Hi, Mike; If you can find the in-line fuse, try disconnecting it. I hate after-market alarm systems. You will need a wiring diagram for the system to get to the bottom of the problem.
If you have a Best Buy or Car Toys store near you, they specialize in these. Maybe be able to disarm it for you?
I am having an issue with Toyota Corolla 2003 LE alarm. The car alarm goes off when I open the door in the car. The car will not start when I turn the key in the ignition. There was an aftermarket car alarm installed in the car before I purchased it.
Look at this first 50 seconds of this video and I'm having the same issues up to that point:
When the issue first started a few days ago, I was able to start the car by turning the key in the ignition and pushing a (Valet?) switch under the steering wheel. See this video for what I did:
That method doesn't seem to be working anymore. How can shut off my car alarm?
Here are some pics of my car:
Inside the hood: