I have a 2002 A4 and the sympoms are windows won't work at all, interior light stays on, drivers side electric door lock will not function. Someone please help....

 

Feel your carpet on the driver's side and see if its wet, if it is the comfort control module might have gotten wet from a leak into the car. In which case you have to pull the carpet up and replace the module, then remove the battery and blow out the pleanum drain so it doesn't let water back into the vehicle.