My first guess is going to be that GM refers to it as a "chime", seems I've seen that word in the past when referencing things like that, and most of my experience would be with GM. My second guess is that it's going to be under the dash somewhere, driver side and is probably just wired into a circuit that closes while the key is in the ignition and any door is opened. Aside from the resistor pellet in the key themselves, the ignition was still pretty simple in these cars compared to modern cars. I highly doubt that there's any involvement from any computers, except maybe the Fleetwood since the CCM in that car has its fingers into everything. I may peruse my shop manual and see if I can find any more detailed info on where it is.
EDIT: I found some relevant info, give me a few minutes to upload some pics for you.
Last edited by schlicky13; 09-16-2017 at 11:40 PM.