1989 Cadillac Deville

First do this to check for codes, then when trying to reset stuff, remove the ground(-) negative cable, not the positive. Cross these two terminals as shown, then turn the key on. Count the flashes, a 22 will flash as 2 flashes then a short pause, then 2 flashes, if more than one code is stored, the pause will be longer. The codes will display three times and end with 12. Write them down and post here. This connector is right under the middle of the dash...