Its on the passenger side under the dash, should be mounted to a support bar or heater box case, should be a box about that's approx 4"x4"x2" Can be either black or a creamy white color. If you take out the glove box it makes it much easier to find.
Are you talking about the Pass Key code where the "chip" in the key either will or won't make it start????
If your looking for that... on my 89 Camaro RS it was in the drivers side kick panel *by where your hood releice is* Take that plastic panel off and pull away the sticky black/white patch of tape stuff there and it'll be inside there.
I just bypassed that key code deal right there.
Not sure if that's what your looking for ???