Jason S wrote
I believe the bleeper is in the centre console just under the radio. You'll see a rectangle shape made up of square dots. That's where the b*stard hides! 
Nope, that is the inlet for the cabin air temperature sensor, which has a little fan drawing air over it - part of the climate control setup.
The warning beeper is attached to the dashboard printed circuit, buried deep in the dash.  Don't know of any way to change its volume short of putting a sock in it.  It is supposed to be noticable, after all.
The indicator noise is mechanical, comes from the relay itself.