Need to read the codes
 

I have been trying to read the codes from my ALDL connector, and I am not having any luck. I have checked the old posts on this site and read the haynes manual, and nothing is working. My ALDL connector when I jump pin A & B with the ignition switch on does not flas with a code. In the haynes manual, it says to jump pin H with pin A. In my pin H there is no wire.
Could some one help me on how to get the codes? I have a 92 Sedan Deville with 4.9 auto.