Small silver box with 2-wire connector attached to a cross piece of the support frame behind the center console. It may be the lighter socket thermal fuse, or something similar. The pics below are view toward the front, and second pic is looking at the back of the frame after removal. It is not a relay (and the black lighter relay can be seen in the second pic)
Hard to tell, but kind of looks like 21 & 24 http://www.acuraoemparts.com/delray/jsp/prddisplay.jsp?inputstate=5&catcgry1=INTEGRA&catcgry2=1992&catcgry3=3DR+LS&catcgry4=KL5MT&catcgry5=FUSE%2BBOX%2B-%2BRELAY&ListAll=All&vinsrch=no
I have looked at that diagram too - had that in hand when I started pulling the dash apart. It is definitely not 24, and probably not a relay. 24 was identifiable by the part number printed on the side, but the one I have circled, is metal, with no identifiable marks.
This is the first time I have taken a close look at the electricals, so I am still trying to figure everything out.
If it IS the chime, then it will be easy to test, just apply 12V, and listen, right? 