99 Saab 9-3 Windows, turn signals, heater & wipers quit working at once ??? on 1999 Saab 9-3

They all quit working at once and my starter is sticking was wondering if a relay our something controls all these things? Any help would be nice if anyone has ever experienced this problem or if anyone knows what would cause this I would appreciate the help

Asked by for the 1999 Saab 9-3
To many possibilities, needs to be tested.
Thanks for the response but will a computer be able to read what would be wrong with it?
It should! But it neefs to be a professional scanner!
So to the shop she goes that stinks was hoping a dash scanner would work thanks