Join Date: Dec 2005
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Hello and welcome to the forum.
For all of that to fail at the same time,it has to be a wiring or relay fault somewhere.The wiring under the bonnet does have a tendency to corrode and cause strange faults.I'd start by checking all the earthing points,and work your way through the wiring and the relay boxes.Any signs of greening of connections,then thats always a give away sign.The wires can corrode and break inside of the insulation,so try pulling the wires to see if they break.
It does sound like a bit of a nightmare,but with patience(well,a lot of patience...
) I suspect you'll find the problem eventually.
I'd rather push my Alfa than drive a BMW....
Currently in Lagdti's garage:
2004 Saab 9-5 HOT Aero and a 2001 Audi A3 1.8 Turbo