Okay here is yet another update as the drive last night corrected my belief as to which lights are working. The following lights DO NOT work:

Centre Vent
Headlamp switch
Shift Console
All Window Switches (Console AND Rear Seats)
Headrest Retractor Switch
Rear Seat Light Switch (on centre Console)
Antenna Switch

From what I know all the switches have built-in LEDs which means that they will probably NEVER blow. Which leaves the Centre Vent and the Headlamp Switch as the only two of these with bulbs that can be changed.

My question is can a blown bulb be the reason that the rest of the lights above have gone out? I know that the centre vent is tough to access so I would rather not go in unless I have to.

As a side note it seems as though my buzzer is going south. If the AC/Heater blower is active when I turn the key the buzzer changes pitch from normal to low as if someone is choking it. If the heater is not on the buzzer is fine. All this seems to indicate to me that there must be a bad ground somewhere. Correct me if I'm wrong.

Man I need a wiring diagram.