Car Alarms: 1995 Toyota Camry Alarm, valet mode, toyota camry

Question
I had just installed an aftermarket radio and had to disconnect the negative lead on the battery in turn. With that after I finished installation, the alarm goes off as soon as I put the cable back on battery. It is a 1995 Camry LE. I'm not sure if it's aftermarket or factory. It's a siren-ish alarm but headlights do not flash. I have tried locking and unlocking door with key and used the remote as well, neither shut off alarm. Unfortunately, I didn't think that such a situation would happen and I have the car parked outside. Of course, this would be extremely rude to our neighbors if I let it run on. What are my options, preferably one that is quick and does not let the alarm run on? Thank you

Answer
Ok, should be fairly easy. To try to disarm it,
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. Once in Valet mode,
it will allow the car to start and operate
like there was no alarm at all.

That should solve the troubles for now.
Repeat the steps to toggle back to valet when needed.

Let me know what you discover.

ALARMTEK
WWW.CARALARMMAN.COM