1997 4wd Swtich Issue - Need Codes

Hello, Guys... I need help please. My 4x4 switch was not working. bought another one off ebay and still no work (no lights at all). I found fuse 2 blown (tcase) and replaced. Now the switch (both) will light up for 2-3 seconds after key turned on, but then off and nothing else. I removed the Pos lead on battery for several minutes, cleaned terminals and reconnected. I also removed fuse 2 for several minutes, cylced key on and off 5 times, and then started car, still nothing.

I searched here and found on the tahoe boards that I could ground pin 13 on the OBD2 connector turn ignition on and read the codes that way for the DTC. I am getting 2 flashes. The link someone had posted last year with the translation of the flashes is a dead link now. Can anyone tell me what I ahve now?

Thank you...