E36 alarm

The car is 96 bmw 328i.It has keyles entry and alarm.Can somebody tell me how to disable alarm so i can use keyles entry only.I want to do this because sometimes at night alarm goes off by itself( nobody is trying to break into it for sure).It happen already couple of times but mostly over night.From what i heard there is a some kind of switch under steering wheel but i cant find it.
Another problem that i have is during driving my interior lights turn on and sometimes it wont let me lock the doors at all.If anybody knows how to fix any of this i would appriciate it if they responde to this.
Sorry for spelling , english is not my first language