You can stop writing once you realize it is repeating the same flashes over and over. Or you can by a code reader for a few bucks off amazon.
I have a scanner thats able to read ob1, just lost the adapter... just ordered one so hopefully that'll work and maybe even show some live data. I know it does on ob2.