Car computer

Js08016,has the correct answer,this is old school diagnostic before there was scanner,s, good answer Js.

I have a '95 supercharged Riviera and it has what is referred to as the OBD 1.5 system which is a OBD 1 computer with an OBD 2 connector/plug. Another poster said to jump pins 4 and 5, the top two middle pins, but it didn't do anything. Another poster also said to jump pins 4 and 6 but there is no pin in position 6 so another no go. I'm not sure where pins A and B are supposed to be but there's only one pin at the top right side of plug in this car and it's position 8, there is no pin in position 7.

Another view of the OBD 2 style plug.