Usually a loose ground on the alarm causes the siren to go off very mellow. As far as the door looks, it could be because of the loose ground on the alarm, or the ignition wire on the alarm isn't on securely. I'd try those first. Let me know if you need any other help.
I will check those now, Thanks! I just replaced my battery terminals (so that's not the problem). I figured out something else though which may be pretty easy to diagnose, if it's not what you have already told me to check. It seems when the door is opened and I "arm" the alarm, the alarm system seems fine. Its then when the door is closed the siren/alarm gets triggered and its very mellow like you said and the volume of the alarm/siren gets soft and then a little louder and then soft again and alternates. So it's kind of working opposite of what it should be; door open alarm armed/operation normal, door closed alarm armed/ very mellow alarm. Thanks alot for the help. I have a feeling I'm going to need it. If that helps you to further diagnose it please let me know.
I finally found the problem, it was a loose ground wire for the alarm. Everything is back to normal. Does anyone know how to disable the factory lexus alarm. Thanks again.
I believe you can disarm the factory alarm by inserting the key in the drivers door and unlocking. Im glad you found the problem. Its funny that you mentioned how the alarm was acting, I actually had someone come in with the same problem, whoever had installed the alarm previously grounded the the alarm on the door pin. Funny stuff.