Mazda Tribute 2005 alarm issue!

Just bought Mazda Tribute 2005 60000 miles.
The alarm remote locks and unlock and the panic button working.
Now when I lock w the remote then open from inside as i tested , the alarm doesn't' sound , why?
If i press the panic button it sounds just right ,means every things working good . Am i missing something or what? Is there any way to activate or deactivate or what ?? or it doesn't work like that ?? whats the deal??

I read the same issue at another website .

I recently purchased a 2005 Mazda Tribute.
Here's the problem, and what's I've done so far:
I press the LOCK button on the remote and the doors audibly lock.
I press the LOCK button a SECOND time and I hear a CHIRP indicating that the alarm is set.
However, if I leave a window open and open the door from outside with the alarm set, the alarm does not sound.
I've checked to make sure that it isn't just ONE door switch by trying this with all the door and the hatch, and the interior light does come on.

My GUESS is that there is a valet switch somewhere, to keep the alarm from blaring as it was going through a car wash. But I haven't found it and have read the manual from beginning to end.

Also, I pressed the panic alarm so that I'm sure the alarm itself is working.

Please someone help me out...
!!
That's same what i am experiencing !!