My problem is i just recently bought this 1990 Lexus LS400 andeverything works fine but randomly the alarm will start going off wheni open the trunk or doors then i put the key in the ignition and itwill stop but it wont start. Then randomly will start a day or 2 later.All i have is a key with a unlock and lock button on it. I just want toremove or disengage the alarm forever if i could

Yer right,,,its a dam lexus??? there nothing but problems when they go wrong,,, not that they go wrong often, but when they do??????
i realy cant think of a way you could do what you wont to do,,,,, but i can think of a way to put it right, take it into the lexus dealer they will fix the alarm for you,,,only one thing that springs to mind is when did you last change the kye fob batterys?????
however when you do change them do it very very fast,, or you lose the coad for the alarm???
then it wont go at all,,, its a lexus!!! yuck!