Car Alarms: Factory Alarm Not Chirping when set, chev aveo, valet mode

Question
I have a 2004 Chev. Aveo. I took it in for a routine oil change yesterday and now when I lock the car with the key fob it no longer "Chirps".  i can not find my owner's manual.  I assume the mechanic just overrode it somehow, but he swears he didn't do anything, and i have no clue as to how to reset it.  Any suggestions or instructions would be much appreciated!!!

Answer
Should be no problem really.
It appears from your expaination, that the
after market car alarm is in service mode.

Ok, try this.
Put the key in the ignition, and turn forward
all the way just before cranking. Then within
5 seconds, press and hold in the valet/overide
button, found under the dash area, usually to the
left of the leg drilled into a hidden away spot,
until the installed LED (the blinking light)
in your dash area goes off, and the siren chirps twice.
(Your valet switch might be the toggle (on/off) type.
in this case, key on, flip switch in oposite direction,
key off.)

This should reset the alarm.

Just Repeat these steps to place it
back to valet mode.

That should do it.
Let me know what happens.

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