Need some help here..

On the B52 how does one find the button that turns on the nav ILS tone? It works when I start the session with a CS727 and then change to the B52 and it works then also.. but when I come in cold and fly.. then set up for landing.. I can't find or figure out
how to turn the tone on so I can hear it.. Any help? Would of course be appreciated.. Thanks

Coosbay2
Coosbayhops.com
:D