VSS100 security system numeric keypad

Hey Everyone I have a GM Good Wrench Vehicle Security System 100 circa 1988. I have recently acquired the installation instructions but found the instructions for programing the 3 digit code were not included. Apparently it was a accessory module that was not part of the basic system. Does anyone know how to program the key pad? (looks just like a telephone key pad) Thanks a million. :confused:

I have found the installation instructions and wired it up. The unit works great!!