Car Alarms: Need to disarm car alarm, valet mode, toyota corolla

Question
I own a 2000 Toyota Corolla with aftermarket car alarm.  I don't know the exact model but I believe it's an Audiovox APS400, APS500 or APS600.  It has the boomerang shaped FOB with FCC# ELVAT5G.  The problem started when my wife tried to use the key FOB to open the car and it wouldn't.  She used the key to open the driver side door and the alarm got armed (headlights flashing, horn blaring and some dashboard indicator lights flashing).  We had the vehicle towed to a shop where they diconnected the battery.  When I got there to take a look, they reconnected the battery and the car horn started blaring, and the lights flashed, etc.  So how do I disarm the alarm system at this point?  Thank you.  

Answer
To try to disarm it, locate and use the
valet/overide switch.

To start, look under the dash area for a button or,
a toggle switch. When you locate it, turn on the
ignition key, press and hold in the button (little
spring loaded micro button, red or black possibly)
until the alarm chirps 1 time. This should over ride
the system, and only the keyless entry part,
if installed, would still be operating.
The LED (light emiting diode) light in the dash
should also go on solid.=VALET/OVERIDE

This stops the alarm except for the keyless
entry if installed. The next step is to
either remove the alarm or, try to identify,
and get new remotes for it.

But once in Valet mode, it will allow the car
to start and operate like there was no
alarm at all. Repeat steps to put into user
mode.

Let me know how it goes.

ALARMTEK
CARALARMMAN.COM