P306 courtesy light problem

Hello!

I have a P306 estate (break) HDI from year 2000.

Front courtesy (interior) light, the one which turns on when doors are
open, is always on...I see no switches on doors, so I was wondering
how is it solved, via central locking unit or?

About the same time when that problem came out, also, when I lock the
car with remote locking, the direction light signal doesn't "signal"
no more...i.e. when opening car with remote control the direction
light start to blink, and when you lock the car with remote, direction
light go on for 1 or 2 second...it's the right way...now, only when I
open the car direction light blink...

Also, my rear courtesy light doesn't work, I'm guessing the problem is
also with "door switch"...

Did anyone have similar problem(s) and how did You solve it?
Any schematic diagram would be appreciated...

Thank a lot in advance...
Ernesto