My -00 S80 T6 has been invaded by the electronic ghost!

This is what I've got:

1. No ignition when turning key to on pos, The whole cluster is dead, engine
does not start.
2. No head or tail lights, horn or whipers.
3. RH powerseat works fine with key on.
4. The little red lights on the front door edges stays on all the time, the rear ones are dead.
5. The stereo plays with the key on.
6. With key on, there is a humming from the engine compartment that
quits about 15 sec. after key is returned to off. (normal operation)

Could it be the Central Elecronics Module? If yes, where is it located
and what does it take to change it out. Software download?

Any help would be greatly appreciated.
/Thomas