X5 E53 problem

[rednsx3]

Hi,
I am having trouble with my 2002 X5 E53 RHD model with sport package.

My headlight is always on and it switches off only when I switch off the engine and remove the key.
The lights are on all the time and the light control switch is not working. The light is on low beam and no lighting on/off controls are working in the car. The indicator lights , number plate lights and instrument cluster lights etc are also not working.

Also, the instrument cluster is not displaying information like the door opening or the headlight remaining on.
What could be the problem?? I think the light control module is not working. But there is something else also which is not working properly. Which part could it possibly be?