help with sopmething simple

the car isn't a cavy, but i hope you guys can help. buddy has a 93 lumina with a 3.1....problem is i don't remember what pins to short out to read codes. anyone remember?

A and B. Both on the top row, the two farthest to the right.

sweet, thanks bro. bonafide brain fart....haven't had to do that fro some time.