I was wondering if anyone else had come across this problem

Today I have noticed that my 2001 A4 B6 Avant has developed a whole bunch of electrical problems

1. The dash display doesn't recognise when either the drivers door or RHS rear door is open,
2. The interior lights no longer come on when these doors are open,
3. The courtesy lights on the doors of footwells don't work,
4. The car locks and unlocks when you turn the ignition on,
5. There is no audiable tone to let you know you've left the headlights on
6. If you try locking the car with the door open all the lights that have stopped working then flash rather then the indicators flashing externally !!

On a brighter note, the left side of the car works fine

Any suggestions please guys?