Interior lights stay and alarm goes off every time i lock it

Your car thinks a door is open , thus the light stays on. When you lock the doors with the remote it activates the alarm system. 10 sec later it senses that the a door is open and alarm sounds.
I have a 99 passat as well and I just went outside to see where the switch on the door is. Can't see one anywhere , it must be inside the door (part of the latch mechanism). I tried to arm the alarm system by locking the doors with the remote while the door was still open , sure enough the alarm went off about 15 secs later.