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Hello, my name is ***** ***** I am a professional here at Just Answer. I have noticed that your question was not getting a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.Unfortunately no, the alarm system on your 1999 S80 can not be disabled. Can you scan the system and see if there are any fault codes setting and I will try and help you determine why its seems to be failing if it is the alarm causing the no start..
Unfortunately I can not tell you what is not available. They are correct, the system can not be disabled and or by passed just as your dealer has stated. Sorry I could not be more useful.